Chemical Equilibrium

108 questions · Chemistry · JEE Main

Chemical Equilibrium

108 questions · Chemistry · JEE Main

Consider the following equilibrium, $CO (g) + 2 H_{2} (g) ⇌ CH_{3} OH (g)$ 0.1 mol of CO along with a catalyst is present in a $2 dm^{3}$ flask maintained…2025 · 2 Apr · Shift 1 · Q24 · Numerical
Consider the following chemical equilibrium of the gas phase reaction at a constant temperature : $A (g) ⇌ B (g) + C (g)$ If $p$ being the total pressure, $K_{p}$ is the…2025 · 2 Apr · Shift 2 · Q20 · MCQ
Given below are two statements : Statement I : A catalyst cannot alter the equilibrium constant $(K_{c})$ of the reaction, temperature remaining constant. Statement II : A homogenous catalyst can change the…2025 · 3 Apr · Shift 1 · Q17 · MCQ
In the following system, $PCl_{5} (g) ⇋ PCl_{3} (g) + Cl_{2} (g)$ at equilibrium, upon addition of xenon gas at constant T \& p , the concentration of2025 · 3 Apr · Shift 1 · Q6 · MCQ
The equilibrium constant for decomposition of $H_{2} O(g) H_{2} O(g) ⇌ H_{2} (g) + \frac{1}{2} O_{2} (g) (Δ G^{\circ} = 92.34 kJ mol^{- 1})$ is $8.0 \times 1 0^{- 3}$ …2025 · 8 Apr · Shift 2 · Q23 · Numerical
A vessel at 1000 K contains $CO_{2}$ with a pressure of 0.5 atm . Some of $CO_{2}$ is converted into CO on addition of graphite. If total pressure at equilibrium is 0.8 atm , then Kp is :2025 · 22 Jan · Shift 1 · Q7 · MCQ
Consider the reaction $X_{2} Y (g) ⇌ X_{2} (g) + \frac{1}{2} Y_{2} (g)$ The equation representing correct relationship between the degree of dissociation (x) of $X_{2} Y (g)$ …2025 · 23 Jan · Shift 2 · Q15 · MCQ
$37.8 g N_{2} O_{5}$ was taken in a 1 L reaction vessel and allowed to undergo the following reaction at 500 K $2 N_{2} O_{5 (g)} ⇌ 2 N_{2} O_{4 (g)} + O_{2 (g)}$ …2025 · 24 Jan · Shift 1 · Q21 · Numerical
For the reaction, $H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)$ Attainment of equilibrium is predicted correctly by :2025 · 24 Jan · Shift 2 · Q14 · MCQ
At temperature T, compound $A B_{2 (g)}$ dissociates as $A B_{2 (g)} ⇌ A B_{(g)} + \frac{1}{2} B_{2 (g)}$ having degree of dissociation $x$ (small compared to unity). The correct expression for $x$ in terms of $K_{p}$ and $p$ is:2025 · 29 Jan · Shift 1 · Q13 · MCQ
Consider the equilibrium $CO (g) + 3 H_{2} (g) ⇌ CH_{4} (g) + H_{2} O (g)$ If the pressure applied over the system increases by two fold at constant…2025 · 29 Jan · Shift 2 · Q12 · MCQ
The equilibrium constant for the reaction $SO_{3} (g) ⇌ SO_{2} (g) + \frac{1}{2} O_{2} (g)$ is $K_{c} = 4.9 \times 1 0^{- 2}$ . The value of $K_{c}$ …2024 · 4 Apr · Shift 2 · Q17 · MCQ
The following reaction occurs in the Blast furnance where iron ore is reduced to iron metal $Fe_{2} O_{3 (s)} + 3 CO_{(g)} ⇌ Fe_{(l)} + 3 CO_{2 (g)}$ Using the Le-chatelier's…2024 · 5 Apr · Shift 1 · Q19 · MCQ
Given below are two statements : Statement I : On passing $HCl_{(g)}$ through a saturated solution of $BaCl_{2}$ , at room temperature white turbidity appears. Statement II : When $HCl$ gas is passed…2024 · 5 Apr · Shift 2 · Q4 · MCQ
