A waxy crystalline solid (X) with a garl...

A waxy crystalline solid (X) with a garlic odour is obtained by burning white phosphorus in air. X reacts vigorously with hot water forming an acid and gas Y. Y is neutral towards litmus and produces a black residue Z when passed through cupric sulphate, What are Y and Z?

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The correct Answer is:

`PH_(3),Cu_(3)P_(2)`

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