Some Basic Concepts of Chemistry

224 questions · Chemistry · JEE Main

Some Basic Concepts of Chemistry

224 questions · Chemistry · JEE Main

On complete combustion 1.0 g of an organic compound $(X)$ gave 1.46 g of $CO_{2}$ and 0.567 g of $H_{2} O$ . The empirical formula mass of compound $(X)$ is g. (Given molar…2025 · 2 Apr · Shift 1 · Q10 · MCQ
$CaCO_{3} (s) + 2 HCl (aq) \to CaCl_{2} (aq) + CO_{2} (g) + H_{2} O (l)$ Consider the above reaction, what mass of $CaCl_{2}$ will be formed…2025 · 2 Apr · Shift 1 · Q2 · MCQ
Among $1 0^{- 9} g$ (each) of the following elements, which one will have the highest number of atoms? Element: $Pb, Po, Pr$ and Pt2025 · 3 Apr · Shift 1 · Q14 · MCQ
$During estimation of nitrogen by Dumas’ method of compound X (0.42 g)$ mL of $N_{2}$ gas will be liberated at STP. (nearest integer) (Given molar mass in $g mol^{- 1} : C : 12, H : 1, N : 14$ … Includes diagram2025 · 3 Apr · Shift 1 · Q21 · Numerical
0.5 g of an organic compound on combustion gave 1.46 g of $CO_{2}$ and 0.9 g of $H_{2} O$ . The percentage of carbon in the compound is . (Nearest integer) [Given : Molar mass (in $g mol^{- 1}) C : 12, H : 1, O : 16$ …2025 · 3 Apr · Shift 1 · Q23 · Numerical
In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound is (Given : Aqueous tension at $300 K = 15 mm Hg$ …2025 · 3 Apr · Shift 2 · Q20 · MCQ
X g of nitrobenzene on nitration gave 4.2 g of m -dinitrobenzene. X = g. (nearest integer) [Given : molar mass (in $g mol^{- 1}) C : 12, H : 1, O : 16, N : 14]$ …2025 · 3 Apr · Shift 2 · Q21 · Numerical
Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given: Molar mass of Mg is $24 g mol^{- 1}$ .2025 · 3 Apr · Shift 2 · Q4 · MCQ
10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl and made the volume upto the mark with distilled water. The…2025 · 3 Apr · Shift 2 · Q7 · MCQ
Fortification of food with iron is done using $FeSO_{4} \cdot 7 H_{2} O$ . The mass in grams of the $FeSO_{4}$ . $7 H_{2} O$ required to achieve 12 ppm of iron in 150 kg of wheat is …2025 · 4 Apr · Shift 1 · Q23 · Numerical
The amount of calcium oxide produced on heating 150 kg limestone ( $75%$ pure) is kg. (Nearest integer) Given: Molar mass (in $g mol^{- 1}$ ) of $C a$ -40, $O$ -16, $C$ -122025 · 4 Apr · Shift 2 · Q22 · Numerical
An organic compound weighing 500 mg , produced 220 mg of $CO_{2}$ , on complete combustion. The percentage composition of carbon in the compound is $%$ . (nearest integer) (Given molar mass in $g mol^{- 1}$ …2025 · 7 Apr · Shift 1 · Q21 · Numerical
Thyroxine, the hormone has given below structure The percentage of iodine in thyroxine is %. (nearest integer) (Given molar mass in $g mol^{- 1} C : 12, H : 1, O : 16, N : 14, I : 127$ … Includes diagram2025 · 7 Apr · Shift 1 · Q25 · Numerical
Butane reacts with oxygen to produce carbon dioxide and water following the equation given below. $C_{4} H_{10} (g) + \frac{13}{2} O_{2} (g) \to 4 CO_{2} (g) + 5 H_{2} O (l)$ …2025 · 7 Apr · Shift 2 · Q22 · Numerical
20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of the sodium iodide solution is M. (Nearest Integer value) (Given : Na = 23, I = 127,…2025 · 8 Apr · Shift 2 · Q24 · Numerical
On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g $H_{2} O$ and 0.307 g $C O_{2}$ . The percentages of hydrogen and oxygen in the given organic compound respectively are:2025 · 8 Apr · Shift 2 · Q9 · MCQ
Density of 3 M NaCl solution is $1.25 g / mL$ . The molality of the solution is :2025 · 22 Jan · Shift 2 · Q10 · MCQ
20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is $\times 1 0^{- 2} M$ . (Nearest integer)2025 · 22 Jan · Shift 2 · Q24 · Numerical
$2.8 \times 1 0^{- 3} mol$ of $CO_{2}$ is left after removing $1 0^{21}$ molecules from its ' $x$ ' mg sample. The mass of $CO_{2}$ taken initially is Given: $N_{A} = 6.02 \times 1 0^{23} mol^{- 1}$ …2025 · 23 Jan · Shift 1 · Q11 · MCQ
During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is %. (Given molar mass in $g mol^{- 1}$ of $Ba : 137, S : 32, O : 16$ …2025 · 23 Jan · Shift 1 · Q25 · Numerical
0.01 mole of an organic compound $(X)$ containing $10%$ hydrogen, on complete combustion produced $0.9 g H_{2} O$ . Molar mass of $(X)$ is $g mol^{- 1}$ .2025 · 23 Jan · Shift 2 · Q21 · Numerical
When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is . (Nearest integer) Given : Molar mass of Al is $27.0 g mol^{- 1}$ …2025 · 23 Jan · Shift 2 · Q23 · Numerical
Consider the following reaction occurring in the blast furnace: $Fe_{3} O_{4 (s)} + 4 CO_{(g)} \to 3 Fe_{(l)} + 4 CO_{2 (g)}$ ' $x$ ' kg of iron is produced…2025 · 24 Jan · Shift 1 · Q23 · Numerical
Xg of benzoic acid on reaction with aq $NaHCO_{3}$ released $CO_{2}$ that occupied 11.2 L volume at STP. X is g.2025 · 24 Jan · Shift 1 · Q24 · Numerical
The elemental composition of a compound is $54.2% C, 9.2% H$ and $36.6% O$ . If the molar mass of the compound is $132 g mol^{- 1}$ , the molecular formula of the compound is : [Given : The…2025 · 24 Jan · Shift 2 · Q6 · MCQ
The molarity of a $70%$ (mass/mass) aqueous solution of a monobasic acid (X) is $\times 1 0^{- 1}$ M (Nearest integer) [Given: Density of aqueous solution of (X) is $1.25 g mL^{- 1}$ Molar mass…2025 · 28 Jan · Shift 1 · Q23 · Numerical