At $- 2 0^{\circ} C$ and $1 atm$ pressure, a cylinder is filled with equal number of $H_{2}, I_{2}$ and $HI$ molecules for the reaction $H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)$ …2024 · 6 Apr · Shift 1 · Q4 · MCQ
The ratio $\frac{K _{P}}{K _{C}}$ for the reaction : $CO_{(g)} + \frac{1}{2} O_{2 (g)} ⇌ CO_{2 (g)}$ is :2024 · 6 Apr · Shift 2 · Q17 · MCQ
For the given hypothetical reactions, the equilibrium constants are as follows : $X ⇌ Y; K_{1} = 1.0 Y ⇌ Z; K_{2} = 2.0 Z ⇌ W; K_{3} = 4.0$ …2024 · 8 Apr · Shift 1 · Q12 · MCQ
For the reaction $N_{2} O_{4 (g)} ⇄ 2 NO_{2 (g)}, K_{p} = 0.492 atm$ at $300 K . K_{c}$ for the reaction at same temperature…2024 · 29 Jan · Shift 1 · Q24 · Numerical
The following concentrations were observed at $500 K$ for the formation of $NH_{3}$ from $N_{2}$ and $H_{2}$ . At equilibrium ; $[N_{2}] = 2 \times 1 0^{- 2} M, [H_{2}] = 3 \times 1 0^{- 2} M$ …2024 · 29 Jan · Shift 2 · Q24 · Numerical
For the given reaction, choose the correct expression of $K_{C}$ from the following :- $Fe_{(aq)}^{3 +} + SCN_{(aq)}^{-} ⇌ (FeSCN)_{(aq)}^{2 +}$ 2024 · 31 Jan · Shift 1 · Q12 · MCQ
$A_{(g)} ⇌ B_{(g)} + \frac{C}{2} (g)$ The correct relationship between $K_{P}, α$ and equilibrium pressure $P$ is2024 · 31 Jan · Shift 2 · Q2 · MCQ
(i) $X (g) ⇌ Y (g) + Z (g) K_{p 1} = 3$ (ii) $A (g) ⇌ 2 B (g) K_{p 2} = 1$ …2023 · 1 Feb · Shift 1 · Q20 · Numerical
The effect of addition of helium gas to the following reaction in equilibrium state, is : $PCl_{5} (g) ⇌ PCl_{3} (g) + Cl_{2} (g)$ 2023 · 1 Feb · Shift 2 · Q9 · Multiple correct
For a concentrated solution of a weak electrolyte ( $K_{eq} =$ equilibrium constant) $A_{2} B_{3}$ of concentration ' $c$ ', the degree of dissociation ' $α$ ' is :2023 · 6 Apr · Shift 1 · Q6 · MCQ
The equilibrium composition for the reaction $PCl_{3} + Cl_{2} ⇌ PCl_{5}$ at $298 K$ is given below: $[PCl_{3}]_{eq} = 0.2 mol L^{- 1}, [Cl_{2}]_{eq} = 0.1 mol L^{- 1}, [PCl_{5}]_{eq} = 0.40 mol L^{- 1}$ …2023 · 6 Apr · Shift 2 · Q20 · Numerical
The number of correct statement/s involving equilibria in physical processes from the following is (A) Equilibrium is possible only in a closed system at a given temperature. (B) Both the opposing processes occur…2023 · 10 Apr · Shift 1 · Q17 · Numerical
$A (g) ⇌ 2 B (g) + C (g)$ For the given reaction, if the initial pressure is $450 mm Hg$ and the pressure at time $t$ is $720 mm Hg$ at a constant…2023 · 10 Apr · Shift 2 · Q19 · Numerical
A mixture of 1 mole of $H_{2} O$ and 1 mole of $CO$ is taken in a 10 litre container and heated to $725 K$ . At equilibrium $40%$ of water by mass reacts with carbon monoxide according to the equation…2023 · 11 Apr · Shift 1 · Q22 · Numerical
4.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of $HI$ were found. The equilibrium constant for $H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)$ …2023 · 11 Apr · Shift 2 · Q20 · Numerical
