Question

There are two common oxides of Sulphur, one of which contains 50% O₂ by weight, the other almost 60% by weight. The weights of sulphur which combine with 1 g of O₂ (fixed) are in the ratio of ______.

Options

• 1 : 1

• 2 : 1

• 2 : 3

• 3 : 2

Answer 1

There are two common oxides of Sulphur, one of which contains 50% O₂ by weight, the other almost 60% by weight. The weights of sulphur which combine with 1 g of O₂ (fixed) are in the ratio of 3 : 2.

Explanation:

	First oxide	Second oxide
Sulphur	50%	40%
Oxygen	50%	60%

In the first oxide, 1 part oxygen combines with sulphur = `50/50` = 1

Similarly for second oxide = `40/60` = 0.67

So the ratio is 1 : 0.67 or 3 : 2.