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Q.

In which of the following pairs both the ions are coloured in aqueous solution? (Atomic number, Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

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a

Ni2+ and Cu+

b

Sc3+ and Ti3+

c

Sc3+ and Co2+

d

Ni2+ and Ti3+

answer is D.

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Detailed Solution

Ni2+ and Ti3+ ions are coloured in aqueous solution because they contain unpaired electrons.
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