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Question

Which of the following molecules does not possess a permanent dipole moment?


A
CS2
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B
SO23
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C
H2S
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D
SO2
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Solution

The correct option is A CS2
Dipole moment is a vector quantity.

SO3

SO3 has a trigonal planar structure.

In it, the individual S-O bond moments cancel out each other so that the net dipole moment is zero.

i.e., µ = 0 for SO3

SO2 It has a bent structure due to the presence of one lone pair.

Is a polar molecule.

In it, the individual S-O bond moments do not cancel out each other so that the net dipole

moment is not zero.

It has a permanent dipole moment.

H2S

It has a bent structure due to the presence of one lone pair.

Is a polar molecule.

In it, the individual H-S bond moments do not cancel out each other so that the net dipole

moment is not zero.

It has a permanent dipole moment

CS2

CS2 is one of the molecules which does not possess a dipole moment.

It is a linear molecule and therefore it does not have a permanent dipole moment.



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