A) one mole of phosphine
B) two moles of phosphoric acid
C) two moles of phosphine
D) one mole of phosphorus pentoxide
Correct Answer: C
Solution :
One mole of calcium phosphide with excess water gives two moles of phosphine. \[C{{a}_{3}}{{P}_{2}}+6{{H}_{2}}O\xrightarrow{{}}2P{{H}_{3}}+3Ca{{(OH)}_{2}}\]
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