Equilibrium · Question 5

Phosphoric acid ionizes in three steps with their ionization constant values Ka1, Ka2 and Ka3, respectively, while K is the overall ionization constant. Which of the following statements are true? Choose the correct answer from the options given below :

1. B, C and D only
2. A, B and C only
3. A and B only
4. A and C only

Higher yield of NO in N2(g) + O2(g) 2NO(g) can be obtained at [ H of the reaction = +180.7 kJ mol-1] Choose the correct answer from the options given below :

1. B, C, D only
2. A, C, D only
3. A, D only
4. B, C only

In which of the following equilibria, Kp and Kc are NOT equal?

1. PCl5(g) PCl3(g) + Cl2(g)
2. H2(g) + I2(g) 2HI(g)
3. CO(g) + H2O(g) CO2(g) + H2(g)
4. 2BrCl(g) Br2(g) + Cl2(g)

For the reaction 2A B + C, Kc = 4 10-3. At a given time, the composition of reaction mixture is: [A] = [B] = [C] = 2 10-3 M. Then, which of the following is correct?

1. Reaction is at equilibrium.
2. Reaction has a tendency to go in forward direction.
3. Reaction has a tendency to go in backward direction.
4. Reaction has gone to completion in forward direction.

Consider the following reaction in a sealed vessel at equilibrium with concentrations of N2 = 3.0 10-3 M, O2 = 4.2 10-3 M and NO = 2.8 10-3 M. 2NO(g) N2(g) + O2(g) If 0.1 mol L-1 of NO(g) is taken in a closed vessel, what will be degree of dissociation ( ) of NO(g) at equilibrium?

1. 0.00889
2. 0.0889
3. 0.8889
4. 0.717

At a given temperature and pressure, the equilibrium constant values for the equilibria are given below: 3A2 + B2 2A3B, K1 A3B 32A2 + 12B2, K2 The relation between K1 and K2 is :

1. K12 = 2K2
2. K2 = K12
3. K1 = 1 K2
4. K2 = 1 K1

For the reaction in equilibrium N2(g) + 3H2(g) 2NH3(g), H = -Q Reaction is favoured in forward direction by:

1. use of catalyst
2. decreasing concentration of N2
3. low pressure, high temperature and high concentration of ammonia
4. high pressure, low temperature and higher concentration of H2

The ratio of solubility of AgCl in 0.1 M KCl solution to the solubility of AgCl in water is: (Given : Solubility product of AgCl = 10-10)

1. 10-4
2. 10-6
3. 10-9
4. 10-5

Amongst the given options which of the following molecules/ion acts as a Lewis acid?

1. H2O
2. BF3
3. OH-
4. NH3

The equilibrium concentrations of the species in the reaction A + B C + D are 2, 3, 10 and 6 mol L-1, respectively at 300 K. G for the reaction is (R = 2 cal/mol K)

1. -137.26 cal
2. -1381.80 cal
3. -13.73 cal
4. 1372.60 cal