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Question

Which of the following pairs of molecules will have permanent dipole moments for both members?

A
NO2 and CO2
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B
NO2 and O3
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C
SiF4 and CO2
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D
SiF4 and NO2
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Solution

The correct option is B NO2 and O3
SiF4, CO2 are perfectly symmetrical molecules.

Here, the dipole in all the directions cancel out and the resultant dipole is zero.

Resonance takes place in both NO2 and O3.

The partial charges in both the molecules cause individual dipoles to exist which in turn creates a permanent dipole moment.

Therefore, the option is B.

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