Question

There are two common oxides of Sulphur, one of which contains $50$% $O_2$ by weight, the other almost exactly $60$%. The weights of sulphur which combine with $1g$ of $O_2$ (Fixed) are in the ratio of:

• A. $1:1$
• B. $2:1$
• C. $2:3$
• D. $3:2$

Answer 1

Answer: (D)

$3:2$

There are two common oxides of sulphur,one of which contains 50% $O_2$ by weight the other almost exactly 60%.

60

% of sulphur % of oxygen

First oxide 50% 50%

Second oxide 40% 60%

In first oxide 1 part of oxygen combines with sulphur = $\frac{50}{50}=1$

Im second oxide 1 part of oxygen will combine with sulphur = $\frac{40}{60}=0.67$

Therefore weight of sulphur which combines with 1 g of $O_2$ are in the ratio : $\frac{1}{0.67}=1:0.67=3:2$

Hence option D is correct answer.