Quantitative analysis of an organic compound (X) shows following % composition. C : $14.5%$ Cl : 64.46% H: 1.8 % (Empirical formula mass of the compound $(X)$ is $\times 1 0^{- 1}$ (Given molar mass in $g mol^{- 1}$ …2025 · 28 Jan · Shift 1 · Q25 · Numerical
Concentrated nitric acid is labelled as $75%$ by mass. The volume in mL of the solution which contains 30 g of nitric acid is . Given : Density of nitric acid solution is $1.25 g / mL$ .2025 · 28 Jan · Shift 2 · Q19 · MCQ
Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is the force exerted by gravity on an object. (C) Volume is the amount of space occupied by a substance. (D) Temperatures below 0°C…2025 · 29 Jan · Shift 1 · Q11 · MCQ
Consider the following reaction : $3 PbCl_{2} + 2 (NH_{4})_{3} PO_{4} \to Pb_{3} (PO_{4})_{2} + 6 NH_{4} Cl$ If $72 mmol$ of $PbCl_{2}$ is mixed with…2024 · 1 Feb · Shift 1 · Q25 · Numerical
$10 mL$ of gaseous hydrocarbon on combustion gives $40 mL$ of $CO_{2} (g)$ and $50 mL$ of water vapour. Total number of carbon and hydrogen atoms in the hydrocarbon is…2024 · 1 Feb · Shift 2 · Q30 · Numerical
The Molarity (M) of an aqueous solution containing $5.85 g$ of $NaCl$ in $500 mL$ water is : (Given : Molar Mass $Na : 23$ and $Cl : 35.5 gmol^{- 1}$ )2024 · 4 Apr · Shift 1 · Q13 · MCQ
$Xg$ of ethylamine is subjected to reaction with $NaNO_{2} / HCl$ followed by water; evolved dinitrogen gas which occupied $2.24 L$ volume at STP. X is $\times 1 0^{- 1} g$ …2024 · 4 Apr · Shift 1 · Q25 · Numerical
From $6.55 g$ of aniline, the maximum amount of acetanilide that can be prepared will be $\times 1 0^{- 1} g$ .2024 · 4 Apr · Shift 2 · Q24 · Numerical
An organic compound has $42.1%$ carbon, $6.4%$ hydrogen and remainder is oxygen. If its molecular weight is 342 , then its molecular formula is :2024 · 5 Apr · Shift 1 · Q10 · MCQ
The number of moles of methane required to produce $11 g CO_{2} (g)$ after complete combustion is : (Given molar mass of methane in $g mol^{- 1} : 16$ )2024 · 5 Apr · Shift 2 · Q16 · MCQ
The density of ' $x$ ' $M$ solution (' $x$ ' molar) of $NaOH$ is $1.12 g mL^{- 1}$ , while in molality, the concentration of the solution is $3 m$ ( 3 molal). Then $x$ is (Given : Molar mass of $NaOH$ …2024 · 6 Apr · Shift 1 · Q10 · MCQ
Molality $(m)$ of $3 M$ aqueous solution of $NaCl$ is : (Given : Density of solution $= 1.25 g mL^{- 1}$ , Molar mass in $g mol^{- 1} : Na - 23, Cl - 35.5$ )2024 · 6 Apr · Shift 2 · Q12 · MCQ
Combustion of glucose $(C_{6} H_{12} O_{6})$ produces $CO_{2}$ and water. The amount of oxygen (in $g$ ) required for the complete combustion of $900 g$ of glucose is : [Molar mass of glucose…2024 · 8 Apr · Shift 1 · Q1 · MCQ
A solution is prepared by adding 1 mole ethyl alcohol in 9 mole water. The mass percent of solute in the solution is (Integer answer) (Given : Molar mass in $g mol^{- 1}$ Ethyl alcohol : 46…2024 · 8 Apr · Shift 2 · Q27 · Numerical
Molality of an aqueous solution of urea is $4.44 m$ . Mole fraction of urea in solution is $x \times 1 0^{- 3}$ , Value of $x$ is . (Integer answer)2024 · 8 Apr · Shift 2 · Q28 · Numerical
Molarity $(M)$ of an aqueous solution containing $x g$ of anhyd. $CuSO_{4}$ in $500 mL$ solution at $3 2^{\circ} C$ is $2 \times 1 0^{- 1} M$ . Its molality will be $\times 1 0^{- 3} m$ …2024 · 9 Apr · Shift 1 · Q30 · Numerical
Mass of methane required to produce $22 g$ of $CO_{2}$ after complete combustion is g. (Given Molar mass in g mol-1 $C = 12.0$ , $H = 1.0$ , $O = 16.0)$ 2024 · 27 Jan · Shift 1 · Q23 · Numerical
The quantity which changes with temperature is :2024 · 27 Jan · Shift 2 · Q19 · MCQ
$9.3 g$ of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the reaction is $100%$ completed is $\times 1 0^{- 1} g$ .…2024 · 27 Jan · Shift 2 · Q27 · Numerical
Volume of $3 M NaOH$ (formula weight $40 g mol^{- 1}$ ) which can be prepared from $84 g$ of $NaOH$ is $\times 1 0^{- 1} dm^{3}$ .2024 · 27 Jan · Shift 2 · Q28 · Numerical
A solution of $H_{2} SO_{4}$ is $31.4% H_{2} SO_{4}$ by mass and has a density of $1.25 g / mL$ . The molarity of the $H_{2} SO_{4}$ solution is $M$ …2024 · 29 Jan · Shift 1 · Q22 · Numerical
If $50 mL$ of $0.5 M$ oxalic acid is required to neutralise $25 mL$ of $NaOH$ solution, the amount of $NaOH$ in $50 mL$ of given $NaOH$ solution is…2024 · 29 Jan · Shift 2 · Q23 · Numerical
Molality of 0.8 M H $_{2}$ SO $_{4}$ solution (density 1.06 g cm $^{- 3}$ ) is $\times 1 0^{- 3}$ m.2024 · 29 Jan · Shift 2 · Q30 · Numerical
The mass of sodium acetate $(CH_{3} COONa)$ required to prepare $250 mL$ of $0.35 M$ aqueous solution is g. (Molar mass of $CH_{3} COONa$ is $82.02 g mol^{- 1}$ …2024 · 30 Jan · Shift 1 · Q22 · Numerical
$0.05 cm$ thick coating of silver is deposited on a plate of $0.05 m^{2}$ area. The number of silver atoms deposited on plate are $\times 1 0^{23}$ . (At mass $Ag = 108, d = 7.9 g cm^{- 3}$ …2024 · 30 Jan · Shift 1 · Q23 · Numerical
If a substance ' $A$ ' dissolves in solution of a mixture of ' $B$ ' and ' $C$ ' with their respective number of moles as $n_{A}, n_{B}$ and $n_{C_{3}}$ . Mole fraction of $C$ in the…2024 · 30 Jan · Shift 2 · Q8 · MCQ
