The INCORRECT statement is :
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- the color of \(\mathrm{[CoCl(NH_3)_5]^{2+}}\) is violet as it absorbs the yellow light.
- the gemstone, ruby, has \(\mathrm{Cr^{3+}}\) ions occupying the octahedral sites of beryl.
- the spin-only magnetic moment of \(\mathrm{[Ni(NH_3)_4(H_2O)_2]^{2+}}\) is 2.83 BM.
- the spin-only magnetic moments of \(\mathrm{[Fe(H_2O)_6]^{2+}}\) and \(\mathrm{[Cr(H_2O)_6]^{2+}}\) are nearly similar.
The Correct Option is B
Solution and Explanation
(2) Ruby is Al2O3 in which some Al3+ ions at octahedral sites are replaced by Cr3+. It is emerald (not ruby) that has Cr3+ in beryl (Be3Al2Si6O18). So (2) is wrong.
(3) Ni2+ is d8 with n = 2 unpaired electrons: μ = √(2 x 4) = √8 = 2.83 BM: true.
(4) Fe2+ (d6) and Cr2+ (d4) in weak-field aqua complexes both have 4 unpaired electrons: μ = √24 = 4.90 BM for both: true.
Answer: (2) the gemstone, ruby, has Cr3+ ions occupying the octahedral sites of beryl.
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