Question

An aqueous solution of sodium hydroxide reacts with white phosphorous to form phosphine $\left(P{H}_3\right)$ and :

• A. $Na{H}_{2}P{O}_2$
• B. $P_2{O}_5$
• C. $Na(P{O}_3{)}_6$
• D. $P_2{O}_3$

Answer 1

The correct option is A $Na{H}_{2}P{O}_2$

Reaction of aqueous sodium hydroxide and white phosphorous is as given below:

$P_4+3NaOH+3H_{2}O\to 3Na{H}_{2}P{O}_2+P{H}_3$

Hence, the main products are $Na{H}_{2}P{O}_2$ and $P{H}_3$ (phosphine gas).

Option A is correct.