question_answer 60)

  Which of the following solids is not an electrical conductor? 1. Mg(s)                               2. TiO (s)       (a) Only 1                            (b) Only 2         3. I2 (s)                                  4.H2O (s) (c) 3 and 4                           (d) 2, 3 and 4

Answer:

                  (c) 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 0 are held together by polar covalent bond and each water molecule held together by hydrogen bonding. Due to non-ionic nature, they are not electrical conductor.