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Give reasons for the following: Zn^(2+...

Give reasons for the following:
`Zn^(2+)` salts are white but `Cu^(2+)` salts are blue.

Text Solution

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Zinc and copper are transition metals and their ions are generally coloured due to d-d transition of unpaired electron. But in case of `Zn^(2+) 3d` is completely filled and no unpaired electrons are available for transition. So light falling on these ions gets completely transmitted and their salts appear white. However ion `Cu^(2+) 3d` has 9 electrons. The unpaired electron absorbs particular wavelengths in visible region of light and the transmitted light shows the complementary colour .blue..
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