Question

Normality of $0.3M$ phosphorus acid $\left(H_{3}P{O}_3\right)$ is:

• A. $0.5$
• B. $0.6$
• C. $0.9$
• D. $0.1$

Answer 1

The correct option is B $0.6$

For acids, Normality $=$ molarity$\times$basicity

So, Normality = $0.3\times 2=0.6$

$\because$ Basicity of $H_{3}P{O}_3$ is 2 because one of the H is not replaceable in H3PO3. The H atoms which are linked to oxygen are replaceable, but H atom linked directly to central atom P is nonreplaceable.

Hence, the correct option is $B$