Question

Aqueous NaOH + ${P_4}$ (white)⟶ $P{H_3}$ + X. Compound X is:
(A) $Na{H_2}P{O_2}$
(B) $Na{H_2}P{O_4}$
(C) $N{a_2}C{O_3}$
(D) $NaHC{O_3}$

Answer 1

Hint : In the given question firstly we have to define what exactly is the Sodium hypophosphite and then we can give the proper definition and the characteristics of it. Although we can say that we know that the main points among the following is the chemical reaction i.e. ${P_4} + 3NaOH + 3{H_2}O \to P{H_3} + 3Na{H_2}P{O_2}$ .

Complete Step By Step Answer:
The given question statement asks about the entire process through which we would be able to get the proper and correct explanation of the white phosphorus and the different characteristics of the compound both physical and chemical.
The compound formed would be of the Sodium hypophosphite with the chemical formula of NaPO2H2, also known as sodium phosphinate) is the sodium salt of hypophosphorous acid and is often encountered as the monohydrate. It has a physicality of a solid at room temperature, and also appears as odorless white crystals. It is also soluble in water, and even it easily absorbs moisture from the air.
The chemical reaction for the given statement is :
${P_4} + 3NaOH + 3{H_2}O \to P{H_3} + 3Na{H_2}P{O_2}$
In the given problem the white phosphorus reacts with the sodium hydroxide and water to produce phosphine and sodium hypophosphite . Sodium hydroxide - cold, concentrated solution. This reaction will also take place at a slow pace.
Hence we can say that the right answer of the given question is option B.

Note :
Sodium hypophosphite should be kept in a cool, dry place, isolated from oxidizing materials. It decomposes into phosphine which is irritating to the respiratory tract and disodium phosphate. Sodium hypophosphite is mainly used for electroless nickel plating (Ni-P).