Equilibrium · Question 104

At 298 K, a certain buffer solution contains equal concentrations of X- and HX. Kb for X- is 10-10. What is the pH of this buffer solution?

1. 10
2. 4
3. 2
4. 6

Given below are certain reactions. Identify the reaction for which Kp Kc.

1. N2(g) + O2(g) 2NO(g)
2. H2O(g) + CO(g) H2(g) + CO2(g)
3. N2(g) + 3H2(g) 2NH3(g)
4. H2(g) + I2(g) 2HI(g)

In a qualitative analysis, Bi3+ is detected by appearance of precipitate of BiO(OH)(s). Calculate pH when the following equilibrium exists at 298 K : BiO(OH)(s) BiO+(aq) + OH-(aq), K = 4 × 10-10 (Given : log 2 = 0.3010)

1. 4.699
2. 5.286
3. 8.714
4. 9.301

The correct order of solubility of the given salts in water at 298 K is array|l|l| Salt & Ksp at 298 K \ AgBr & 5.0 10-13 \ Zn(OH)2 & 1.0 10-15 \ Hg2Cl2 & 1.3 10-18 \ array

1. Zn(OH)2 > AgBr > Hg2Cl2
2. Hg2Cl2 > Zn(OH)2 > AgBr
3. AgBr > Zn(OH)2 > Hg2Cl2
4. Hg2Cl2 > AgBr > Zn(OH)2

For the reaction A(g) 2B(g), the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500, at 1000 K. [Given : R = 0.0831 L atm mol-1 K-1] Kp for the reaction at 1000 K is

1. 0.033
2. 0.021
3. 83.1
4. 2.077 105

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