Question

The vapour density of a chloride of a metal is $ 81.5\,(H=1) $ and the chloride contains $34.46\%$ metal. The specific heat of the metal is $0.115$ . The molecular formula of chloride is

• A. $MCl_{2}$
• B. $M_{2}Cl_{3}$
• C. $MCl_{3}$
• D. $MCl_{4}$

Answer 1

Answer: (C)

Vapour density of chloride $ =81.5$
Molecular mass $ =2 \times 81.5=163$
Metal weight $34.46\%$ of Chlorine weight $ =65.54\%$ of $163=106.8$
Number of chlorine atom $=\frac{106.8}{3.5}=3$
Thus, molecular formula of chloride $MCl_{3}.$