Question

The valency of a metallic element is $2$ and its equivalent weight $32$. If the atomic weight of chlorine $35.5$. The molecular weight of the chloride of that metal is :

• A. $135$
• B. $163.5$
• C. $103$
• D. $205$

Answer 1

The correct option is A $135$

Molecular weight of metal=$valency\times equivalentweight=32\times 2=64$

The valency of metal is 2 and that of chloride ion is 1 so the molecular formula is $MC{l}_2$.

Molecular weight of $MC{l}_2=64+35.5\times 2=135$