(C) Ruby is a gemstone composed of aluminium oxide $(Al_2O_3)$ in which some $Al^{3+}$ ions are replaced by $Cr^{3+}$ ions in octahedral sites. Statem

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The gemstone,ruby,has $Cr^{3+}$ ions occupying the octahedral sites of beryl.

(C) Ruby is a gemstone composed of aluminium oxide $(Al_2O_3)$ in which some $Al^{3+}$ ions are replaced by $Cr^{3+}$ ions in octahedral sites. Statement $C$ is incorrect because ruby is a variety of corundum $(Al_2O_3)$,not beryl. Beryl is the mineral associated with emeralds. Therefore,the statement claiming $Cr^{3+}$ occupies sites in beryl is false.

Class 12 Chemistry Coordination Compounds Application of Co-ordination compounds

Difficult

The $INCORRECT$ statement is:

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A
The spin-only magnetic moments of $[Fe(H_2O)_6]^{2+}$ and $[Cr(H_2O)_6]^{2+}$ are nearly similar.
B
The spin-only magnetic moment of $[Ni(NH_3)_4(H_2O)_2]^{2+}$ is $2.83 \ BM$.
C
The gemstone,ruby,has $Cr^{3+}$ ions occupying the octahedral sites of beryl.
D
The color of $[CoCl(NH_3)_5]^{2+}$ is violet as it absorbs the yellow light.