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Properties of Water

Magnesium on ...

Question

Magnesium on heating in air gives $(A)$ and $(B)$ . On reaction with water $(B)$ gives colourless gas $(C)$ . $(C)$ when passed through $C u S O_{4}$ solution gives a blue coloured solution $(D)$ . The blue solution is:

M g O

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M g_{3} N_{2} S O_{3} . H_{2} O

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N H_{3}

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[C u (N H_{3})_{4}] S O_{4} . H_{2} O

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Solution

The correct option is D $[C u (N H_{3})_{4}] S O_{4} . H_{2} O$
Option $(D)$ is correct.
Magnesium on strong heating reacts with nitrogen of air.
$M g + O_{2} \to M g O [A] + M g_{3} N_{2} [B]$
$M g_{3} N_{2} [B] + H_{2} O \to M g (O H)_{2} + N H_{3} [C]$
$N H_{3} + C u S O_{4} (a q) \to [C u (N H_{3})_{4}] S O_{4} . H_{2} O [D]$

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