Number of moles of methane required to produce $22 g CO_{2 (g)}$ after combustion is $x \times 1 0^{- 2}$ moles. The value of $x$ is .2024 · 31 Jan · Shift 1 · Q27 · Numerical
Molar mass of the salt from $NaBr, NaNO_{3}, KI$ and $CaF_{2}$ which does not evolve coloured vapours on heating with concentrated $H_{2} SO_{4}$ is $g mol^{- 1}$ …2024 · 31 Jan · Shift 1 · Q28 · Numerical
A sample of $CaCO_{3}$ and $MgCO_{3}$ weighed $2.21 g$ is ignited to constant weight of $1.152 g$ . The composition of mixture is : (Given molar mass in $g mol^{- 1} CaCO_{3} : 100, MgCO_{3} : 84$ …2024 · 31 Jan · Shift 2 · Q20 · MCQ
The molarity of $1 L$ orthophosphoric acid $(H_{3} PO_{4})$ having $70%$ purity by weight (specific gravity $1.54 g cm^{- 3}$ ) is $M$ . (Molar mass…2024 · 31 Jan · Shift 2 · Q29 · Numerical
The density of $3 M$ solution of $NaCl$ is $1.0 g mL^{- 1}$ . Molality of the solution is $\times 1 0^{- 2} m$ . (Nearest integer). Given: Molar mass of $Na$ and $Cl$ …2023 · 1 Feb · Shift 1 · Q21 · Numerical
The molality of a $10% (v / v)$ solution of di-bromine solution in $CCl_{4}$ (carbon tetrachloride) is ' $x$ '. $x =$ $\times 1 0^{- 2} M$ . (Nearest integer) [Given : molar mass of $Br_{2} = 160 g mol^{- 1}$ …2023 · 1 Feb · Shift 2 · Q21 · Numerical
If 5 moles of $BaCl_{2}$ is mixed with 2 moles of $Na_{3} PO_{4}$ , the maximum number of moles of $Ba_{3} (PO_{4})_{2}$ formed is (Nearest integer)2023 · 6 Apr · Shift 1 · Q21 · Numerical
The volume of $0.02 M$ aqueous $HBr$ required to neutralize $10.0 mL$ of $0.01 M$ aqueous $Ba (OH)_{2}$ is (Assume complete neutralization)2023 · 6 Apr · Shift 2 · Q15 · MCQ
$0.5 g$ of an organic compound $(X)$ with $60%$ carbon will produce $\times 1 0^{- 1} g$ of $CO_{2}$ on complete combustion.2023 · 8 Apr · Shift 1 · Q17 · Numerical
The number of molecules and moles in 2.8375 litres of O $_{2}$ at STP are respectively2023 · 10 Apr · Shift 1 · Q2 · MCQ
Match List I with List II Choose the correct answer from the options given below: Includes table2023 · 10 Apr · Shift 2 · Q11 · MCQ
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$ Assertion A : $3.1500 g$ of hydrated oxalic acid dissolved in water to make $250.0 mL$ solution…2023 · 10 Apr · Shift 2 · Q5 · MCQ
A solution of sugar is obtained by mixing $200 g$ of its $25%$ solution and $500 g$ of its $40%$ solution (both by mass). The mass percentage of the resulting sugar solution is (Nearest…2023 · 11 Apr · Shift 1 · Q16 · Numerical
The volume of hydrogen liberated at STP by treating $2.4 g$ of magnesium with excess of hydrochloric acid is $\times 1 0^{- 2} L$ Given : Molar volume of gas is $22.4 L$ at STP. Molar…2023 · 11 Apr · Shift 2 · Q22 · Numerical
A solution is prepared by adding $2 g$ of " $X$ " to 1 mole of water. Mass percent of " $X$ " in the solution is :2023 · 11 Apr · Shift 2 · Q9 · MCQ
A metal chloride contains $55.0%$ of chlorine by weight . $100 mL$ vapours of the metal chloride at STP weigh $0.57 g$ . The molecular formula of the metal chloride is (Given: Atomic mass of chlorine is $35.5 u$ …2023 · 12 Apr · Shift 1 · Q7 · MCQ
An organic compound gives $0.220 g$ of $CO_{2}$ and $0.126 g$ of $H_{2} O$ on complete combustion. If the $%$ of carbon is 24 then the $%$ of hydrogen is $\times 1 0^{- 1}$ …2023 · 13 Apr · Shift 1 · Q15 · Numerical
$20 mL$ of calcium hydroxide was consumed when it was reacted with $10 mL$ of unknown solution of $H_{2} SO_{4}$ . Also $20 mL$ standard solution of $0.5 M HCl$ containing…2023 · 13 Apr · Shift 1 · Q18 · Numerical
$1 g$ of a carbonate $(M_{2} CO_{3})$ on treatment with excess $HCl$ produces $0.01 mol$ of $CO_{2}$ . The molar mass of $M_{2} CO_{3}$ is …2023 · 13 Apr · Shift 2 · Q16 · Numerical
The volume (in $mL$ ) of $0.1 M AgNO_{3}$ required for complete precipitation of chloride ions present in $20 mL$ of $0.01 M$ solution of $[Cr (H_{2} O)_{5} Cl] Cl_{2}$ …2023 · 15 Apr · Shift 1 · Q16 · Numerical
When $F e_{0.93} O$ is heated in presence of oxygen, it converts to $F e_{2} O_{3}$ . The number of correct statement/s from the following is A. The equivalent weight of $F e_{0.93} O$ is $\frac{Molecular weight}{0.79}$ …2023 · 24 Jan · Shift 1 · Q15 · Numerical
5 g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution. What volume (in mL) of this solution would be required to prepare 500 mL of 0.1 M solution? Given : Molar Mass of Na, O and H is…2023 · 24 Jan · Shift 1 · Q16 · Numerical
The number of units, which are used to express concentration of solutions from the following is Mass percent, Mole, Mole fraction, Molarity, ppm, Molality2023 · 24 Jan · Shift 2 · Q20 · Numerical
In sulphur estimation, 0.471 g of an organic compound gave 1.4439 g of barium sulphate. The percentage of sulphur in the compound is (Nearest Integer) (Given : Atomic mass Ba: 137 u, S: 32 u, O: 16 u)2023 · 25 Jan · Shift 1 · Q18 · Numerical
'25 volume' hydrogen peroxide means2023 · 25 Jan · Shift 1 · Q8 · MCQ
Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is (Given : Molar mass of A = 84 g mol $^{- 1}$ )2023 · 25 Jan · Shift 2 · Q21 · Numerical
