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What is Z in following reaction CuSO4 + Z → Cu3P2 +H2SO4

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What is Z in following reaction
CuSO4 + Z →  Cu3P2 +H2SO4
HgCl2 + Z →  Hg3P2 +HCl
(a) White phosphorus 

(b) Red phosphorus 

(c) Phosphine 

(d) Orthophosphoric acid

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(c) 3CuSO4 + 2PH3 → Cu3 P2 + 3H2 SO4

    3HgCl2 + 2PH3 → Hg3 P2 + 6HCl

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