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Q.

If colour of NiH2O2(en)22+ is blue-purple then what would be the colour of Ni(en)32+?

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a

Green

b

Pale blue

c

Deep blue

d

Violet

answer is D.

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Detailed Solution

Δo of Ni(en)32+ is more w.r.t. NiH2O2(en)22+. So Ni(en)32+ absorb more frequency colour for d−d transition. So possibly its colour is violet.
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