When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl t

Monjur Alahi

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous `NH_(3)` dissolves O and gives an intense blue solution.
The metal rod M is
A. Fe
B. Cu
C. Ni
D. CO


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Salim Ahmed Kawsar

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Correct Answer - B
`underset((M))(Cu)+underset((N))(2AgNO_(3))rarrunderset(("Blue"))(Cu(NO_(3))_(2))+2Ag`
`NaCl+underset(("remaining"))(AgNO_(3))rarrunderset((O))(AgCldarr)+NaNO_(3)`
`2AgCl+2NH_(3)(aq)rarrunderset(("Soluble"))([Ag(NH_(3))_(2)]^(+))`
`underset(("remaining"))(Cu(NO_(3))_(2))+4NH_(3)(aq)rarrunderset(("Deep blue colour"))([Cu(NH_(3))_(4)](NO_(3))_(2))`

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