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A waxy crystalline solid (A) with a garlic odour is obtained by buring white P in a stream of air. (A) reacts vigorously with hot water forming a gas (B) and an acid (C). Gas (B) has unplesant odour of rotten fish and is neutral towards litmus. When passed through CuSO4 solution gas (B) produced a black ppt. (D) What are (A) to (D) ? Give chemical equations of the reactions.

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(A) P4O6; (B) PH3; (C) H3PO4; (D) Cu3P2

The given changes are : 

P + 3O2(s) (air)  P4O6 (Garlic odour); P4O6 + 6H2O (hot)  3H3PO4 + PH3  

(B) is PH3 having rotten fish smell and neutral towards litmus 

3CuSO4 + 2PH3 → Cu3P2 + 3H2SO4 (Cu3P2 is black substance insoluble in water)

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