Q.

Which one of the following cobalt(III) complex is purple coloured

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a

CoCl3.3NH3

b

CoCl3.4NH3

c

CoCl3.5NH3

d

CoCl3.6NH3

answer is C.

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Detailed Solution

CoCl3.6NH3---yellow ; CoCl3.5NH3---purple; CoCl3.4NH3---green; CoCl3.4NH3---violet; Different colours of CoCl3.4NH3 is due to cis-trans isomerism;
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Which one of the following cobalt(III) complex is purple coloured