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Redox Reactions

66 questions · Chemistry · JEE Main

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JEE Main
Chemistry
Redox Reactions

Redox Reactions

66 questions · Chemistry · JEE Main

$KMnO_{4}$ acts as an oxidising agent in acidic medium. ' X ' is the difference between the oxidation states of Mn in reactant and product. ' Y ' is the number of ' d ' electrons present in the brown red precipitate formed at the…2025 · 4 Apr · Shift 1 · Q24 · Numerical
Some $CO_{2}$ gas was kept in a sealed container at a pressure of 1 atm and at 273 K . This entire amount of $CO_{2}$ gas was later passed through an aqueous solution of $Ca (OH)_{2}$ . The excess unreacted $Ca (OH)_{2}$ …2025 · 22 Jan · Shift 1 · Q22 · Numerical
The species which does not undergo disproportionation reaction is :2025 · 22 Jan · Shift 2 · Q18 · MCQ
Match the List - I with List - II Choose the correct answer from the options given below: Includes table2025 · 28 Jan · Shift 1 · Q16 · MCQ
Which of the following oxidation reactions are carried out by both $K_{2} Cr_{2} O_{7}$ and $KMnO_{4}$ in acidic medium? A. $Γ^{-} \to I_{2}$ B. $S^{2 -} \to S$ C. $Fe^{2 +} \to Fe^{3 +}$ …2025 · 28 Jan · Shift 1 · Q18 · MCQ
Given below are two statements: Statement I: In the oxalic acid vs $KMnO_{4}$ (in the presence of dil $H_{2} SO_{4}$ ) titration the solution needs to be heated initially to $6 0^{\circ} C$ , but no heating is…2025 · 28 Jan · Shift 1 · Q9 · MCQ
0.1 M solution of KI reacts with excess of $H_{2} SO_{4}$ and $KIO_{3}$ solutions. According to equation $5 I^{-} + IO_{3}^{-} + 6 H^{+} \to 3 I_{2} + 3 H_{2} O$ …2025 · 29 Jan · Shift 2 · Q5 · MCQ
Which of the following reactions are disproportionation reactions? (A) $Cu^{+} \to Cu^{2 +} + Cu$ (B) $3 MnO_{4}^{2 -} + 4 H^{+} ⟶ 2 MnO_{4}^{-} + MnO_{2} + 2 H_{2} O$ …2024 · 1 Feb · Shift 1 · Q1 · MCQ
In acidic medium, $K_{2} Cr_{2} O_{7}$ shows oxidising action as represented in the half reaction: $Cr_{2} O_{7}^{2 -} + XH^{+} + Ye^{⊖} \to 2 A + ZH_{2} O$ …2024 · 1 Feb · Shift 1 · Q17 · MCQ
Only $KMnO_{4}$ of $KMnO_{4}$ solution of unknown molarity is required to reach the end point of a titration of $(2 M)$ of oxalic acid $(2 M)$ in acidic medium. The molarity of $KMnO_{4}$ solution…2024 · 4 Apr · Shift 1 · Q22 · Numerical
When $MnO_{2}$ and $H_{2} SO_{4}$ is added to a salt $(A)$ , the greenish yellow gas liberated as salt (A) is :2024 · 4 Apr · Shift 2 · Q10 · MCQ
The number of ions from the following that are expected to behave as oxidising agent is : $Sn^{4 +}, Sn^{2 +}, Pb^{2 +}, Tl^{3 +}, Pb^{4 +}, Tl^{+}$ 2024 · 6 Apr · Shift 2 · Q1 · MCQ
Match List I with List II. Choose the correct answer from the options given below : Includes table2024 · 6 Apr · Shift 2 · Q5 · MCQ
Thiosulphate reacts differently with iodine and bromine in the reactions given below: $2 S_{2} O_{3}^{2 -} + I_{2} \to S_{4} O_{6}^{2 -} + 2 I^{-} S_{2} O_{3}^{2 -} + 5 Br_{2} + 5 H_{2} O \to 2 SO_{4}^{2 -} + 4 Br^{-} + 10 H^{+}$ …2024 · 8 Apr · Shift 1 · Q2 · MCQ
Which of the following cannot function as an oxidising agent?2024 · 27 Jan · Shift 2 · Q13 · MCQ
In alkaline medium, $MnO_{4}^{-}$ oxidises $I^{-}$ to2024 · 29 Jan · Shift 1 · Q20 · MCQ
Chlorine undergoes disproportionation in alkaline medium as shown below : $aCl_{2 (g)} + b OH_{(aq)}^{-} \to c ClO_{(aq)}^{-} + d Cl_{(aq)}^{-} + e H_{2} O_{(l)}$ …2024 · 29 Jan · Shift 1 · Q7 · MCQ
The oxidation number of iron in the compound formed during brown ring test for NO $_{3}^{-}$ iron is .2024 · 29 Jan · Shift 2 · Q29 · Numerical
$2 MnO_{4}^{-} + bI^{-} + cH_{2} O \to x I_{2} + y MnO_{2} + z \overline{O} H$ If the above equation is balanced with integer coefficients, the value of $z$ is …2024 · 30 Jan · Shift 1 · Q26 · Numerical
