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Iron II Oxide

When a metal ...

Question

When a metal rod $M$ is dipped into an aqueous colourless concentrated solution of $A g N O_{3}$ , the solution turns light blue. Addition of aqueous $N a C l$ to the blue solution gives a white precipitate O. Addition of aqueous $N H_{3}$ dissolves $O$ and gives an intense blue solution.
The metal rod $M$ is

A

F e

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B

C u

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C

N i

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D

C o

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Solution

The correct option is B $C u$
The metal rod $M$ is $C u$ .
$C u (M) + 2 A g N O_{3} \to C u (N O_{3})_{2} blue + 2 A g$

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