give reasons:
(1) AlCl3 is a poor conductor of electricity in molten state.
(2) AlF3 is a high melting solid whereas SiF4 is a gas.

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Solution

1)Aluminium chloride change their structure from ionic to covalent when the solid turns to a liquid or vapour. So in case of liquid AlCl₃which is covalent in nature does not contain free Al³⁺ or Cl^- ion to conduct electricity.
2) AlF₃ is an ionic solid and they are well packed in crystal lattice so it need high amount of energy to break the lattice hence having high melting point.On the other hand SiF₄ is a covalent compound and there are only weak van der Waal's forces among its molecules that is why it is gas.

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give reasons:(1) AlCl3 is a poor conductor of electricity in molten state.(2) AlF3 is a high melting solid whereas SiF4 is a gas.

give reasons:
(1) AlCl3 is a poor conductor of electricity in molten state.
(2) AlF3 is a high melting solid whereas SiF4 is a gas.