Water decomposes at 2300 K $H_{2} O (g) \to H_{2} (g) + \frac{1}{2} O_{2} (g)$ The percent of water decomposing at 2300 K and 1 bar is (Nearest integer). Equilibrium constant for the reaction is $2 \times 1 0^{- 3}$ at…2023 · 29 Jan · Shift 1 · Q18 · Numerical
Consider the following reaction approaching equilibrium at 27 $^{\circ}$ C and 1 atm pressure $A + B$ $k_{r} = 10^{2} ⇌ k_{f} = 10^{3}$ $C + D$ The standard Gibb's…2023 · 29 Jan · Shift 1 · Q19 · Numerical
At 298 K $N_{2} (g) + 3 H_{2} (g) ⇌ 2N H_{3} (g), K_{1} = 4 \times 1 0^{5} N_{2} (g) + O_{2} (g) ⇌ 2NO (g), K_{2} = 1.6 \times 1 0^{12} H_{2} (g) + \frac{1}{2} O_{2} (g) ⇌ H_{2} O (g), K_{3} = 1.0 \times 1 0^{- 13}$ …2023 · 29 Jan · Shift 2 · Q18 · Numerical
Consider the following equation: $2 SO_{2} (g) + O_{2} (g) ⇌ 2 SO_{3} (g), Δ H = - 190 kJ$ The number of factors which will increase the yield of $SO_{3}$ at equilibrium from the…2023 · 30 Jan · Shift 2 · Q21 · Numerical
For reaction : $SO_{2} (g) + \frac{1}{2} O_{2} (g) ⇌ SO_{3} (g)$ $K_{p} = 2 \times 1 0^{12}$ at $2 7^{\circ} C$ and $1 atm$ pressure.…2023 · 31 Jan · Shift 1 · Q24 · Numerical
2 $O_{3}$ (g) $⇌$ 3 $O_{2}$ (g) At 300 K, ozone is fifty percent dissociated. The standard free energy change at this temperature and 1 atm pressure is ( $-$ ) J mol $-$ 1. (Nearest integer) [Given : ln…2022 · 24 Jun · Shift 1 · Q13 · Numerical
For a reaction at equilibrium A(g) $⇌$ B(g) + $\frac{1}{2}$ C(g) the relation between dissociation constant (K), degree of dissociation ( $α$ ) and equilibrium pressure (p) is given by :2022 · 24 Jun · Shift 1 · Q4 · MCQ
$P C l_{5}$ dissociates as $P C l_{5}$ (g) $⇌$ $P C l_{3}$ (g) + $C l_{2}$ (g) 5 moles of $P C l_{5}$ are placed in a 200 litre vessel which contains 2 moles of $N_{2}$ and is maintained at 600 K. The equilibrium pressure is 2.46 atm. The…2022 · 24 Jun · Shift 2 · Q16 · Numerical
The standard free energy change ( $Δ$ G $^{\circ}$ ) for 50% dissociation of $N_{2} O_{4}$ into $N O_{2}$ at 27 $^{\circ}$ C and 1 atm pressure is $-$ x J mol $-$ 1. The value of x is . (Nearest Integer) [Given : R = 8.31…2022 · 25 Jun · Shift 1 · Q19 · Numerical
At $298 K$ , the equilibrium constant is $2 \times 1 0^{15}$ for the reaction : $Cu (s) + 2 Ag^{+} (aq) ⇌ Cu^{2 +} (aq) + 2 Ag (s)$ The equilibrium…2022 · 26 Jul · Shift 1 · Q20 · Numerical
40% of $H I$ undergoes decomposition to $H_{2}$ and $I_{2}$ at 300 K. $Δ$ G $^{Θ}$ for this decomposition reaction at one atmosphere pressure is J mol $-$ 1. [nearest integer] (Use R = 8.31 J K $-$ 1 mol $-$ 1…2022 · 26 Jun · Shift 2 · Q20 · Numerical
2 $N O C l$ (g) $⇌$ 2 $N O$ (g) + $C l_{2}$ (g) In an experiment, 2.0 moles of $N O C l$ was placed in a one-litre flask and the concentration of $N O$ after equilibrium established, was found to be 0.4 mol/L. The equilibrium constant…2022 · 27 Jun · Shift 1 · Q13 · Numerical
