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which of the following solids is not...

which of the following solids is not an electrical conductor ?
(a) Mg(s) (b) TiO(s) ( c) `I_(2)(s)` (d) `H_(2)O(s)`

A

(I) only

B

(II) only

C

(III) and (IV)

D

(II),(III) and (IV)

Text Solution

Verified by Experts

The correct Answer is:
C
`I_(2(s))` is a non-polar molecular solid and is an insulator. `H_2O_((s))` 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 solution .
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