Question

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

• A. $0.1$
• B. $0.9$
• C. $0.3$
• D. $0.6$

Answer 1

The correct option is D $0.6$

Phosphorus acid contains only two replaceable hydrogen atoms. Hence, it is a dibasic acid.
The relationship between the normality and molarity is given as $N=M\times basicity$, where, $N$ is normality and $M$ is molarity.
On substituting values in the above expression, $normality=0.3\times 2=0.60$.