Question

Aqueous solution of ammonium sulphate:

• A. turns blue litmus to red
• B. turns red litmus to blue
• C. bleaches litmus
• D. has no action on litmus

Answer 1

The correct option is A turns blue litmus to red

$(N{H}_4{)}_{2}S{O}_4$ is a salt of strong acid and weak base.

$(N{H}_4{)}_{2}S{O}_4\to 2N{H}_4^{+}+S{O}_4^{2-}$

$N{H}_4^{+}+H_{2}O\to N{H}_{4}OH+H^{+}$

Generation of $H^{+}$ makes the solution acidic, therefore it turns blue litmus red.