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Q.

Anhydrous cobalt (II) chloride is blue in colour but on dissolving in water it changes to pink in colour because :

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a

Its oxidation state changes.

b

Its coordination number changes.

c

It magnetic character changes.

d

In water it shows fluorescence.

answer is C.

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Detailed Solution

CoCl2 has a blue colour in tetrahedral geometry but when it dissolves in water, it changes its color to pink because as it dissolves in water, its coordination number becomes six.

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