A solution of \( \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \) is g...

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A solution of \( \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \) is green but a solution of \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-} \) is colourless. Explain.
\( \mathrm{P} \)
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