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Question

Which of the following solids is not an electrical conductor ?

1. Mg(s)       2.Tio(s)   3.I2  (s)    4.    H2O   (s)

(a)  Only 1    (b) Only 2   (c)  3 and 4   (d)  2,3 and 4


Solution

Answer:  (c)  3 and 4   

The iodine is a non-polar molecular solid in which iodine molecules are held together by London force or dispersion force. This is soft and non-conductor of electricity.

Water is a hydrogen-bonded molecular solid in which H and O are held together by a polar covalent bond and each water molecule held together by hydrogen bonding. Due to non-ionic nature, they are not an electrical conductor.


Chemistry
NCERT Exemplar
Standard XII

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