MCQ
Given below are two statements:

Statement $(I)$: A solution of $\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ is green in colour.

Statement $(II)$: A solution of $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ is colourless.

In the light of the above statements, choose the most appropriate answer from the options given below:

  • A
    Both Statement $I$ and Statement $II$ are incorrect
  • Both Statement $I$ and Statement $II$ are correct
  • C
    Statement $I$ is incorrect but Statement $II$ is correct
  • D
    Statement $I$ is correct but Statement $II$ is incorrect

Answer

Correct option: B.
Both Statement $I$ and Statement $II$ are correct
b
$\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{+2} \rightarrow$ Green colour solution due to d-d transition.

$\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{-2} \rightarrow$ is diamagnetic and it is colourless.

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