Question

Zinc pieces are added to acidified solution of ${SO}_3^{2-}$. Gas liberated can :

• A. turn lead acetate paper black.
• B. turn lime water milky.
• C. give both of the above tests.
• D. give none of these tests.

Answer 1

The correct option is A turn lead acetate paper black.

Zinc reacts with acidified solution of sulphite to liberate hydrogen sulphide gas.
Hydrogen sulphide gas turns lead acetate paper black.
$3Zn+S{O}_3^{2+}+2H^{+}\to 3ZnO+H_{2}S\uparrow$