Chemical And Ionic Equilibrium Test Online

1. The pH of a solution having the H⁺ ion concentration of 1 x 10⁻⁴ ions/liter is:

2. Of the following which change will shift the reaction towards the product? I₂(g) ⇌ 2I(g), ∆H⁰_r (298 K) = + 150 kJ

3. pK_a value of four acids are given below. The strongest acid is:

4. Solubility product of a salt AB is 1 x 10⁻⁸ in a solution in which the concentration of A⁺ ions is 10⁻³ M. The salt will precipitate when the concentration of B⁻ ions is kept

5. One mole of CH₃COOH and one mole of C₂H₅OH reacts to produce 2/3 mol of CH₃COOC₂H₅. The equilibrium constant is:

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

7. The value of K_p for the reaction: 2H₂S_(g) = 2H₂ _(g) + S₂ _(g) is 1.2 x 10⁻² at 1065°C. The value for K_C is:

8. A weaqk acid, HA is found to be 10% ionized in 0.01 M aqueous solution. Calculate the pH of a solution which is 0.1 M in HA and 0.05 M in NaA.

9. During titration of acetic acid with aq. NaOH solution, the neutralisation graph has a vertical line. This line indicates

10. The pH of solution containing 0.01 M sodium acetate and 0.03 M acetic acid is (pK_a for CH₃COOH = 4.57)

11. The equilibrium constant for the following reaction will be: 3A + 2B → C.

12. When 10 mL of 0.1 M acetic acid (pK_a = 5.0), is titrated against 10 mL of 0.1 M ammonia solution (pK_b = 5.0), the equivalence point occurs at pH:

13. The solubility of PbF₂ in water at 25°C is ~ 10⁻³ M. What is its solubility in 0.05 M NaF solution? Assume the later to be fully ionised.   

14. Air containing 79% of nitrogen and 21% of oxygen by volume is heated at 2200 K and 1 atm until equilibrium is established according to the reaction  N₂(g) + O₂(g) ⇌ 2NO(g) If the K_p of the reaction is 1.1 x 10⁻³, calculate the amount of nitric oxide produced in terms of volume percent.

15. In the manufacture of NH₃ in Haber’s continuous flow process involving the reaction N₂_(g) + 3H₂_(g)        2NH₃_(g),∆H = -22.08 kcal. The favourable conditions are: