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Question

Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere ?

A
ZnCl2
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B
Cu2Cl2
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C
CuCl2
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D
AgCl
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Solution

The correct option is C CuCl2
CuCl2 in water gives blue solution .

(1) CuCl2+nH2OCu2+ (aq.)
blue colour
Electronic configuration of Cu2+ is 3d9. Thus, it will have unpaired electrons so, it shows colour.

(2) AgCl+nH2OInsoluble

(3) ZnCl2+nH2OZn2+ (aq.)
Colourless
Electronic configuration of Zn2+ is 3d10. Thus, it does mot have unpaired electrons so, it wont shows colour.

Hence, option (d) is correct.
(4) Cu2Cl2+nH2oInsoluble

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