What is the mass ratio of ethylene glycol ( $C_{2} H_{6} O_{2}$ , molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution?2023 · 25 Jan · Shift 2 · Q4 · MCQ
The volume of HCl, containing 73 g L $^{- 1}$ , required to completely neutralise NaOH obtained by reacting 0.69 g of metallic sodium with water, is mL. (Nearest Integer) (Given : molar masses of Na, Cl, O, H, are…2023 · 29 Jan · Shift 2 · Q16 · Numerical
When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of CO $_{2}$ was produced. The molar mass of compound is g mol $^{- 1}$ (Nearest integer).2023 · 29 Jan · Shift 2 · Q20 · Numerical
When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?2023 · 29 Jan · Shift 2 · Q6 · MCQ
Some amount of dichloromethane $(CH_{2} Cl_{2})$ is added to $671.141 mL$ of chloroform $(CHCl_{3})$ to prepare $2.6 \times 1 0^{- 3} M$ solution of $CH_{2} Cl_{2} (DCM)$ …2023 · 30 Jan · Shift 1 · Q14 · Numerical
$1 L, 0.02 M$ solution of $[Co (NH_{3})_{5} SO_{4}]$ Br is mixed with $1 L, 0.02 M$ solution of $[Co (NH_{3})_{5} Br] SO_{4}$ …2023 · 30 Jan · Shift 2 · Q13 · MCQ
The strength of 50 volume solution of hydrogen peroxide is $g / L$ (Nearest integer). Given: Molar mass of $H_{2} O_{2}$ is $34 g mol^{- 1}$ Molar volume of gas…2023 · 30 Jan · Shift 2 · Q15 · Numerical
Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of $11.5 g$ of zinc with excess $HCl$ is L (Nearest integer)…2023 · 31 Jan · Shift 1 · Q16 · Numerical
On complete combustion, $0.492 g$ of an organic compound gave $0.792 g$ of $CO_{2}$ . The % of carbon in the organic compound is (Nearest integer)2023 · 31 Jan · Shift 1 · Q19 · Numerical
When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of $A$ ?2023 · 31 Jan · Shift 2 · Q1 · MCQ
Assume carbon burns according to the following equation : $2 C_{(s)} + O_{2 (g)} \to 2 CO (g)$ when $12 g$ carbon is burnt in $48 g$ of oxygen, the volume of…2023 · 31 Jan · Shift 2 · Q14 · Numerical
A sample of a metal oxide has formula $M_{0.83} O_{1.00}$ . The metal $M$ can exist in two oxidation states $+ 2$ and $+ 3$ . In the sample of $M_{0.83} O_{1.00}$ , the percentage of metal ions…2023 · 31 Jan · Shift 2 · Q20 · Numerical
If a rocket runs on a fuel ( $C_{15} H_{30}$ ) and liquid oxygen, the weight of oxygen required and $C O_{2}$ released for every litre of fuel respectively are : (Given : density of the fuel is 0.756 g/mL)2022 · 24 Jun · Shift 1 · Q1 · MCQ
A 0.166 g sample of an organic compound was digested with conc. $H_{2} S O_{4}$ and then distilled with $N a O H$ . The ammonia gas evolved was passed through 50.0 mL of 0.5 N $H_{2} S O_{4}$ . The used acid required 30.0 mL of 0.25 N $N a O H$ for complete…2022 · 24 Jun · Shift 1 · Q19 · Numerical
120 g of an organic compound that contains only carbon and hydrogen gives 330 g of $C O_{2}$ and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are2022 · 24 Jun · Shift 2 · Q1 · MCQ
$SO_{2} Cl_{2}$ on reaction with excess of water results into acidic mixture $SO_{2} Cl_{2} + 2 H_{2} O \to H_{2} SO_{4} + 2 HCl$ 16 moles of $NaOH$ …2022 · 25 Jul · Shift 1 · Q1 · MCQ
56.0 L of nitrogen gas is mixed with excess hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of unused nitrogen gas is found to be L.2022 · 25 Jul · Shift 2 · Q14 · Numerical
A sample of 4.5 mg of an unknown monohydric alcohol, $R - O H$ was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is …2022 · 25 Jul · Shift 2 · Q20 · Numerical
The number of N atoms in 681 g of $C_{7} H_{5} N_{3} O_{6}$ is x $\times$ 1021. The value of x is (NA = 6.02 $\times$ 1023 mol $-$ 1) (Nearest Integer)2022 · 25 Jun · Shift 1 · Q15 · Numerical
1 L aqueous solution of $H_{2} S O_{4}$ contains 0.02 m mol $H_{2} S O_{4}$ . 50% of this solution is diluted with deionized water to give 1 L solution (A). In solution (A), 0.01 m mol of $H_{2} S O_{4}$ are added. Total m mols of $H_{2} S O_{4}$ in the final…2022 · 25 Jun · Shift 1 · Q18 · Numerical
Number of grams of bromine that will completely react with 5.0 g of pent-1-ene is $\times$ 10 $-$ 2 g. (Atomic mass of Br = 80 g/mol) [Nearest Integer]2022 · 25 Jun · Shift 1 · Q23 · Numerical
A protein 'A' contains 0.30% of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is $\times$ 103 g mol $-$ 1 [nearest integer]2022 · 25 Jun · Shift 2 · Q16 · Numerical
Chlorophyll extracted from the crushed green leaves was dissolved in water to make $2 L$ solution of Mg of concentration $48 ppm$ . The number of atoms of $Mg$ in this solution is $x \times 1 0^{20}$ atoms. The…2022 · 26 Jul · Shift 1 · Q16 · Numerical
When 800 mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5 g of nitric acid is evaporated. The molarity of the remaining nitric acid solution is x $\times$ 10 $-$ 2 M. (Nearest integer) (Molar mass of…2022 · 26 Jul · Shift 1 · Q19 · Numerical
Hemoglobin contains $0.34%$ of iron by mass. The number of Fe atoms in $3.3 g$ of hemoglobin is (Given: Atomic mass of Fe is $56 u, N_{A} = 6.022 \times 1 0^{23} mol^{- 1}$ .)2022 · 26 Jul · Shift 2 · Q1 · MCQ
A $100 mL$ solution of $CH_{3} CH_{2} MgBr$ on treatment with methanol produces $2.24 mL$ of a gas at STP. The weight of gas produced is mg. [nearest integer]2022 · 26 Jul · Shift 2 · Q19 · Numerical