Total number of species from the following which can undergo disproportionation reaction is . $H_{2} O_{2}, ClO_{3}^{-}, P_{4}, Cl_{2}, Ag, Cu^{+ 1}, F_{2}, NO_{2}, K^{+}$ …2024 · 30 Jan · Shift 2 · Q24 · Numerical
In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is $(+)$ .2024 · 31 Jan · Shift 2 · Q24 · Numerical
Number of moles of $H^{+}$ ions required by $MnO_{4}^{-}$ of $MnO_{4}^{-}$ to oxidise oxalate ion to $CO_{2}$ is .2024 · 31 Jan · Shift 2 · Q27 · Numerical
Sum of oxidation states of bromine in bromic acid and perbromic acid is .2023 · 1 Feb · Shift 1 · Q17 · Numerical
In ammonium - phosphomolybdate, the oxidation state of Mo is + 2023 · 6 Apr · Shift 1 · Q22 · Numerical
Which of the following options are correct for the reaction $2 [Au (CN)_{2}]^{-} (aq) + Zn (s) \to 2 Au (s) + [Zn (CN)_{4}]^{2 -} (aq)$ …2023 · 6 Apr · Shift 1 · Q5 · MCQ
$2 IO_{3}^{-} + x I^{-} + 12 H^{+} \to 6 I_{2} + 6 H_{2} O$ What is the value of $x$ ?2023 · 8 Apr · Shift 1 · Q5 · MCQ
The sum of oxidation state of the metals in $Fe (CO)_{5}, VO^{2 +}$ and $WO_{3}$ is .2023 · 8 Apr · Shift 2 · Q20 · Numerical
Given below are two statements: Statement I : In redox titration, the indicators used are sensitive to change in $pH$ of the solution. Statement II : In acid-base titration, the indicators used are sensitive to change in oxidation…2023 · 8 Apr · Shift 2 · Q6 · MCQ
In alkaline medium, the reduction of permanganate anion involves a gain of electrons.2023 · 10 Apr · Shift 2 · Q15 · Numerical
See the following chemical reaction: $Cr_{2} O_{7}^{2 -} + XH^{+} + 6 F_{e}^{2 +} \to YCr^{3 +} + 6 F_{e}^{3 +} + Z H_{2} O$ The sum of $X, Y$ …2023 · 13 Apr · Shift 2 · Q15 · Numerical
The density of a monobasic strong acid (Molar mass 24.2 g/mol) is 1.21 kg/L. The volume of its solution required for the complete neutralization of 25 mL of 0.24 M NaOH is $\times$ 10 $^{- 2}$ mL (Nearest integer)2023 · 25 Jan · Shift 1 · Q14 · Numerical
The oxidation state of phosphorus in hypophosphoric acid is + .2023 · 31 Jan · Shift 1 · Q21 · Numerical
The neutralization occurs when 10 mL of 0.1M acid 'A' is allowed to react with 30 mL of 0.05 M base $M (O H)_{2}$ . The basicity of the acid 'A' is . [ $M$ is a metal]2022 · 25 Jun · Shift 2 · Q22 · Numerical
Which of the given reactions is not an example of disproportionation reaction?2022 · 26 Jul · Shift 1 · Q4 · MCQ
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$ . Assertion A: Phenolphthalein is a $pH$ dependent indicator, remains colourless in acidic solution and…2022 · 26 Jul · Shift 2 · Q12 · MCQ
$0.02 M$ of $0.02 M$ hypo solution is used for the titration of $Cu^{2 +}$ of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of $Cu^{2 +}$ is found to…2022 · 26 Jul · Shift 2 · Q16 · Numerical
Which one of the following is an example of disproportionation reaction ?2022 · 26 Jun · Shift 2 · Q5 · MCQ
The normality of $H_{2} SO_{4}$ in the solution obtained on mixing $0.1 M H_{2} SO_{4}$ of $0.1 M H_{2} SO_{4}$ with $0.1 M NaOH$ of $0.1 M NaOH$ is …2022 · 27 Jul · Shift 2 · Q15 · Numerical
0.01 M $K M n O_{4}$ solution was added to 20.0 mL of 0.05 M Mohr's salt solution through a burette. The initial reading of 50 mL burette is zero. The volume of $K M n O_{4}$ solution left in the burette after the end point is …2022 · 28 Jun · Shift 2 · Q21 · Numerical
A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with $CH_{3} COOH$ . Compound 'X' exists in ionized form in basic medium. The compound 'X' is2022 · 29 Jul · Shift 2 · Q15 · MCQ
Statement I : Sodium hydride can be used as an oxidising agent. Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer from the options given below :2021 · 16 Mar · Shift 2 · Q14 · MCQ
The oxidation states of nitrogen in $N O$ , $N O_{2}$ , $N_{2} O$ and NO $_{3}^{-}$ are in the order of :2021 · 18 Mar · Shift 2 · Q10 · MCQ
