Question

Choose the correct answer from the choices - The gas evolved when dil. sulphuric acid reacts with iron sulphide.

• A. Sulphur dioxide
• B. Sulphur trioxide
• C. Hydrogen sulphide
• D. Vapour of sulphuric acid

Answer 1

The correct option is C Hydrogen sulphide

$\text{Correct answer: (A) Hydrogen sulphide}$

• When ferrous sulphide $\left(FeS\right)$ reacts with sulphuric acid, hydrogen sulphide $\left(H_{2}S\right)$ gas is obtained.

$FeS+H_{2}S{O}_4\to FeS{O}_4+H_{2}S\uparrow$