Question

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)

Answer 1

Answer:

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Answer 2

(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.