Question

Element $P,Q$ react to form a compound $P_x{Q}_y.R$ and $P$ react to form $R_y{P}_z$. If $P_x{Q}_y$ is a binary acid with $x=2y$ then the acid is:

• A. sulphuric acid
• B. hydrochloric acid
• C. chloric acid
• D. hydrogen sulphide

Answer 1

The correct option is D hydrogen sulphide

$P_x{Q}_y$ is binary acid and $x=2y$

$\Rightarrow P_{2y}{Q}_y$ (or) $P_{2}Q.$

From the given compound, it must be $H_{2}S$ i.e. Hydrogen sulphide.