Chemistry Question Bank

Assertion For the reaction, N (g) 3H (g) 2NH (g) Unit of Kc = L2 mol–2 Reason For the reaction N (g) 3H (g) 2NH (g) Equilibrium constant, c [NH ] K [N ][H ] (AIIMS 2008)

In which of the following reactions, the concentration of the product is higher than the concentration of reactant at equilibrium? (K = equilibrium constant) (AIIMS 2008)

Reaction BaO (s) BaO(s) O (g); H ve. In equilibrium condition, pressure of O depends on (PUNJAB PMET 2007)

For the reaction r –1 CH (g) 2O (g) CO (g) 2H O( ); H 170.8 kJ mol l (CBSE AIPMT 2006) Which of the following statements is not true ?

CaCO CaO CO reaction in lime kiln goes to completion because (AFMC 2005)

In the reaction, A(s) B(g) heat 2C(s) 2D(g) at equilibrium, pressure of B is doubled to re- establish the equilibrium. The factor by which concentration of D is changed, is (PMT2005) (a)

Equilibrium constant K1 and K2 for the following equilibria (AIPMT 2005) K NO(g) O NO (g) K 2NO (g) 2NO(g) O (g) are related as (a) K K (b) K K (c) K K (d) K K Ans. (d) Sol. Reaction (2) is a reverse reactio…

Of the following which change will shift the reaction towards the product? (AIIMS 2004) o r I g 2I g , H 298K 150kJ

The reaction (g) (g) (g) N O 2NO is endothermic. The forward reaction is (BHU 2003)

The reaction quotient (Q) for the reaction N (g) 3H (g) 2NH (g) is given by [NH ] Q . [N ][H ] (CBSE Med. 2003) The reaction will proceed from right to left if

If N2 + 3H2 2 NH3 – K, then 2N2 + 6H2 4NH3 – ? (PMT 2002)

When H2 and I2 are mixed and equilibrium is attained, then H I 2HI (PMT 2002)

The equilibrium SO2Cl2 (g) SO2 (g) + Cl2 (g) is attained at 25ºC in a closed container and an inert gas, helium is introduced. Which of the following statement is correct ? (PMT 2000)

Which of the following equilibria will shift to right side on increasing the temperature ? (PMT 2000)

Consider the following equilibria for gases : H2S(g) H2S(aq) + 4.6 Kcal ; SO2(g) SO2(aq) + 8.6 Kcal. Assuming the randomness factor to be about the same for each, which of the gases will have the lower solubility in…

When a liquid in equilibrium with its vapour is heated

Densities of diamond and graphite are 3.5 and 2.3 g/mL respectively. Increase of pressure on the equilibrium C (diamond) C (graphite)

In the equilibrium reaction AgCl(s) + 2NH3(g) 3 2 Ag(NH ) (aq) Cl (aq), an increase in the concentration of Cl –(aq) causes

The volume of the reaction vessel containing an equilibrium mixture is increased, while holding the temperature constant for the following reaction : SO2Cl2(g) SO2(g) + Cl2(g) When equilibrium is re-established, which…

For the reaction, A B + C, at equilibrium, the concentration of A is 1 × 10–3 M, B is 0.15 and C is 0.05 M. The Gº for the hydrolysis of A at 27ºC will be :

The free energy of formation of NO is 78 kJ mol–1 at the temperature of an automobile engine (1000 K). What is the equilibrium constant for this reaction at 1000 K ? N (g) O (g) NO(g)

A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted to CO on addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is :

For a reversible reaction : A + B C dx dt = 2.0 × 103 L mol–1 s–1 [A] [B] – 1.0 × 102 s–1 [C] where x is the amount of ‘A’ dissociated. The value of equilibrium constant (Keq) is :

The standard state Gibb’s free energy change for the isomerization reaction cis-2-pentene trans-2-pentene is –3.67 kJ mol–1 at 400 K. If more trans-2-pentene is added to the reaction vessel

Consider the reaction PCl5 (g) PCl3 (g) + Cl2 (g) in a closed container at equilibrium. At a fixed temperature what will be the effect of adding more PCl5 on the equilibrium concentration of Cl2 (g) ?