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Question

A white substance melts and decomposes at 730 C. As a solid, it is a non-conductor of electricity but it dissolves in water to form a conducting solution. The white substance is a/an:

A
Covalent network solid
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B
Ionic solid
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C
Molecular solid
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D
Metallic solid
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Solution

The correct option is B Ionic solid
Ionic solids have high melting and boiling points. They do not conduct electricity in solid state because of the strong electrostatic force between the ions, however they can conduct in their molten state and also when dissolved in water.

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