At $600 K, 2 mol$ of $NO$ are mixed with $1 mol$ of $O_{2}$ . $2 NO_{(g)} + O_{2} (g) ⇄ 2 NO_{2} (g)$ The reaction occurring…2022 · 28 Jul · Shift 2 · Q17 · Numerical
A box contains 0.90 g of liquid water in equilibrium with water vapour at 27 $^{\circ}$ C. The equilibrium vapour pressure of water at 27 $^{\circ}$ C is 32.0 Torr. When the volume of the box is increased, some of the liquid water evaporates…2022 · 29 Jun · Shift 2 · Q14 · Numerical
4.0 moles of argon and 5.0 moles of $P C l_{5}$ are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was found to be 6.0 atm. The Kp for the…2022 · 29 Jun · Shift 2 · Q3 · MCQ
The equilibrium constant for the reversible reaction 2A(g) $⇌$ 2B(g) + C(g) is K1 $\frac{3}{2}$ A(g) $⇌$ $\frac{3}{2}$ B(g) + $\frac{3}{4}$ C(g) is K2. K1 and K2 are related as :2022 · 30 Jun · Shift 1 · Q3 · MCQ
For the reaction $A (g) ⇌ B (g)$ at 495 K, $Δ$ rG $^{\circ}$ = $-$ 9.478 kJ mol $-$ 1. If we start the reaction in a closed container at 495 K with 22 millimoles of A, the amount of B in the equilibrium mixture is …2021 · 16 Mar · Shift 1 · Q17 · Numerical
0.01 moles of a weak acid HA (Ka = 2.0 $\times$ 10 $-$ 6) is dissolved in 1.0 L of 0.1 M HCl solution. The degree of dissociation of HA is $\times$ 10 $-$ 5 (Round off to the Nearest Integer). [Neglect volume change…2021 · 17 Mar · Shift 1 · Q19 · Numerical
Consider the reaction $N_{2} O_{4} (g) ⇌ 2 N O_{2} (g)$ The temperature at which KC = 20.4 and KP = 600.1, is K. (Round off to the Nearest Integer). [Assume all gases are…2021 · 17 Mar · Shift 2 · Q17 · Numerical
The gas phase reaction $2 A (g) ⇌ A_{2} (g)$ at 400 K has $Δ$ Go = + 25.2 kJ mol-1. The equilibrium constant KC for this reaction is $\times$ 10 $-$ 2. (Round off to the Nearest Integer). [Use :…2021 · 18 Mar · Shift 2 · Q19 · Numerical
2 $S O_{2}$ (g) + $O_{2}$ (g) $⇌$ 2 $S O_{3}$ (g) In an equilibrium mixture, the partial pressures are $P S O_{3}$ = 43 kPa; $P O_{2}$ = 530 Pa and $P S O_{2}$ = 45 kPa. The equilibrium constant $K P$ = $\times$ 10 $-$ …2021 · 20 Jul · Shift 1 · Q16 · Numerical
Value of $K_{P}$ for the equilibrium reaction $N_{2} O_{4}$ (g) $⇌$ 2 $N O_{2}$ (g) at 288 K is 47.9. The $K_{C}$ for this reaction at same temperature is . (Nearest integer) (R = 0.083 L bar K $-$ 1 mol $-$ 1)2021 · 22 Jul · Shift 2 · Q19 · Numerical
The stepwise formation of $[C u (N H_{3})_{4}]^{2 +}$ is given below: The value of stability constants K1, K2, K3 and K4 are 104, 1.58 x 103, 5 x 102 and 102 respectively. The overall equilibrium constants… Includes diagram2021 · 24 Feb · Shift 1 · Q15 · Numerical
At 1990 K and 1 atm pressure, there are equal number of $C l_{2}$ , molecules and $C l$ atoms in the reaction mixture. The value of Kp for the reaction $C l_{2}$ (g) $⇌$ 2 $C l$ (g) under the above conditions is x $\times$ 10-1.…2021 · 24 Feb · Shift 1 · Q17 · Numerical
For the reaction A(g) $\to$ B(g) the value of the equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of $Δ$ rG for the reaction at 300 K and 1 atm in J mol-1 is – xR, where x is . (Rounded…2021 · 24 Feb · Shift 1 · Q21 · Numerical
