Give reasons for the following :
(i) Ionic compounds have high melting point and boiling point.
(ii) Ionic compounds conduct electricity in molten state.
(iii) Ionic compounds are solids at room temperature and are somewhat hard.
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(i) A large amount of energy is required to break the strong inter-ionic attraction.
(ii) When ionic compounds is present in molten state, crystal structure deforms and they can easily conduct electricity with the mobile ions.
(iii) Due to the strong force of attraction between the positive and negative ions.
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