Question

Which of the following statements illustrates the law of multiple proportions?

• A. An element forms two oxides, XO and $X{O}_2$ 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 dioxide contains $50\%$ oxygen.
• C. 3.47 g of $BaC{l}_2$ reacts with 2.36 g of $N{a}_{2}S{O}_4$ to give 3.88 g of $BaS{O}_4$ and 1.95 g of NaCl.
• D. 20 mL of ammonia gives 10 volumes of $N_2$ and 30 volumes of $H_2$ at constant temperature and pressure

Answer 1

The correct option is A An element forms two oxides, XO and $X{O}_2$ containing $50\%$ and $60\%$ oxygen respectively. The ratio of masses of oxygen which combines with 1 g of element is 2:3

Law of multiple proportions states that when two elements combine to form two or more compounds, the masses of one element which combine with the fixed mass of another element, will always be in ratio of whole numbers.

The statement is :

An element forms two oxides $XO$ and ${XO}_2$ containing $50$% and $60$% of oxygen respectively. The ratio of masses of $O_2$ which combine with $1g$ of element of $2:3$.