Question

The equivalent mass of an element is 4. Its chloride has a vapour density of 59.25. The valency of the element will be:

• A. 4
• B. 3
• C. 2
• D. 1

Answer 1

The correct option is B 3

Eq. wt. of element is $4$

It's chloride has vapour density= $59.25$

To find: valency of element

Molar mass of that chloride = $2\times 59.25$

= $118.25$ gm

Eq. wt. of element is $4$ means $4$ gm element reacts with $35.5$ gm chlorine so eq. wt of metal chloride is $4+35.5=39.5$ gm

$\therefore$ Eq wt. $\times$ valanecy = Molar mass

$\therefore \text{valency}=\frac{118.5}{39.5}=3$
Option B is correct.