Which of the following ion is colourless?

^{+}

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^{2 +}

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^{2 +}

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^{3 +}

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Solution

The correct option is A Cu $^{+}$
Cu $^{+}$ has no unpair electron so it will be colourless. but Co $^{2 +}$ has 3 unpair electron, Ni $^{2 +}$ has 2 unpair electron and Fe $^{3 +}$ has 5 unpair electron so they will show colour.

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