On reaction with dilute

CHEMISTRY · Single correct · GCSE · Chemistry · Chemical Analysis · Chemical Analysis

Problem

\text{H}_2\text{SO}_4

, which of the following salts will give out a gas that turns an acidified dichromate paper green ? (1)

\text{Na}_2\text{CO}_3

(2)

\text{Na}_2\text{S}

(3)

\text{ZnSO}_3

(4) FeS