Chemistry Question Bank

p K and p K are the equilibrium constants of the two reactions, given below (AMU 2009) N g H g NH g N g 3H g 2NH g Therefore p K and p K are related by (a) p p K K (b) p p K K (c) p p K 2K (d) p p K K

2HI g H g I g The equilibrium constant of the above reaction is 6.4 at 300 K. If 0.25 mole each of H and 2I are added to the system, the equilibrium constant will be (KCET 2009)

5 moles of SO and 5 moles of O are allowed to react. At equilibrium, it was found that 60% of SO is used up. If the total pressure of the equilibrium mixture is one atmosphere, the partial pressure of is (KCET 2009)

Three moles of PCl , three moles of PCl and two moles of Cl are taken in a closed vessel. If at equilibrium the vessel has 1.5 moles of PCl , the number of moles of PCl present in it is (KCET 2008)

For the reaction C(s) CO (g) 2CO(g) The partial pressure of CO and CO are 2.0 and 4.0 atm respectively then equilibrium p K for the reaction will be (BCECE 2008)

Equimolar concentrations of H and I are heated to equilibrium in a 2 L flask. At equilibrium, the forward and the backward rate constants are found to be equal. NH N NH What percentage of initial concentration of H …

In the equilibrium 2NH N 3H , 6 moles of is taken in 10 L flask. If concentration of at equilibrium is x, then concentration of at equilibrium is (DUMET 2008)

Now, the total pressure at equilibrium, p(1 α)+pα+0.5pα = P P p = ...(2) 1+0.5α From eq (1) and eq(2), p P P P K 0.5 1 + 0.5α K P 0.5 2K P x x

The dissociation equilibrium of a gas AB can be represented as 2AB (g) 2AB(g) B (g) The degree of dissociation is ‘x’ and is small compared to 1. The expression relating the degree of dissociation (x) with equilibr…

If the concentration of OHions in the reaction Fe OH s Fe aq 3OH aq is decreased by 4 times, the equilibrium concentration of Fe will increase by (CBSE AIPMT 2008)

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…