Which among the following solids are electrical insulators in solid state:

Polar molecular solids

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Ionic solids

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Non polar molecular solids

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All of above

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Solution

The correct option is D All of above
Polar and non-polar molecular solids are soft and non-conductors of electricity.
Ionic solids are non-conductors of electricity in solid state, as the constituent ions are not free to move (but in molten state or when dissolved in water the ions are free to move and hence they conduct electricity)

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