When a metal rod $\mathbf{M}$ is dipped into an aqueous colourless concentrated solution of compound $\mathbf{N}$, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate $\mathbf{O}$. Addition of aqueous $\mathrm{NH}_3$ dissolves $\mathbf{O}$ and gives an intense blue solution.
The metal rod M is
Select the correct option:
A
Fe
B
Cu
C
Ni
D
Co
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
$$
\underset{\mathrm{M}}{\mathrm{Cu}}+\underset{\mathrm{N}}{2 \mathrm{AgNO}_3} \rightarrow \underset{\text { Blue }}{\mathrm{Cu}\left(\mathrm{NO}_3\right)_2}+2 \mathrm{Ag}
$$
While Cu partially oxidizes to $\mathrm{Cu}\left(\mathrm{NO}_3\right)_2$ and remaining $\mathrm{AgNO}_3$ reacts with NaCl .
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