A commercially sold conc. HCl is 35% HCl by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is: (Atomic mass : Cl = 35.5 amu, H = 1 amu)2022 · 26 Jun · Shift 1 · Q1 · MCQ
On complete combustion 0.30 g of an organic compound gave 0.20 g of carbon dioxide and 0.10 g of water. The percentage of carbon in the given organic compound is . (Nearest integer)2022 · 26 Jun · Shift 1 · Q18 · Numerical
$C N G$ is an important transportation fuel. When 100 g $C N G$ is mixed with 208 g $o x y g e n$ in vehicles, it leads to the formation of $C O_{2}$ and $H_{2} O$ and produces large quantity of heat during this combustion, then the amount of carbon…2022 · 26 Jun · Shift 2 · Q16 · Numerical
The moles of methane required to produce 81 g of water after complete combustion is $\times$ 10 $-$ 2 mol. [nearest integer]2022 · 26 Jun · Shift 2 · Q24 · Numerical
$250 g$ solution of $D$ -glucose in water contains $10.8%$ of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are, $H, 1 u; C, 12 u; O, 16 u$ …2022 · 27 Jul · Shift 1 · Q1 · MCQ
In Carius method of estimation of halogen, $0.45 g$ of an organic compound gave $0.36 g$ of $AgBr$ . Find out the percentage of bromine in the compound. (Molar masses : $AgBr = 188 g mol^{- 1}; Br = 80 g mol^{- 1}$ …2022 · 27 Jul · Shift 1 · Q12 · MCQ
$20 mL$ of $0.02 M K_{2} Cr_{2} O_{7}$ solution is used for the titration of $10 mL$ of $Fe^{2 +}$ solution in the acidic medium. The molarity of $Fe^{2 +}$ …2022 · 27 Jul · Shift 1 · Q14 · Numerical
Two elements A and B which form 0.15 moles of $A_{2} B$ and $A B_{3}$ type compounds. If both $A_{2} B$ and $A B_{3}$ weigh equally, then the atomic weight of A is times of atomic weight of B.2022 · 27 Jun · Shift 1 · Q18 · Numerical
116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12, respectively. The data agrees with how many formulae of the…2022 · 27 Jun · Shift 2 · Q15 · Numerical
In the given reaction, $X + Y + 3 Z ⇆ X Y Z_{3}$ if one mole of each of $X$ and $Y$ with $0.05 mol$ of $Z$ gives compound $X Y Z_{3}$ . (Given : Atomic masses of $X, Y$ and $Z$ are 10, 20 and 30 amu, respectively.) The…2022 · 28 Jul · Shift 1 · Q14 · Numerical
On complete combustion of $0.492 g$ of an organic compound containing $C, H$ and $O$ , $0.7938 g$ of $CO_{2}$ and $0.4428 g$ of $H_{2} O$ was produced. The…2022 · 28 Jul · Shift 1 · Q22 · Numerical
2L of 0.2M $H_{2} S O_{4}$ is reacted with 2L of 0.1M $N a O H$ solution, the molarity of the resulting product $N a_{2} S O_{4}$ in the solution is millimolar. (Nearest integer)2022 · 28 Jul · Shift 2 · Q14 · Numerical
Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is, Given : Atomic masses of C, H and N are 12, 1 and 14 amu respectively. The molar mass of the compound A is 162 g mol $-$ 1.2022 · 28 Jun · Shift 2 · Q1 · MCQ
The complete combustion of 0.492 g of an organic compound containing 'C', 'H' and 'O' gives 0.793 g of $C O_{2}$ and 0.442 g of $H_{2} O$ . The percentage of oxygen composition in the organic compound is . (nearest…2022 · 28 Jun · Shift 2 · Q19 · Numerical
$N_{2 (g)} + 3 H_{2 (g)} ⇌ 2 NH_{3 (g)}$ $20 g 5 g$ Consider the above reaction, the limiting reagent of the reaction and number of moles…2022 · 29 Jul · Shift 1 · Q2 · MCQ
Consider the reaction $4 HNO_{3} (1) + 3 KCl (s) \to Cl_{2} (g) + NOCl (g) + 2 H_{2} O (g) + 3 KNO_{3} (s)$ The amount of $HNO_{3}$ …2022 · 29 Jul · Shift 2 · Q1 · MCQ
A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344 mL of $H_{2}$ gas at STP. The number of alcoholic hydrogens present in compound 'X' is .2022 · 29 Jul · Shift 2 · Q21 · Numerical
$C (s) + O_{2} (g) \to CO_{2} (g) + 400 kJ C (s) + \frac{1}{2} O_{2} (g) \to CO (g) + 100 kJ$ …2022 · 29 Jul · Shift 2 · Q3 · MCQ
Production of iron in blast furnace follows the following equation $F e_{3} O_{4}$ (s) + 4 $C O$ (g) $\to$ 3 $F e$ (l) + 4 $C O_{2}$ (g) when 4.640 kg of $F e_{3} O_{4}$ and 2.520 kg of $C O$ are allowed to react then the amount of iron (in g) produced is : [Given…2022 · 29 Jun · Shift 1 · Q1 · MCQ
Blister copper is produced by reaction of copper oxide with copper sulphide. 2 $C u_{2} O$ + $C u_{2} S$ $\to$ 6 $C u$ + $S O_{2}$ When 2.86 $\times$ 103 g of $C u_{2} O$ and 4.77 $\times$ 103 g of $C u_{2} S$ are used for reaction, the mass of copper produced…2022 · 30 Jun · Shift 1 · Q15 · Numerical
The number of atoms in 8g of sodium is x $\times$ 1023. The value of x is . (Nearest integer) [Given : NA = 6.02 $\times$ 1023 mol $-$ 1 Atomic mass of Na = 23.0 u]2021 · 1 Sep · Shift 2 · Q18 · Numerical
If 80 g of copper sulphate $C u S O_{4}$ . 5 $H_{2} O$ is dissolved in deionised water to make 5L of solution. The concentration of the copper sulphate solution is x $\times$ 10 $-$ 3 mol L $-$ 1. The value of x is .…2021 · 1 Sep · Shift 2 · Q19 · Numerical
Complete combustion of 750 g of an organic compound provides 420 g of $C O_{2}$ and 210 g of $H_{2} O$ . The percentage composition of carbon and hydrogen in organic compound is 15.3 and respectively. (Round off to the…2021 · 16 Mar · Shift 1 · Q16 · Numerical
