Question

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

• A. one mole of phosphine
• B. two moles of phosphoric acid
• C. two moles of phosphine
• D. one mole of phosphorous oxide

Answer 1

Answer: (C)

two moles of phosphine

The reaction is as follows:

$C{a}_3{P}_2+3H_{2}O\to 2P{H}_3+3CaO$
Hence, one mole of calcium phosphide on reaction with an excess of water gives $2$ moles of phosphine.