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Extraction of Copper

A metal A on ...

Question

A metal (A) on heating in nitrogen gas gives compound B, B on treatment with $H_{2} O$ gives a colourless gas with when passed through $C u S O_{4}$ solution gives a dark blue-violet coloured solution. A and B respectively are :

N a

and

N a_{3} N

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M g

and

M g_{3} N_{2}

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M g

M g (N O_{3})_{3}

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N a

N a N O_{3}

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Solution

The correct option is B $M g$ and $M g_{3} N_{2}$
The given metal is $M g$ . It gives $M g_{3} N_{2}$ when heated in nitrogen gas:

$3 M g + N_{2} Δ ⟶ M g_{3} N_{2}$

$M g_{3} N_{2}$ on treating with water gives colourless ammonia.

$M g_{3} N_{2} + 6 H_{2} O \to 3 M g (O H)_{2} + 2 N H_{3}$

Ammonia reacts with $C u S O_{4}$ to form blue complex $[C u (N H_{3})_{4}] S O_{4}$

$C u S O_{4} + 4 N H_{3} \to [C u (N H_{3})_{4}] S O_{4}$

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A metal (A) on heating in nitrogen gas gives compound B, B on treatment with H2O gives a colourless gas with when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively are :

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A metal (A) on heating in nitrogen gas gives compound B, B on treatment with $H_{2} O$ gives a colourless gas with when passed through $C u S O_{4}$ solution gives a dark blue-violet coloured solution. A and B respectively are :