Question

Which of the following sets of compounds correctly illustrates the law of reciprocal proportions?

• A. $P_2{O}_3,P{H}_3,H_{2}O$
• B. $P_2{O}_5,P{H}_3,H_{2}O$
• C. $N_2{O}_5,N{H}_3,H_{2}O$
• D. $N_{2}O,N{H}_3,H_{2}O$

Answer 1

The correct option is A $P_2{O}_3,P{H}_3,H_{2}O$

The ratio of number of hydrogen and oxygen combining with one $P$ is $3:1.5$ i.e., $2:1$. It is same as in water $(2:1)$.