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