Question
One mole of calcium phosphide on reaction with excess of water gives
A.
one mole of phosphine.
B.
two moles of phosphoric acid.
C.
two moles of phosphine.
D.
one mole of phosphorus oxide.
Answer :
two moles of phosphine.
Solution :
$$\mathop {C{a_3}{P_2}}\limits_{1\,\,mole} + 6{H_2}O \to 3Ca{\left( {OH} \right)_2} + \mathop {2P{H_3}}\limits_{2\,\,mole} $$