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The incorrect statement is:
1. The gemstone, ruby, has Cr3+ ions occupying the octahedral sites of beryl.
2. The spin-only magnetic moment of [Ni(NH3)4 (H2 O)2 ]2+ is 2.83 BM.
3. The colour of [CoCl(NH3)5]2+ is violet as it absorbs the yellow light.
4. The spin-only magnetic moments of [Fe(H2O)6 ]2+ and [Cr(H2 O)6 ]2+ are nearly similar

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Correct Answer - Option 1 : The gemstone, ruby, has Cr3+ ions occupying the octahedral sites of beryl.

Concept:

Option (a):

The gemstone, ruby, has Cr3+ ions occupying the octahedral sites of Aluminium oxide (Al2O3) while beryl is beryllium aluminium cyclosilicate (Be3 Al2 Si6 O18) which is a variety of emerald and aquamarine.

Option (b):

[Ni(NH3)4 (H2O)2]2+ = Ni 2+ → 3d8 → 2 unpaired electron

Where, μm = 2.83 BM

Option (c):

The complimentary colour of violet is yellow.

A colour that combined with a given colour makes white or black is called complimentary colour.

Option (d):

[Fe(H2O)6]2+, Fe2+ → 3d6 → 4 unpaired electron

[Cr(H2O)6]2+, Cr2+ → 3d4 → 4 unpaired electron

Thus, the spin-only magnetic moments are nearly similar.

Among the given statements, the statement in option (a) is incorrect.

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