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Q.

Of the following molecules, the one, which has permanent dipole moment, is :

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a

${BF}_{3}$

b

${PF}_{3}$

c

${PF}_{5}$

d

${SiF}_{4}$

answer is C.

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Detailed Solution

${PF}_{3}$ is a trigonal pyramidal molecule with a permanent dipole moment (like ammonia, the P has a single lone pair of electrons).

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