Question

Lead form 2 oxides. the two oxides were subjected to reduction with carbon separately:

Oxide 1: Original mass: 8.92 gm
Loss in mass: 0.64 gm

Oxide 1: Original mass: 119.5 gm
Loss in mass: 16 gm

The data illustrates:

• A. Law of multiple proportion
• B. Law of constant composition
• C. Law of variable proportion
• D. Law of reciprocal proportion

Answer 1

The correct option is B Law of constant composition

In experiment $A-$ Oxide of $Pb=8.92g$

Mass of $Pb$ after reduction $=8.92g-0.64g=8.28g$

Ratio of oxide of $Pb$ to $Pb=\frac{8.92}{8.28}=\frac{1.077}{1}$

In experiment $B-$ Oxide of $Pb=119.5g$

After reduction, $Pb=119.5-16=103.5g$

Ratio of oxide of $Pb$ to $Pb=\frac{119.5}{103.5}=\frac{1.15}{1}$

The data illustrates the law of constant proportion.

Hence, the correct option is $\text{B}$