Question

Th normality of 0.3 M phosphorus acid $\left(H_{3}P{O}_3\right)$, phosphoric acid $\left(H_{3}P{O}_4\right)$ and boric acid $\left(H_{3}B{O}_3\right)$ are respectively :

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

Answer 1

Answer: (C)

$0.6,0.9,0.3$

$\left(H_{3}P{O}_3\right)$ diabasic 0.6N
$\left(H_{3}P{O}_4\right)$ tribasic 0.9N
$\left(H_{3}B{O}_3\right)$ monobasic 0.3N