Question

Given below are two statements:
Statement (I): A solution of $[Ni(H_2O)_6]^{2+}$ is green in color.
Statement (II): A solution of $[Ni(CN)_4]^{2-}$ is colorless.
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
• B. 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 1

Answer: (B)

Both Statement I and Statement II are correct

Answer 2

The compound $[ \text{Ni}(\text{H}_2\text{O})_6 ]^{2+}$ appears green due to d-d transitions in the visible spectrum.

$[ \text{Ni}(\text{CN})_4 ]^{2-}$ is diamagnetic and does not exhibit any d-d transitions, rendering it colourless.
Thus, the correct answer is option 2.