0.4 g mixture of $N a O H$ , $N a_{2} C O_{3}$ and some inert impurities was first titrated with $\frac{N}{10}$ $H C l$ using phenolphthalein as an indicator, 17.5 mL of $H C l$ was required at the end point. After this methyl orange was added and…2021 · 25 Feb · Shift 1 · Q18 · Numerical
Identify the process in which change in the oxidation state is five :2021 · 25 Jul · Shift 2 · Q14 · MCQ
Dichromate ion is treated with base, the oxidation number of Cr in the product formed is .2021 · 26 Feb · Shift 1 · Q18 · Numerical
The oxidation states of 'P' in $H_{4} P_{2} O_{7}$ , $H_{4} P_{2} O_{5}$ and $H_{4} P_{2} O_{6}$ , respectively, are :2021 · 27 Jul · Shift 1 · Q2 · MCQ
10.0 mL of 0.05 M $K M n O_{4}$ solution was consumed in a titration with 10.0 mL of given oxalic acid dihydrate solution. The strength of given oxalic acid solution is $\times$ 10 $-$ 2 g/L. (Round off to the nearest…2021 · 27 Jul · Shift 2 · Q16 · Numerical
While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?2020 · 2 Sep · Shift 1 · Q8 · MCQ
The oxidation states of transition metal atoms in $K_{2} C r_{2} O_{7}$ , $K M n O_{4}$ and $K_{2} F e O_{4}$ , respectively, are x, y and z. The sum of x, y and z is .2020 · 2 Sep · Shift 2 · Q4 · Numerical
A 100 mL solution was made by adding 1.43 g of $N a_{2} C O_{3}$ . $x H_{2} O$ . The normality of the solution is 0.1 N. The value of x is . (The atomic mass of $N a$ is 23 g/mol)2020 · 4 Sep · Shift 2 · Q8 · Numerical
The volume, in mL, of 0.02 M $K_{2} C r_{2} O_{7}$ solution required to react with 0.288 g of ferrous oxalate in acidic medium is . (Molar mass of Fe = 56 g mol–1)2020 · 5 Sep · Shift 2 · Q1 · Numerical
Oxidation number of potassium in $K_{2} O$ . $K_{2} O_{2}$ and $K O_{2}$ respectively is :2020 · 7 Jan · Shift 1 · Q20 · MCQ
The redox reaction among the following is :2020 · 7 Jan · Shift 2 · Q8 · MCQ
The compound that cannot act both as oxidising and reducing agent is :2020 · 9 Jan · Shift 1 · Q18 · MCQ
In order to oxidise a mixture of one mole of each of $F e C_{2} O_{4}$ , $F e_{2} (C_{2} O_{4})_{3}$ , $F e S O_{4}$ and $F e_{2} (S O_{4})_{3}$ in acidic medium, the number of moles of $K M n O_{4}$ required is :2019 · 8 Apr · Shift 1 · Q13 · MCQ
The correct order of the oxidation states of nitrogen in $N O$ , $N_{2} O$ , $N O_{2}$ and $N_{2} O_{3}$ is :2019 · 9 Apr · Shift 1 · Q17 · MCQ
In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of $C O_{2}$ is :2019 · 10 Jan · Shift 2 · Q22 · MCQ
An example of a disproportionation reaction is :2019 · 12 Apr · Shift 1 · Q1 · MCQ
The hardness of a water sample (in terms of equivalents of $C a C O_{3}$ ) containing 10–3 M $C a S O_{4}$ is (Molar mass of $C a S O_{4}$ = 136 g mol–1)2019 · 12 Jan · Shift 1 · Q12 · MCQ
50 mL of 0.5 M oxalic acid is needed to neutralize 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solution is -2019 · 12 Jan · Shift 1 · Q14 · MCQ
Which of the following reactions is an example of a redox reaction?2017 · Shift 0 · Q15 · MCQ
The volume of 0.1N dibasic acid sufficient to neutralize 1 g of a base that furnishes 0.04 mole of OH− in aqueous solution is :2016 · 10 Apr · Shift 1 · Q20 · MCQ
In which of the following reactions $H_{2} O_{2}$ acts as a reducing agent? 1. $H_{2} O_{2}$ + 2 $H^{+}$ + 2e- $\to$ 2 $H_{2} O$ 2. $H_{2} O_{2}$ - 2e- $\to$ $O_{2}$ + 2 $H^{+}$ 3. $H_{2} O_{2}$ + 2e- $\to$ 2 $O H^{-}$ 4. $H_{2} O_{2}$ + 2 $O H^{-}$ - 2e- $\to$ $O_{2}$ + 2 $H_{2} O$ 2014 · Shift 0 · Q4 · MCQ
Consider the following reaction: $x M n O_{4}^{-} + y C_{2} O_{4}^{2 -}$ + z $H^{+}$ $\to$ x $M n^{2 +}$ + 2y $C O_{2}$ + $\frac{z}{2} H_{2} O$ The value's of x, y and z in the reaction are, respectively :2013 · Shift 0 · Q26 · MCQ
Which of the following chemical reactions depicts the oxidizing behaviour of $H_{2} S O_{4}$ ?2006 · Shift 0 · Q32 · MCQ
Which of the following is a redox reaction ?2002 · Shift 0 · Q36 · MCQ