$2 M n O_{4}^{-} + b C_{2} O_{4}^{2 -} + c H^{+} \to x M n^{2 +} + y C O_{2} + z H_{2} O$ If the above equation is balanced with integer coefficients, the value of c is . (Round off to the Nearest Integer).2021 · 16 Mar · Shift 1 · Q18 · Numerical
A 6.50 molal solution of KOH (aq.) has a density of 1.89 g cm $-$ 3. The molarity of the solution is mol dm $-$ 3. (Round off to the Nearest Integer). [Atomic masses : K : 39.0 u; O : 16.0 u; H : 1.0 u]2021 · 16 Mar · Shift 1 · Q19 · Numerical
When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, $\times$ 10 $-$ 5 moles of lead sulphate precipitate out. (Round off to the Nearest Integer).2021 · 16 Mar · Shift 2 · Q21 · Numerical
The exact volumes of 1 M $N a O H$ solution required to neutralise 50 mL of 1 M $H_{3} P O_{3}$ solution and 100 mL of 2 M $H_{3} P O_{2}$ solution, respectively, are :2021 · 16 Mar · Shift 2 · Q4 · MCQ
15 mL of aqueous solution of $F e^{2 +}$ in acidic medium completely reacted with 20 mL of 0.03 M aqueous $C r_{2} O$ $_{7}^{2 -}$ . The molarity of the $F e^{2 +}$ solution is $\times$ 10-2 M. (Round off to the Nearest…2021 · 17 Mar · Shift 1 · Q16 · Numerical
The mole fraction of a solute in a 100 molal aqueous solution is $\times$ 10 $-$ 2. (Round off to the Nearest Integer). [Given : Atomic masses : H : 1.0 u, O : 16.0 u ]2021 · 17 Mar · Shift 1 · Q20 · Numerical
Consider the above reaction. The percentage yield of amide product is . (Round off to the Nearest Integer). (Given : Atomic mass : C : 12.0 u, H : 1.0 u, N : 14.0 u, O : 16.0 u, Cl : 35.5 u) Includes diagram2021 · 17 Mar · Shift 2 · Q15 · Numerical
grams of 3-Hydroxy propanal (MW = 74) must be dehydrated to produce 7.8 g of acrolein (MW = 56) ( $C_{3} H_{4} O$ ) if the percentage yield is 64. (Round off to the Nearest Integer). [Given : Atomic masses : C : 12.0 u,…2021 · 18 Mar · Shift 1 · Q19 · Numerical
A reaction of 0.1 mole of Benzylamine with bromomethane gave 23 g of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are n $\times$ 10 $-$ 1, when n = . (Round off…2021 · 18 Mar · Shift 1 · Q20 · Numerical
Complete combustion of 3g of ethane gives x $\times$ 1022 molecules of water. The value of x is . (Round off to the Nearest Integer). [Use : NA = 6.023 $\times$ 1023; Atomic masses in u : C : 12.0; O : 16.0; H :…2021 · 18 Mar · Shift 1 · Q24 · Numerical
10.0 mL of $N a_{2} C O_{3}$ solution is titrated against 0.2 M $H C l$ solution. The following titre values were obtained in 5 readings : 4.8 mL, 4.9 mL, 5.0 mL, 5.0 mL and 5.0 mL Based on these readings, and convention of titrimetric estimation…2021 · 18 Mar · Shift 2 · Q15 · Numerical
250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl. The number of unreacted HCl molecules in the solution after complete reaction is $\times$ 1021. (Nearest integer) (NA = 6.022 $\times$ 1023)2021 · 20 Jul · Shift 1 · Q13 · Numerical
An average person needs about 10000 kJ energy per day. The amount of glucose (molar mass = 180.0 g mol $-$ 1) needed to meet this energy requirement is g. (Use : $Δ$ CH(glucose) = $-$ 2700 kJ mol $-$ 1)2021 · 20 Jul · Shift 1 · Q20 · Numerical
4g equimolar mixture of $N a O H$ and $N a_{2} C O_{3}$ contains x g of $N a O H$ and y g of $N a_{2} C O_{3}$ . The value of x is g. (Nearest integer)2021 · 20 Jul · Shift 2 · Q20 · Numerical
If the concentration of glucose ( $C_{6} H_{12} O_{6}$ ) in blood is 0.72 g L $-$ 1, the molarity of glucose in blood is $\times$ 10 $-$ 3 M. (Nearest integer) [Given : Atomic mass of C = 12, H = 1, O = 16 u]2021 · 22 Jul · Shift 2 · Q23 · Numerical
4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x $\times$ 10-1. The value of x is . (Rounded off to the nearest integer)2021 · 24 Feb · Shift 1 · Q19 · Numerical
The formula of a gaseous hydrocarbon which requires 6 times of its own volume of $O_{2}$ for complete oxidation and produces 4 times its own volume of $C O_{2}$ is CxHy. The value of y is .2021 · 24 Feb · Shift 2 · Q15 · Numerical
1.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained after purification (in g) is $\times$ 10 $-$ 2.2021 · 24 Feb · Shift 2 · Q17 · Numerical
Complete combustion of 1.80 g of an oxygen containing compound ( $C_{x} H_{y} O_{z}$ ) gave 2.64 g of $C O_{2}$ and 1.08 g of $H_{2} O$ . The percentage of oxygen in the organic compound is :2021 · 25 Feb · Shift 1 · Q10 · MCQ
In basic medium $C r O_{4}^{2 -}$ oxidises $S_{2} O_{3}^{2 -}$ to form $S O_{4}^{2 -}$ and itself changes into $C r (O H)_{4}^{-}$ . The volume of 0.154 M $C r O_{4}^{2 -}$ required to react with 40 mL of 0.25 M $S_{2} O_{3}^{2 -}$ is …2021 · 25 Feb · Shift 1 · Q19 · Numerical
When 10 mL of an aqueous solution of $F e^{2 +}$ ions was titrated in the presence of dil $H_{2} S O_{4}$ using diphenylamine indicator, 15 mL of 0.02 M solution of $K_{2} C r_{2} O_{7}$ was required to get the end point. The molarity of the solution…2021 · 25 Jul · Shift 1 · Q22 · Numerical
Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is $\times$ 10 $-$ 1 g. (in nearest integer)2021 · 25 Jul · Shift 1 · Q23 · Numerical
An aqueous KCl solution of density 1.20 g mL $-$ 1 has a molality of 3.30 mol kg $-$ 1. The molarity of the solution in mol L $-$ 1 is (Nearest integer) [Molar mass of KCl = 74.5]2021 · 26 Aug · Shift 1 · Q22 · Numerical
