p-Block elementsMediumBloom L3

Question

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

Options

A.one mole of phosphine
B.two moles of phosphoric acid
C.two moles of phosphine
D.one mole of phosphorus penta-oxide

Solution

Sol. One mole of calcium phosphide on reaction with excess water gives 2 mol of phosphine (PH3​) gas and 3 mol of calcium hydroxide (Ca(OH)2​).

The reaction is as follows:

Ca3​P2 ​+ 6H2​O → 3Ca(OH)2 ​+ 2PH3​

Hence, option C is correct.

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