Question

The correct order of increasing [H₃O⁺] in the following aqueous solutions is

(a) 0.01 M H₂S < 0.01 M H₂SO₄ < 0.01 M NaCl<0.01 MNaNO₂

(b) 0.01 M NaCl < 0.01 M NaNO₂ < 0.01 M H₂S<0.01 MH₂SO₄

(c) 0.01 M NaNO₂ < 0.01 M NaCl < 0.01 M H₂S< 0.01 M H₂SO₄

(d) 0.01 M H₂S < 0.01 M NaNO₂ < 0.01 M NaCl < 0.01 M H₂SO₄

Answer 1

Correct option  (c) 0.01 M NaNO₂ < 0.01 M NaCl < 0.01 M H₂S< 0.01 M H₂SO₄

Explanation:

H₂SO₄ is strong acid having pH < 7.NaNO₂ on hydrolysis gives alkaline solution of pH > 7. NaCl is neutral and H₂S is weak acid.