Which of the following statements indicates that law of multiple proportion is being followed?

Options

A. An element forms two oxides, XO and `XO_2` containing 50% and 60% oxygen respectively. The ratio of masses of oxygen which combines with 1 g of element is 2 : 3.
B. Hydrogen sulphide contains 5.89% hydrogen, water contains 11.1% hydrogen and sulphur dioxyde contains 50% oxygen.
C. 3.47 g of `BaCl_2` reacts with 2.36g of `Na_2SO_4` to give 3.88 of `BaSO_4` and 1.95 g of NaCl.
D. 20mL of ammonia gives 10 volumes of `N_2` and 30 volumes of `H_2` at constant temperature and pressure.

Answer

A

Explanation

In XO, 50g of element combine with 50g of oxygen.
`therefore` 1g of element combines with 1g of oxygen.
In `XO_2`, 40 g of element combines with 60g of oxygen.
`therefore` 1g of element combines with 1.5 g of oxygen.
Thus, ratio of masses of oxygen which combines with 1g of element is 1:1.5 or 2:3. This is in accordance with the law of multiple proportions . In (b) law of reciprocal of propotions is followed. In (c) law of conservation of mass is followed while in (d) Avogadro's law is followed.