For the reaction A + B $⇌$ 2C the value of equilibrium constant is 100 at 298 K. If the initial concentration of all the three species is 1 M each, then the equilibrium concentration of C is x $\times$ 10 $-$ 1 M. The…2021 · 25 Jul · Shift 1 · Q19 · Numerical
Assuming that $B a (O H)_{2}$ is completely ionised in aqueous solution under the given conditions the concentration of $H_{3} O^{+}$ ions in 0.005 M aqueous solution of $B a (O H)_{2}$ at 298 K is $\times$ 10 $-$ 12 mol L $-$ 1.…2021 · 25 Jul · Shift 2 · Q21 · Numerical
The $O H$ $-$ concentration in a mixture of 5.0 mL of 0.0504 M $N H_{4} C l$ and 2 mL of 0.0210 M $N H_{3}$ solution is x $\times$ 10 $-$ 6 M. The value of x is . (Nearest integer) [Given Kw = 1 $\times$ 10 $-$ 14 and Kb =…2021 · 26 Aug · Shift 1 · Q16 · Numerical
The equilibrium constant Kc at 298 K for the reaction A + B $⇌$ C + D is 100. Starting with an equimolar solution with concentrations of A, B, C and D all equal to 1M, the equilibrium concentration of D is …2021 · 26 Aug · Shift 2 · Q14 · Numerical
The reaction rate for the reaction $[P tC l_{4}]^{2 -}$ + $H_{2} O$ $⇌$ $[P t (H_{2} O) C l_{3}]^{-}$ + $C l^{-}$ was measured as a function of concentrations of different species. It was observed that $\frac{- d [ [ P tC l _{4} ] ^{2 -} ]}{d t} = 4.8 \times 1 0^{- 5} [[P tC l_{4}]^{2 -}] - 2.4 \times 1 0^{- 3} [[P t (H_{2} O) C l_{3}]^{-}] [C l^{-}]$ …2021 · 26 Aug · Shift 2 · Q21 · Numerical
A homogeneous ideal gaseous reaction $A B_{2 (g)} ⇌ A_{(g)} + 2 B_{(g)}$ is carried out in a 25 litre flask at 27 $^{\circ}$ C. The initial amount of $A B_{2}$ was 1 mole and the equilibrium pressure was 1.9 atm. The value…2021 · 26 Feb · Shift 1 · Q22 · Numerical
The number of moles of $N H_{3}$ , that must be added to 2 $L$ of 0.80 M $A g N O_{3}$ in order to reduce the concentration of $A g^{+}$ ions to 5.0 $\times$ 10 $-$ 8 M (Kformation for $[A g (N H_{3})_{2}]^{+}$ = 1.0 $\times$ 108) is .…2021 · 27 Aug · Shift 1 · Q21 · Numerical
When 5.1 g of solid $N H_{4} H S$ is introduced into a two litre evacuated flask at 27 $^{\circ}$ C, 20% of the solid decomposes into gaseous ammonia and hydrogen sulphide. The Kp for the reaction at 27 $^{\circ}$ C is x $\times$ 10 $-$ 2. The…2021 · 27 Aug · Shift 2 · Q20 · Numerical
$P C l_{5}$ $⇌$ $P C l_{3}$ + $C l_{2}$ Kc = 1.844 3.0 moles of $P C l_{5}$ is introduced in a 1 L closed reaction vessel at 380 K. The number of moles of $P C l_{5}$ at equilibrium is $\times$ 10 $-$ 3. (Round…2021 · 27 Jul · Shift 1 · Q21 · Numerical
The equilibrium constant for the reaction A(s) $⇌$ M(s) + $\frac{1}{2}$ $O_{2}$ (g) is Kp = 4. At equilibrium, the partial pressure of $O_{2}$ is atm. (Round off to the nearest integer)2021 · 27 Jul · Shift 2 · Q13 · Numerical
An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams of glucose are added to the beaker of water, the rate at which water molecules :2020 · 2 Sep · Shift 1 · Q14 · MCQ
For the equilibrium A ⇌ B , the variation of the rate of the forward (a) and reverse (b) reaction with time is given by :2020 · 4 Sep · Shift 1 · Q19 · MCQ
If the equilibrium constant for A ⇌ B + C is $K_{e q}^{(1)}$ and that of B + C ⇌ P is $K_{e q}^{(2)}$ , the equilibrium constant for A ⇌ P is :2020 · 4 Sep · Shift 2 · Q20 · MCQ
Consider the following reaction: $N_{2} O_{4}$ (g) ⇌ 2 $N O_{2}$ (g); $Δ$ Ho = +58 kJ For each of the following cases (a, b), the direction in which the equilibrium shifts is : (a) Temperature is decreased. (b) Pressure is increased by adding $N_{2}$ …2020 · 5 Sep · Shift 1 · Q11 · MCQ
For a reaction X + Y ⇌ 2Z , 1.0 mol of X, 1.5 mol of Y and 0.5 mol of Z were taken in a 1 L vessel and allowed to react. At equilibrium, the concentration of Z was 1.0 mol L–1. The equilibrium constant of reaction is $\frac{x}{15}$ . The…2020 · 5 Sep · Shift 2 · Q5 · Numerical
For the reaction $F e_{2} N$ (s) + $\frac{3}{2}$ $H_{2}$ (g) ⇌ 2Fe(s) + $N H_{3}$ (g)2020 · 6 Sep · Shift 1 · Q17 · MCQ
The variation of equilibrium constant with temperature is given below : The values of $Δ$ Ho, $Δ$ Go at T1 and $Δ$ Go at T2 (in kJ mol–1) respectively, are close to : [Use R = 8.314 J K–1 mol–1] Includes table2020 · 6 Sep · Shift 1 · Q7 · MCQ
The value of KC is 64 at 800 K for the reaction $N_{2}$ (g) + 3 $H_{2}$ (g) ⇌ 2 $N H_{3}$ (g) The value of KC for the following reaction is : $N H_{3}$ (g) ⇌ $\frac{1}{2}$ $N_{2}$ (g) + $\frac{3}{2}$ $H_{2}$ (g)2020 · 6 Sep · Shift 2 · Q14 · MCQ
In the figure shown below reactant A (represented by square) is in equilibrium with product B (represented by circle). The equilibrium constant is : Includes diagram2020 · 9 Jan · Shift 2 · Q18 · MCQ
For the following reactions, equilibrium constants are given : $S$ (s) + $O_{2}$ (g) ⇋ $S O_{2}$ (g); K1 = 1052 2 $S$ (s) + 3 $O_{2}$ (g) ⇋ 2 $S O_{3}$ (g); K2 = 10129 The equilibrium constant for the reaction, 2 $S O_{2}$ (g) + $O_{2}$ (g) ⇋ 2 $S O_{3}$ (g) is :2019 · 8 Apr · Shift 2 · Q22 · MCQ
Consider the following reversible chemical reactions : The relation between K1 and K2 is : Includes diagram2019 · 9 Jan · Shift 2 · Q6 · MCQ
For the reaction, 2 $S O_{2}$ (g) + $O_{2}$ (g) = 2 $S O_{3}$ (g), $Δ$ H = –57.2 kJ mol–1 and KC = 1.7 × 1016 Which of the following statement is incorrect ?2019 · 10 Apr · Shift 2 · Q10 · MCQ
The values of Kp/Kc for the following reactions at 300 K are, respectively : (At 300 K, RT = 24.62 dm3 atm mol–1) $N_{2}$ (g) + $O_{2}$ (g) $⇌$ 2 $N O$ (g) $N_{2} O_{4}$ (g) $⇌$ 2 $N O$ (g) $N_{2}$ (g) + 3 $H_{2}$ (g) $⇌$ …2019 · 10 Jan · Shift 1 · Q20 · MCQ
5.1 g $N H_{4} S H$ is introduced in 3.0 L evacuated flask at 327ºC. 30% of the solid $N H_{4} S H$ decomposed to $N H_{3}$ and $H_{2} S$ as gases . The Kp of the reaction at 327oC is (R = 0.082 L atm mol–1 K–1, Molar mass of S = 32 g mol–1 molar mass of…2019 · 10 Jan · Shift 2 · Q12 · MCQ
