Question

When aluminium phosphide is reacted with dil. $H_{2}S{O}_4$
A. $S{O}_2$ is liberated
B. $P{H}_3$ is evolved
C. $H_{2}S$ is evolved
D. $H_2$ is evolved

Answer 1

Hint: Aluminium phosphide(AlP) reacts with water or acids to evolve phosphine gas. It reacts with water to form the same phosphine gas. . It is a crystalline solid which reacts with moisture to form phosphine which is a very flammable and poisonous gas.

Complete step by step answer:
We know that aluminium phosphide reacts with dilute sulfuric acid or water to evolve phosphine gas that is $P{H}_3$. The reaction taking place is given as follows

$AlP+3H_{2}S{O}_4\to A{l}_2(S{O}_4{)}_3+2P{H}_3$

Here we can see that phosphine gas is evolved in this reaction.
Therefore in the given reaction between aluminium phosphide (AlP) and dilute sulfuric acid, phosphine gas that is $P{H}_3$ evolved.

So, the correct answer is Option B .

Additional information:
Aluminium phosphide is a highly effective low-cost insecticide rodenticide. It is also commercially available in the form of pellets. It is used to treat silicon crystals in the semiconductor industry. Phosphine gas is a metabolic poison and a lethal substance. Aluminium phosphide is a highly toxic inorganic compound used as a fumigant. It is a colorless solid which exists as a grey powder.

Note: The toxicity of aluminium phosphide is due to the liberation of phosphine gas. It is a highly toxic gas that causes free radical injury and is highly corrosive to tissues.
Also the similar reaction of aluminium phosphide with water is given down as follows

$AlP+3H_{2}O\to Al(OH{)}_3+P{H}_3$

Accordingly, moisture in the air mixes with phosphide grains and sets off phosphine which is an active component of aluminium phosphide. Phosphine gas spontaneously ignites on coming in contact with air.