A) the spin-only magnetic moments of \[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{2+}}\] and \[{{[Cr{{({{H}_{2}}O)}_{6}}]}^{2+}}\]are nearly similar.
B) the spin-only magnetic moment of \[{{[Ni{{(N{{H}_{3}})}_{4}}{{({{H}_{2}}O)}_{2}}]}^{2+}}\]is \[2.83BM.\]
C) the gemstone, ruby, has \[C{{r}^{3+}}\]ions occupying the octahedral sites of beryl.
D) the color of \[{{[CoCl{{(N{{H}_{3}})}_{5}}]}^{2+}}\]is violet as it absorbs the yellow light.
Correct Answer: C
Solution :
[a] \[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{2+}},F{{e}^{2+}}\to 3{{d}^{6}}\to 4\]unpaired electron \[{{[Cr{{({{H}_{2}}O)}_{6}}]}^{2+}},C{{r}^{2+}}\to 3{{d}^{4}}\to 4\]unpaired electron [b]\[[Ni{{(N{{H}_{3}})}_{4}}]{{({{H}_{2}}O)}_{2}}{{]}^{2+}}=N{{i}^{2+}}\to 3{{d}^{8}}\to 2\] unpaired electron \[{{\mu }_{m}}=2.83B.M\] [c] In gemstone, ruby has \[C{{r}^{3+}}\]ion occupying the octahedral sites of aluminium oxide \[(A{{l}_{2}}{{O}_{3}})\]normally occupied by \[A{{l}^{3+}}\]ion. [d] Complimenry color of violet is yellow
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