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

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Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 .2

Carbon forms two oxides namely CO2 and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2 : 1.

When magnesium burns in oxygen, the amount of magnesium taken for the reaction is equal to the amount of magnesium in magnesium oxide formed

At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour

answer is B.

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Detailed Solution

The element, carbon combines with oxygen to form two compounds, namely carbon dioxide and carbon monoxide. In CO2,12 parts by mass of carbon combine with 32 parts by mass of oxygen while in CO, 12 parts by mass of carbon combine with 1.6 parts by mass of oxygen.Therefore, the masses of oxygen combine with a fixed mass of carbon (12 parts) in CO2, and co are 32 and 16 respectively. These masses of oxygen bear a simple ratio of32 : 16 or 2 : 1, to each other.This is an example of law of multiple proportion.

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