Phosphine is prepared from which of the following methods?
Answer & explanation
Correct answer: option 1
Phosphine (PH3) is typically prepared from the reaction of metal phosphides with water or dilute hydrochloric acid. Therefore, the correct method is:
1. By reacting calcium phosphide with water or dilute HCl
The chemical equation for this reaction is:
\[ \text{Ca}_3\text{P}_2 + 6\text{H}_2\text{O} \rightarrow 2\text{PH}_3 + 3\text{Ca}(\text{OH})_2 \]
This method involves the reaction of calcium phosphide (Ca3P2) with water to produce phosphine gas and calcium hydroxide.