Question

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

Options

• one mole of phosphine

• two moles of phosphoric acid

• two moles of phosphine

• one mole of phosphorus pentoxide

Answer 1

One mole of calcium phosphide on reaction with excess water gives two moles of phosphine.

Explanation:

\[\ce{\underset{(1 mol)}{Ca3P2} + 6H2O -> 3Ca(OH)2 + \underset{(2 mol)}{2PH3↑}}\]