Which of the following ions is colourless?

V³⁺

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Cr³⁺

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Fe²⁺

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Sc³⁺

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Solution

The correct option is D
Sc³⁺

Sc³⁺ does not have unpaired d- electrons. The atomic number of Sc is 21. Its configuration is 1s²2s²2p⁶ 3s² 3p⁶3d⁰ 4s⁰

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