Question

There are two oxides of sulphur. They contain 50 % and 60% of oxygen, respectively, by weights. The ratio of weights of sulphur, which combines with 1 g of oxygen, is:

• A. 1:1
• B. 2:1
• C. 2:3
• D. 3:2

Answer 1

The correct option is D 3:2

In the first oxide, the percentages of O and S are $50$% and $50$%, respectively.
Thus, $1$ g of oxygen will combine with $1$ g of sulphur.
In the second oxide, the percentages of O and S are $60$% and $40$%, respectively.
Thus, $1$ g of oxygen will combine with $\frac{2}{3}$ g of sulphur.
The ratio of weights of sulphur which combine with 1 g of oxygen = $1:\frac{2}{3}$ $=$ $3:2$.