% hydrolysis of 0.1M CH₃COONH₄ when K_a = K_b = 1.8 x 10^-5 is

(a) 55 x 10^-2            (b) 0.55            (c) 7.63             (d) 1.8 x 10^-4

Which of the following system is not a buffer system?

(a) NH₃ and NH₄NO₃                  (b) Na₂HPO₄ and NaH₂PO₄

(c) KNO₂ and HNO₂                    (d) KHSO₄ and H₂SO₄

The weight of CH₃COONa needed to add in 1 litre N/10 CH₃COOH to obtain a buffer solution of pH value 4 is (Given K_a = 1.8 x 10^-5)

A dilute HCl solution saturated with H₂S has pH value 3 then the concentration of S^2- is (Given K₁ = 1 x 10^-7, K₂ = 1.3 x 10^-13)

(a) 2 x 10^-13 M           (b) 2.4 x 10^-13 M       (c) 3 x 10^-15         (d) 1.3 x 10^-15 M

Which is the strongest acid?

(a) H₃AsO₄           (b) H₂AsO₄^–            (c) HAsO₄^2-           (d) AsO₄^3-

In an aqueous solution of triprotic acid H₃A, which is true?

(a) [H⁺] = 3[A^3-]         (b) [H⁺] > 3[A^3-]

(c) [H⁺] < 3[A^3-]         (d) [H⁺] = [OH^–]

If K₁ and K₂ be first and second ionization constant of H₃PO₄ and K₁ >> K₂, which is incorrect?

(a) [H⁺] = [H₂PO₄^–]          (b) [H⁺] =

(c) K₂ = [HPO₄^2-]             (d) [H⁺] = 3[A₃^–]

If the ionic product of water varies with temperature as follows and the density of water be nearly constant for this range of temperature, the process H⁺ + OH^– ⇌ H₂O is

When equal volumes of following solution are mixed, precipitation of AgCl (K_sp = 1.8 x 10^-10) will occur only with

(a) 10^-4M ; Ag⁺ and 10^-4M ; Cl^–                 (b) 10^-5M ; Ag⁺ and 10^-5M ; Cl^–

(c) 10^-6M ; Ag⁺ and 10^-6M ; Cl^–                 (d) 10^-10M ; Ag⁺ and 10^-10M ; Cl^–

When ionic hydrides react with water, the products are

NH₄NO₃ will be maximum soluble in

(a) HCOOH + HCOONa buffer                      (b) NH₄OH + NH₄Cl buffer

(c) H₂OPO^–₄ + H₃PO₄ buffer                          (d) In pure water

With increasing temperature K_W values increases. So which of the following statement is true?

(a) H₂O → H⁺ + ^–OH this reaction is exothermic in nature

(b) Water is a strong electrolyte

(c) With increase of temperature pH of pure water increases

(d) Dissociation of water into H⁺ and OH^– is an endothermic process

Buffer capacity of maximum

Which of the following is false at half neutralization point of an acidic buffer solution?

10 c.c. of a 0.1M NaOH solution is added to 50 c.c. of a 1.1M acetic acid solution. What will be the pH of the resulting solution ? [K_a = 1.8 x 10^-5]