Consider the reaction $N_{2}$ (g) + 3 $H_{2}$ (g) $⇌$ 2 $N H_{3}$ (g) The equilibrium constant of the above reaction is Kp. If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by (Assume…2019 · 11 Jan · Shift 1 · Q2 · MCQ
In which one of the following equilibria, Kp $e$ KC ?2019 · 12 Apr · Shift 2 · Q1 · MCQ
The INCORRECT match in the following is :2019 · 12 Apr · Shift 2 · Q13 · MCQ
Two solids dissociate as follows – The total pressure when both the solids dissociated simultaneously is - Includes diagram2019 · 12 Jan · Shift 1 · Q1 · MCQ
In a chemical reaction, the initial concentration of B was 1.5 times of the concentration of A, but the equilibrium concentrations of A and B were found to be equal. The equilibrium constant (K) for the aforesaid chemical reaction is - Includes diagram2019 · 12 Jan · Shift 1 · Q4 · MCQ
In which of the following reactions, an increase in the volume of the container will favour the formation of products?2018 · 15 Apr · Shift 1 · Q23 · MCQ
At a certain temperature in a $5 L$ vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium according to the reaction, $C O$ + $C l_{2}$ $⇌$ $C O C l_{2}$ At equilibrium, if one mole of $C O$ is…2018 · 15 Apr · Shift 2 · Q18 · MCQ
The gas phase reaction 2 $N O_{2}$ (g) $\to$ $N_{2} O_{4}$ (g) is an exothermic reaction. The decomposition of $N_{2} O_{4}$ , in equilibrium mixture of $N O_{2}$ (g) and $N_{2} O_{4}$ (g), can be increased by :2018 · 16 Apr · Shift 1 · Q12 · MCQ
The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal : $F e_{2} O_{3}$ (s) + 3 $C O$ (g) $⇌$ 2 $F e$ (1) + 3 $C O_{2}$ (g) Using the Le Chatelier’s principle, predict which one of the following…2017 · 9 Apr · Shift 1 · Q15 · MCQ
A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in this vessel. Kp for this reaction is :2016 · 10 Apr · Shift 1 · Q15 · MCQ
The equilibrium constant at 298 K for a reaction A + B $⇋$ C + D is 100. If the initial concentration of all the four species were 1M each, then equilibrium concentration of D (in mol L–1) will be:2016 · Shift 0 · Q8 · MCQ
The standard Gibbs energy change at 300 K for the reaction 2A $⇋$ B + C is 2494.2 J. At a given time, the composition of the reaction mixture is [A] = 1/2, [B] = 2 and [C] = 1/2. The reaction proceeds in the: [R = 8.314…2015 · Shift 0 · Q6 · MCQ
For the reaction $S O_{2}$ (g) + $\frac{1}{2} O_{2} (g) ⇋$ $S O_{3}$ (g). if KP = KC(RT)x where the symbols have usual meaning then the value of x is: (assuming ideality)2014 · Shift 0 · Q5 · MCQ
The equilibrium constant (KC) for the reaction $N_{2}$ (g) + $O_{2}$ (g) $\to$ 2 $N O$ (g) at temperature T is 4 $\times$ 10–4. The value of KC for the reaction, $N O$ (g) $\to$ 1/2 $N_{2}$ (g) + 1/2 $O_{2}$ (g) at the same temperature is :2012 · Shift 0 · Q5 · MCQ
A vessel at 1000 K contains $C O_{2}$ with a pressure of 0.5 atm. Some of the $C O_{2}$ is converted into $C O$ on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is :2011 · Shift 0 · Q5 · MCQ
