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Two inorganic compounds ‘X’ and ‘Y’ are obtained by treating calcium orthophosphate with magnesium metal. ‘X’ on hydrolysis produce a gas ‘Z’. The gas ‘Z’ reacts with $C u S O_{4} (a q)$ solution to give a black precipitate of compound ‘A’. What is the molar mass of ‘A’?
(Given that: AW: P = 31, Cu = 63.55)

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answer is 252.65.

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Detailed Solution

$C a_{3} {(P O_{4})}_{2} + 8 M g \to \underset{(X)}{C a_{3} P_{2}} + \underset{(Y)}{8 M g O} \underset{(X)}{C a_{3} P_{2}} + 6 H_{2} O \to 3 C a {(O H)}_{2} + \underset{(Z)}{2 P H_{3}} 2 P H_{3} + 3 C u S O_{4} \to \underset{(A, B l a c k)}{C u_{3} P_{2} ↓} + 3 H_{2} S O_{4}$

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