Question

Carbon and oxygen forms two compounds. Carbon content in one of them is $42.9\%$ while in the other is $27.3\%$. The give data is in support with

• A. law of definite proportions
• B. law of reciprocal proportions
• C. law of multiple proportions
• D. law of conservation of mass

Answer 1

Answer: (C)

If $C=42.9\%$ then $O=100-42.9=57.1\%$
Let $100g$ of the compound is taken,
then $1g$ oxygen combines with $=\frac{42.9}{57.1}$
$=0.75g$ carbon.
In the second compound, $o=100-27.3n=72.7\%$
$1g$ oxygen combines with $=\frac{27.3}{72.7}$
$=0.375g$ of carbon
Ratio of carbon in two compounds combining with fixed weight of oxygen
$=0.75:0.375=2:1$
Hence, it supports law of multiple proportion.