In aqueous solution the ionization constants for carbonic acid are K1 = 4.2 x 10–7 and K2 = 4.8 x 10–11 Select the correct statement for a saturated 0.034 M solution of the carbonic acid.2010 · Shift 0 · Q5 · MCQ
For the following three reactions a, b and c, equilibrium constants are given: a. $C O$ (g) + $H_{2} O$ (g) $⇋$ $C O_{2}$ (g) + $H_{2}$ (g) ; K1 b. $C H_{4}$ (g) + $H_{2} O$ (g) $⇋$ $C O$ (g) + 3 $H_{2}$ (g) ; K2 c. $C H_{4}$ …2008 · Shift 0 · Q5 · MCQ
The equilibrium constants KP1 and KP2 for the reactions X $⇋$ 2Y and Z $⇋$ P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total…2008 · Shift 0 · Q8 · MCQ
Phosphorus pentachloride dissociates as follows, in a closed reaction vessel $P C l_{5}$ (g) $⇋$ $P C l_{3}$ (g) + $C l_{2}$ (g) If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of $P C l_{5}$ is…2006 · Shift 0 · Q5 · MCQ
The equilibrium constant for the reaction $S O_{3}$ (g) $⇋$ $S O_{2}$ (g) + $\frac{1}{2}$ $O_{2}$ (g) is Kc = 4.9 $\times$ 10–2. The value of Kc for the reaction 2 $S O_{2}$ (g) + $O_{2}$ (g) $⇋$ 2 $S O_{3}$ (g) will be :2006 · Shift 0 · Q6 · MCQ
An amount of solid $N H_{4} H S$ is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. Pressure. Ammonium hydrogen sulphide decomposes to yield $N H_{3}$ and $H_{2} S$ gases in the flask. When the decomposition…2005 · Shift 0 · Q1 · MCQ
The exothermic formation of $C l F_{3}$ is represented by the equation: $C l_{2}$ (g) + 3 $F_{2}$ (g) $⇋$ 2 $C l F_{3}$ (g); $Δ H$ = -329 kJ Which of the following will increase the quantity of $C l F_{3}$ in an equilibrium mixture of…2005 · Shift 0 · Q7 · MCQ
For the reaction 2 $N O_{2}$ (g) $⇋$ 2 $N O$ (g) + $O_{2}$ (g), (Kc = 1.8 $\times$ 10-6 at 184oC) (R = 0.0831 kJ/(mol. K)) When Kp and Kc are compared at 184oC , it is found that :2005 · Shift 0 · Q8 · MCQ
What is the equilibrium expression for the reaction $P_{4}$ (s) + 5 $O_{2}$ $⇋$ $P_{4} O_{10}$ (s)?2004 · Shift 0 · Q4 · MCQ
For the reaction, $C O$ (g) + $C l_{2}$ (g) $⇋$ $C O C l_{2}$ (g) the $\frac{K _{p}}{K _{c}}$ is equal to :2004 · Shift 0 · Q5 · MCQ
The equilibrium constant for the reaction $N_{2}$ (g) + $O_{2}$ (g) $⇋$ 2 $N O$ (g) at temperature T is 4 $\times$ 10-4. The value of Kc for the reaction $N O$ (g) $⇋$ $\frac{1}{2}$ $N_{2}$ (g) + $\frac{1}{2}$ $O_{2}$ …2004 · Shift 0 · Q6 · MCQ
Consider the reaction equilibrium 2 $S O_{2}$ (g) + $O_{2}$ (g) $⇋$ 2 $S O_{3}$ (g); $Δ H^{o}$ = -198 kJ One the basis of Le Chatelier's principle, the condition favourable for the forward reaction is :2003 · Shift 0 · Q8 · MCQ
For the reaction equilibrium $N_{2} O_{4}$ (g) $⇋$ 2 $N O_{2}$ (g) the concentrations of $N_{2} O_{4}$ and $N O_{2}$ at equilibrium are 4.8 $\times$ 10-2 and 1.2 $\times$ 10-2 mol L-1 respectively. The value of Kc for the reaction is2003 · Shift 0 · Q9 · MCQ
Change in volume of the system does not alter which of the following equilibria?2002 · Shift 0 · Q8 · MCQ
For the reaction $C O$ (g) + (1/2) $O_{2}$ (g) $⇋$ $C O_{2}$ (g), Kp/Kc is :2002 · Shift 0 · Q9 · MCQ