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Q.

Which of the following molecules contains one lone pair of electrons on the central atom?

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a

CCl4

b

H2 S

c

CH4

d

PH3

answer is B.

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Detailed Solution

In PH3 molecule, the central atom 'P' contains one lone pair. In CH4 and CHCl3 the central atom C does not have any extra electrons as the covalency of carbon is satisfied. 

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