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Question

Which of the following solids is not an electrical conductor?
(I) Mg(s)
(II) TiO(s)
(III) I2(s)
(IV) H2O(s)

A
(I) only
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B
(II) only
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C
(III) and (IV)
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D
(II), (III) and (IV)
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Solution

The correct option is C (III) and (IV)
I2(s) is a non-polar molecular solid and is an insulator. H2O(g) is a hydrogen bonded molecular solid and is an insulator. Mg is metallic solid and is a conductor in solid as well as in molten state. TiO is an ionic solid and is an insulator in solid state but is a conductor in molten state and in aqueous solutions.

Hence, Option "C" is the correct answer.

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