Question

Solution of potash alum is acidic in nature. This is due to hydrolysis of

(a) SO^2-₄

(b) K⁺

(c) Al₂ (SO₄)₃

(d) Al³⁺

Answer 1

Correct option: (a) SO^2-₄ 

Explanation:

Al₂ (SO₄ ) ₃ is a salt of weak base and a strong acid hence on hydrolysis it will 

produce Al(OH)₃ and H₂ SO₄ . Since H₂ SO₄ is a strong acid and Al(OH)₃ is is a weak base hence the solution will be acidic due to SO₄ ^––