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

Options

A. Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 : 2
B. Carbon forms two oxides namely ` CO_(2)` and , CO where masses of oxygen which combine with fixed mass of carbon are in the sample ratio 2 : 1
C. When magnesium burns in oxygen, the amount of magnesium taken for the reaction is equal to the amount of magnesium in magnesium oxide formed
D. At constant temperature and pressure mL 200 of hydrogen will combine with mL 100 oxygen to produce mL 200 of water vapour

Answer

B

Explanation

The element carbon, combines with oxygen to form two compounds, namely, carbon dioxide and carbon monoxide. In `CO_(2)`, 12 parts by mass of carbon combine with 32 parts by mass of oxygen while in CO , 12 parts by mass of carbon combine with 16 parts by mass of oxygen.
Therefore, the masses of oxygen combine with a fixed mass of carbon (12 parts) in `CO_(2)` and CO are 32 and 16 respectively. These masses of oxygen bear a sample
ratio of 32:16 or 2:1 to each other.
This is an example of law of multiple proportion .