100 mL of $N a_{3} P O_{4}$ solution contains 3.45 g of sodium. The molarity of the solution is $\times$ 10 $-$ 2 mol L $-$ 1. (Nearest integer) [Atomic Masses - Na : 23.0 u, O : 16.0 u, P : 31.0 u]2021 · 26 Aug · Shift 2 · Q18 · Numerical
The $N a N O_{3}$ weighed out to make 50 mL of an aqueous solution containing 70.0 mg $N a^{+}$ per mL is g. (Rounded off to the nearest integer) [Given : Atomic weight in g mol $-$ 1 - $N a$ : 23; N : 14; O : 16]2021 · 26 Feb · Shift 2 · Q25 · Numerical
In Carius method for estimation of halogens, 0.2 g of an organic compound gave 0.188 g of AgBr. The percentage of bromine in the compound is . (Nearest integer) [Atomic mass : Ag = 108, Br = 80]2021 · 27 Aug · Shift 1 · Q13 · Numerical
100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x $\times$ 10 $-$ 2. The value of x is . (Nearest integer) [Atomic weight : H = 1.008;…2021 · 27 Aug · Shift 2 · Q16 · Numerical
The density of $N a O H$ solution is 1.2 g cm $-$ 3. The molality of this solution is m. (Round off to the Nearest Integer) [Use : Atomic mass : Na : 23.0 u, O : 16.0 u, H : 1.0 u, Density of $H_{2} O$ : 1.0 g cm $-$ 3]2021 · 27 Jul · Shift 1 · Q14 · Numerical
2 $S O_{2}$ (g) + $O_{2}$ (g) $\to$ 2 $S O_{3}$ (g) The above reaction is carried out in a vessel starting with partial pressure $P S O_{2}$ = 250 m bar, $P O_{2}$ = 750 m bar and $P S O_{3}$ = 0 bar. When the reaction is complete, the total pressure in the…2021 · 27 Jul · Shift 2 · Q15 · Numerical
The molarity of the solution prepared by dissolving 6.3 g of oxalic acid ( $H_{2} C_{2} O_{4} .2 H_{2} O$ ) in 250 mL of water in mol L $-$ 1 is x $\times$ 10 $-$ 2. The value of x is . (Nearest integer) [Atomic mass : H : 1.0,…2021 · 31 Aug · Shift 1 · Q15 · Numerical
Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is $\times$ 10…2021 · 31 Aug · Shift 2 · Q19 · Numerical
The ratio of the mass percentages of ‘C & H’ and ‘C & O’ of a saturated acyclic organic compound ‘X’ are 4 : 1 and 3 : 4 respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound…2020 · 2 Sep · Shift 2 · Q2 · Numerical
The mole fraction of glucose ( $C_{6} H_{12} O_{6}$ ) in an aqueous binary solution is 0.1. The mass percentage of water in it, to the nearest integer, is .2020 · 3 Sep · Shift 1 · Q10 · Numerical
The volume strength of 8.9 M $H_{2} O_{2}$ solution calculated at 273 K and 1 atm is . (R = 0.0821 L atm K-1 mol-1) (rounded off ot the nearest integer)2020 · 3 Sep · Shift 1 · Q9 · Numerical
The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity (M), respectively, are: (Take molar mass of hydrogen peroxide as 34 g/mol)2020 · 3 Sep · Shift 2 · Q16 · MCQ
6.023 $\times$ 1022 molecules are present in 10 g of a substance 'x'. The molarity of a solution containing 5 g of substance 'x' in 2 L solution is × 10-32020 · 3 Sep · Shift 2 · Q18 · Numerical
The volume (in mL) of 0.1 N NaOH required to neutralise 10 mL of 0.1 N phosphinic acid is .2020 · 3 Sep · Shift 2 · Q20 · Numerical
A 20.0 mL solution containing 0.2 g impure $H_{2} O_{2}$ reacts completely with 0.316 g of $K M n O_{4}$ in acid solution. The purity of $H_{2} O_{2}$ (in %) is (mol. wt. of $H_{2} O_{2}$ = 34; mol. wt. of $K M n O_{4}$ = 158)2020 · 4 Sep · Shift 1 · Q6 · Numerical
The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is .2020 · 4 Sep · Shift 1 · Q7 · Numerical
Consider the following equations : 2 $F e^{2 +}$ + $H_{2} O_{2}$ $\to$ xA + yB (in basic medium) 2 $M n O_{4}^{-}$ + 6 $H^{+}$ + 5 $H_{2} O_{2}$ $\to$ x'C + y'D + z'E (in acidic medium) The sum of the stoichiometric coefficients x, y, x', y', and z' for products…2020 · 4 Sep · Shift 2 · Q10 · Numerical
A solution of two components containing $n_{1}$ moles of the 1st component and $n_{2}$ moles of the 2nd component is prepared. $M_{1}$ and $M_{2}$ are the molecular weights of component 1 and 2 respectively. If d is the density of the solution in…2020 · 6 Sep · Shift 1 · Q18 · MCQ
The average molar mass of chlorine is 35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally occuring chlorine is close to :2020 · 6 Sep · Shift 2 · Q2 · MCQ
Amongst the following statements, that which was not proposed by Dalton was :2020 · 7 Jan · Shift 1 · Q11 · MCQ
The flocculation value of $H C l$ for arsenic sulphide sol. is 30 m mol L-1 If $H_{2} S O_{4}$ is used for the flocculatiopn of arsenic sulphide, the amount in grams, of $H_{2} S O_{4}$ in 250 ml required for the above purposed is …2020 · 7 Jan · Shift 2 · Q17 · Numerical
The ammonia ( $N H_{3}$ ) released on quantitative reaction of 0.6 g urea ( $N H_{2} C O N H_{2}$ ) with sodium hydroxide ( $N a O H$ ) can be neutralized by :2020 · 7 Jan · Shift 2 · Q4 · MCQ
The volume (in mL) of 0.125 M $A g N O_{3}$ required to quantitatively precipitate chloride ions in 0.3 g of $[C o (N H_{3})_{6}] C l_{3}$ is . M $[C o (N H_{3})_{6} C l_{3}]$ = 267.46 g/mol M $A g N O_{3}$ = 169.87 g/mol2020 · 8 Jan · Shift 1 · Q10 · Numerical
Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is . Atomic weight : Fe = 55.85; S = 32.00; O = 16.002020 · 8 Jan · Shift 1 · Q8 · Numerical
