Question

One mole of calcium phosphide on reaction with excess water gives:

• A. $1$ mol of phosphine
• B. $2$ mol of phosphoric acid
• C. $2$ mol of phosphine
• D. $1$ mol of phosphorus pentoxide

Answer 1

Answer: (C)

$2$ mol of phosphine

One mole of calcium phosphide on reaction with excess water gives $2$ mol of phosphine ($P{H}_3$) gas and $3$ mol of calcium hydroxide ($Ca(OH{)}_2$).

The reaction is as follows:
$C{a}_3{P}_2+6H_{2}O\to 3Ca(OH{)}_2+2P{H}_3$
Hence, option C is correct.