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Q.

Among the following, buff colour metal sulphide is:

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a

$MnS$

b

CoS

c

${Bi}_{2} S_{3}$

d

$CdS$

answer is D.

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Detailed Solution

MnS is a buff colour metal sulphide. The buff colour of MnS is most likely due to insufficient coupling between the lowest energy unoccupied Mn orbitals, resulting in discrete states rather than a delocalized band. Hence, the option D is correct.

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