The molarity of $H N O_{3}$ in a sample which has density 1.4 g/mL and mass percentage of 63% is . (Molecular Weight of $H N O_{3}$ = 63)2020 · 9 Jan · Shift 1 · Q13 · Numerical
The hardness of a water sample containing 10–3 M $M g S O_{4}$ expressed as $C a C O_{3}$ equivalents (in ppm) is . (molar mass of $M g S O_{4}$ is 120.37 g/mol)2020 · 9 Jan · Shift 1 · Q14 · Numerical
10.30 mg of $O_{2}$ is dissolved into a liter of sea water of density 1.03 g/mL. The concentration of $O_{2}$ in ppm is .2020 · 9 Jan · Shift 2 · Q6 · Numerical
The percentage composition of carbon by mole in methane is :2019 · 8 Apr · Shift 2 · Q19 · MCQ
For a reaction, $N_{2}$ (g) + 3 $H_{2}$ (g) $\to$ 2 $N H_{3}$ (g) ; identify dihydrogen ( $H_{2}$ ) as a limiting reagent in the following reaction mixtures.2019 · 9 Apr · Shift 1 · Q10 · MCQ
What would be the molality of 20% (mass/ mass) aqueous solution of KI? (molar mass of KI = 166 g mol–1)2019 · 9 Apr · Shift 2 · Q19 · MCQ
A solution of sodium sulphate contains 92 g of $N a^{+}$ ions per kilogram of water. The molality of $N a^{+}$ ions in that solution in mol kg $-$ 1 is :2019 · 9 Jan · Shift 1 · Q12 · MCQ
For the following reaction, in the mass of water produced from 445 g of $C_{57} H_{110} O_{6}$ is : 2 $C_{57} H_{110} O_{6}$ (s) + 163 $O_{2}$ (g) $\to$ 114 $C O_{2}$ (g) + 110 $H_{2} O$ (l)2019 · 9 Jan · Shift 2 · Q22 · MCQ
At 300 K and 1 atmospheric pressure, 10 mL of a hydrocarbon required 55 mL of $O_{2}$ for complete combustion, and 40 mL of $C O_{2}$ is formed. The formula of the hydrocarbon is :2019 · 10 Apr · Shift 1 · Q12 · MCQ
The minimum amount of $O_{2}$ (g) consumed per gram of reactant is for the reaction : (Given atomic mass : Fe = 56, O = 16, Mg = 24, P = 31, C = 12, H = 1)2019 · 10 Apr · Shift 2 · Q9 · MCQ
The amount of sugar ( $C_{12} H_{22} O_{11}$ ) required to prepare 2L of its 0.1 M aqueous solution is :2019 · 10 Jan · Shift 2 · Q16 · MCQ
An organic compound is estimated through Duma's method and was found to evolve 6 moles of $C O_{2}$ . 4 moles of $H_{2} O$ and 1 mole of nitrogen gas. The formula of the compound is :2019 · 11 Jan · Shift 1 · Q19 · MCQ
A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of $C O_{2}$ at T = 298.15 K and p = 1 bar. If molar volume of $C O_{2}$ is 25.0 L under such condition, what is the percentage of sodium bicarbonate in…2019 · 11 Jan · Shift 1 · Q3 · MCQ
25 ml of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30 mL of 0.2 M aqueous NaOH solutions ?2019 · 11 Jan · Shift 2 · Q10 · MCQ
The mole fraction of a solvent in aqueous solution of a solute is 0.8. The molality (in mol kg–1 ) of the aqueous solution is :2019 · 12 Apr · Shift 1 · Q14 · MCQ
5 moles of $A B_{2}$ weigh 125 × 10–3 kg and 10 moles of $A_{2} B_{2}$ weigh 300 × 10–3 kg. The molar mass of A (MA) and molar mass of B (MB) in kg mol are:2019 · 12 Apr · Shift 1 · Q5 · MCQ
Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, $M n O_{2}$ and gaseous product. $M n O_{2}$ reacts with $N a C l$ and concentrated $H_{2} O_{4}$ to give a pungent gas Z. X, Y and Z, respectively, are :2019 · 12 Apr · Shift 2 · Q14 · MCQ
25 g of an unknown hydrocarbon upon burning produces 88 g of $C O_{2}$ and 9 g of $H_{2} O$ . This unknown hydrocarbon contains :2019 · 12 Apr · Shift 2 · Q15 · MCQ
8 g of $N a O H$ is dissolved in 18g of $H_{2} O$ . Mole fraction of $N a O H$ in solution and molality (in mol kg–1) of the solution respectively are -2019 · 12 Jan · Shift 2 · Q12 · MCQ
A sample of $N a C l O_{3}$ is converted by heat to $N a C l$ with a loss of $0.16 g$ of oxygen. The residue is dissolved in water and precipitated as $A g C l .$ The mass of $A g C l$ (in $g$ ) obtained will be : (Given : Molar mass of $A g C l = 143.5 g m o l^{- 1}$ …2018 · 15 Apr · Shift 1 · Q24 · MCQ
For per gram of reactant, the maximum quantity of $N_{2}$ gas is produced in which of the following thermal decomposition reactions ? (Given : Atomic wt. - Cr = 52 u, Ba = 137 u)2018 · 15 Apr · Shift 2 · Q22 · MCQ
An unknown chlorohydrocarbon has 3.55% of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are : (Atomic wt. of Cl = 35.5 u; Avogadro constant = 6.023 $\times$ …2018 · 16 Apr · Shift 1 · Q11 · MCQ
The ratio of mass percent of C and H of an organic compound ( $C_{X} H_{Y} O_{Z}$ ) is 6 : 1. If one molecule of the above compound ( $C_{X} H_{Y} O_{Z}$ ) contains half as much oxygen as required to burn one molecule of compound $C_{X} H_{Y}$ completely to $C O_{2}$ …2018 · Shift 0 · Q26 · MCQ
Excess of $N a O H$ (aq) was added to 100 mL of $F e C l_{3}$ (aq) resulting into 2.14 g of $F e (O H)_{3}$ . The molarity of $F e C l_{3}$ (aq) is : (Given molar mass of Fe = 56 g mol−1 and molar mass of Cl = 35.5 g mol−1)2017 · 8 Apr · Shift 1 · Q24 · MCQ
What quantity (in mL) of a 45% acid solution of a mono-protic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid solution ?2017 · 9 Apr · Shift 1 · Q20 · MCQ
The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%); Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all 1H atoms are replaced by 2H atoms is:2017 · Shift 0 · Q13 · MCQ