Question

In an experiment, 24 g of iron oxide on reduction with hydrogen gave 1.68 g of iron. In another experiment $2.9$ g of iron oxide gave $2.09$ g of iron on reduction.

Which law is illustrated from the above data?

• A. Law of constant proportions

• B. Law of multiple proportions

• C. Law of reciprocal proportions
• D. Law of conservation of mass

Answer 1

Answer: (A)

Law of constant proportions

Answer 2

(1) : In first experiment,

$2.4$of iron oxide gave $1.68$g of iron.

Mass of iron oxide=$2.4g$

Mass of iron =$1.68g$

Mass of oxygen

= $2.4 - 1.68 = 0.72$

Ratio of masses of iron and oxygen $= \frac{1.68}{0.72} = 7:3$

In second experiment,

Mass of iron oxide

=$2.9g$

Mass of iron =$2.09g$

Mass of oxygen

= $2.9 - 2.09 = 0.81$

Ratio of masses of iron and oxygen$= \frac{2.09}{0.81} = 7:3$