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Question

Chloride of which of the following element is coloured? 


A
Ag
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B
Hg
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C
Zn
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D
Co
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Solution

The correct option is D Co
Chloride of Co element is coloured.

$$ CoCl_3 - Co^{3+} - [Ar]3d^6 4s^0 \to$$ 4 unpaired electrons. So, it will be coloured.

Chemistry
NCERT
Standard XII

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