Question

If $1.2$ g of metal displace $1.12$ litre hydrogen at normal temperature and pressure, equivalent weight of metal would be:

• A. $24$
• B. $12$
• C. $1.2÷11.2$
• D. $1.2\times 11.2$

Answer 1

The correct option is B $12$

$2.24g$ of metal displaces $1.12l$ of hydrogen

This gives, $2.4g$ displaces $0.05$ mole of hydrogen

hence, $48g$ of the metal displaces $1$ mole of hydrogen

$\therefore$ Valency of the element is $2$ and its atomic weight is $24g$

$\therefore$ equivalent weight is $12g$

$\therefore$ option B is correct