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Q.

The total number of lone pairs in $PC l_{3}$ molecule

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a

1

b

10

c

6

d

5

answer is B.

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Detailed Solution

In $PC l_{3}$ central atom phosphorous has hybridisation ${sp}^{3}$ . It has three bond pair and one lone pair. Three bond pairs mean $3 \times 2 electrons$ . One lone pair means $1 \times 2 electrons$ .
The total number of lone pairs in ${PCl}_{3}$ molecule is 1.

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