Equilibrium

Which of the following molecules acts as a Lewis acid?

1. (CH3)2O
2. (CH3)3P
3. (CH3)3N
4. (CH3)3B

The ionization constant of ammonium hydroxide is 1.77 10-5 at 298 K. Hydrolysis constant of ammonium chloride is

1. 6.50 10-12
2. 5.65 10-13
3. 5.65 10-12
4. 5.65 10-10

What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2?

1. 0.40 M
2. 0.0050 M
3. 0.12 M
4. 0.10 M

The dissociation equilibrium of a gas AB2 can be represented as: 2AB2(g) 2AB(g) + B2(g) The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant Kp and total pressure P is

1. (2Kp/P)1/2
2. (Kp/P)
3. (2Kp/P)
4. (2Kp/P)1/3

If the concentration of OH- ions in the reaction Fe(OH)3(s) Fe3+(aq) + 3OH-(aq) is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increase by

1. 64 times
2. 4 times
3. 8 times
4. 16 times

Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture?

1. 3.7 10-3 M
2. 1.11 10-3 M
3. 1.11 10-4 M
4. 3.7 10-4 M

The value of equilibrium constant of the reaction HI(g) 12H2(g) + 12I2(g) is 8.0. The equilibrium constant of the reaction H2(g) + I2(g) 2HI(g) will be

1. 16
2. 1/8
3. 1/16
4. 1/64

The values of Kp for the reactions, X Y + Z ....(i) A 2B ....(ii) are in the ratio 9 : 1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (i) and (ii) are in the ratio

1. 36 : 1
2. 1 : 1
3. 3 : 1
4. 1 : 9

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

1. MgCl2
2. CaCl2
3. SrCl2
4. BaCl2

Which one of the following ionic species has the greatest proton affinity to form stable compound?

1. NH2-
2. F-
3. I-
4. HS-