In which of the following pairs are both the ions
coloured in aqueous solutions ?
(a) Sc³⁺, Ti³⁺ (b) Sc³⁺, Co²⁺
(c) Ni²⁺, Cu⁺ (d) Ni²⁺, Ti³⁺
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)
Answers
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Answer:
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(d) Ni²⁺, Ti³⁺
Explanation:
The electronic configuration of the given elements are as follows:
Sc - [Ar]
Ti - [Ar] 3d1
Ni - [Ar] 3d8
Cu - [Ar] 3d10
Co - [Ar] 3d7
We find that Ti3+ , Ni2+ and Co2+ have unpaired electrons. So they will be colored in aqueous solutions.
Option D is the answer.
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