Chemistry Question Bank

Assertion : For a reversible reaction, Gibbs’ free energy is zero at equilibrium. Reason : As reaction approaches equilibrium, Gibbs’ free energy decreases.

Assertion : If some PCl5(g) containing labelled phosphorus P31 is added to a system with following equilibrium, after sometime the system was found to contain radioactive PCl3. PCl (g) PCl (g) Cl (g) Reason : Chemic…

Assertion : For a reaction at equilibrium, the free energy for the reaction is minimum. Reason : The free energy for both reactants and products decreases and become equal.

In a 1.0 L aqueous solution when the reaction (aq) (s) 2 Ag Cu (aq) (s) Cu 2 Ag reaches equilibrium, [Cu2+] = x M and [Ag+] = y M. If the volume of solution is doubled by adding water, then at equilibrium : (a) x …

Variation of log K with 1 T is shown by the following graph. Hº for the reaction will be :

In each of the following, total pressure set-up at equilibrium is assumed to be equal and is one atm with equilibrium constants KP given : I :CaCO3 (s) CaO (s) + CO2 (g), K1 II : NH4HS (s) NH3 (g) + H2S (g), K2 III :…

For the chemical equilibrium, CaCO (s) CaO(s) CO (g) , Hº can be determined from which one of the following graphs ? (a) (b) (c) (d)

If for the heterogeneous equilibrium CaCO3(s) CaO(s) + CO2 (g) ; K = 1 at 1 atm, the temperature is given by : (a) Sº T Hº (b) Hº T Sº (c) Gº T R (d) Gº T Hº

In reversible reaction k k A B , the initial concentration of A and B are a and b in moles per litre and the equilibrium concentration are (a – x) and (b + x) respectively ; express x in terms of k1, k2, a and b. (a…

For the all gas reaction at 1000 K : 2HI H2 + I2, K = 0.0344. If you were to begin with 8.0 M of HI in a fixed volume container, what would be the equilibrium concentration of H2 ?

Consider the reaction NaBr(aq) + H2SO4(aq) NaHSO4(aq) + HBr(aq). The equilibrium constant is 8.3 × 10 –2. If the equilibrium concentrations of NaBr, H2SO4 and NaHSO4 are 6.0 M, 9.0 M and 3.0 M respectively, what is th…

When A2 and B2 are allowed to react, the equilibrium constant of the reaction at 27ºC is found (Kc = 4). A2(g) + B2(g) 2AB(g) What will be the equilibrium concentration of AB ?

I I I This reaction is set-up in aqueous medium. We start with 1 mol of I2 and 0.5 mol of I– in 1L flask. After equilibrium is reached, excess of AgNO3 gave 0.25 mol of yellow ppt. Equilibrium constant is : [Given…

N2O4 2NO2, Kc = 4. This reversible reaction is studied graphically as shown in the given figure. Select the correct statement out of I, II and III. I : Reaction quotient has maximum value at point A II : Reaction proc…

N2(g) + 3H2(g) 2NH3(g) Initially the molar ratio of N2 and H2 was 1 : 3. At equilibrium, 50% of each has reacted. If the equilibrium pressure is P, the partial pressure of NH3 at equilibrium is:

Given : Reaction Equilibrium constant N2(g) + 3H2(g) 2NH3(g) K1 N2(g) + O2(g) 2NO(g) K2 H (g) O (g) H O(g) K3 The equilibrium constant K4 for the following reaction 2NH (g) O (g) 2NO(g) 3H …

3O2 (g) ⇌ 2O3(g) for the above reaction at 298 K, Kc is found to be 3.0 × 10-59. If the conc. of O2 at equilibrium is 0.040 M then concentration of O3 in M is. (NEET 2022)

Hydrolysis of sucrose is given by the following reaction : Sucrose H O Glucose Fructose If the equilibrium constant (KC) is 2 10 x at 300 K, the value of o rG at the same temperature will be (NEET 2020) (a) 8.3…

Which one of the following conditions will favour maximum formation of the product in the reaction, A2 (g) + B2 (g) X2 (g); rH = – X kJ? (NEET 2018)

A 20 litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the contain…

The equilibrium constants of the following are N 3H 2NH ;K N O 2NO;K H O H O;K The equilibrium constant (K) of the reaction : K 2NH O 2NO 3H O will be (NEET 2017) (a) K K K (b) K K K (c) K K K (d) K K K

Which of the following statements is correct for a reversible process in a state of equilibrium? (NEET 2015) (a) o G 2.30RT log K (b) o G 2.30 RT log K

If the value of equilibrium constant for a particular reaction is 1.6 10 x , then at equilibrium the system will contain (NEET 2015)

If the equilibrium constant for 2 g 2 g g N O 2NO is K, the equilibrium constant for 2 g 2 g g N O NO will be (NEET 2015)

Which of the following statement is correct for a reversible process in a state of equilibrium ? (AIPMT 2015) (a) G = 2.30 RT log K (b) o G = –2.30 RT log K (c) o G = 2.30 RT log K (d) G = – 2.30 RT log K