Chemistry - Complete P-block Question with Solution | TestHub

In the laboratory, hydrogen sulfide (H₂S) is produced in a Kipp's apparatus through the reaction of a dilute acid with a metal sulfide. The solid substance labeled (A) is iron(II) sulfide (FeS), which reacts with dilute sulfuric acid (H₂SO₄) at room temperature to release the gas. The chemical reaction is represented as:

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

FeS is the preferred choice because it reacts efficiently without heating, providing a steady supply of gas for experiments. Consequently, the correct option is (A) FeS.