Question

A rotten egg smell gas which is acidic in nature is Hydrogen sulphide gas.
A. True
B. False

Answer 1

Hydrogen sulphide gas reacts with bases such as sodium hydroxide to form salt and water. Hydrogen sulphide gas has a characteristic smell.

Complete answer:
Hydrogen sulphide gas is a colourless, corrosive and toxic gas. It is highly flammable gas. The chemical symbol of hydrogen sulphide gas is ${{\text{H}}_{\text{2}}}{\text{S}}$. Hydrogen sulphide gas is obtained through reaction of sulphides with metals.
Hydrogen sulphide gas reacts with sulphuric acid to form sulphur, sulphur dioxide and water. In aqueous solution, hydrogen sulphide gas dissociates to provide sulphide ions. These sulphide ions combine with Pb(II) ions to form a black precipitate of lead sulphide. Hence, when you dip lead(II) ethanoate paper in the aqueous solution of hydrogen sulphide, it will become black. You can use this test to detect the presence of hydrogen sulphide gas.
Hydrogen sulphide gas is acidic in nature as it turns moist blue litmus paper red and reacts with alkali such as sodium hydroxide to form salt such as sodium sulphide.
Hydrogen sulphide gas has a rotten egg smell.
Hence, the given statement is a true statement.

**The correct option is option (A), the given statement is True.

Note:**
To prepare hydrogen sulphide, you can carry out the reaction between ferrous sulphide and hydrogen chloride. Ferrous chloride is the by-product.