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

The Correct Option is B

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.