Solids are generally divided into types: ionic, metallic, amorphous, molecular, and covalent network. Categorization is based largely on the physical properties of the substances involved.
Examine the properties of the four solids, $A, B, C$ , and $D$ as described in the table below.
Substance Melting Point Water Soluble? Electrical Conductor?
A $> 3800^{\circ} C$ No No
B $> 3500^{\circ} C$ No Yes
C $2230^{\circ} C$ No No
D $2700^{\circ} C$ No No
Which of the following is the most likely category for these four solids?

Ionic crystalline

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Covalent network

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Metallic

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Molecular

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Solution

The correct option is A Ionic crystalline
Ionic crystalline solids are solids in which the units occupying lattice points are positively and negatively charged ions. In such solids the repeating units are the positively and negatively charged ions.
For example: Salts like $N a C l, B a S O_{4}, K B r$ , etc.
They are hard and brittle in nature, have high melting and boiling point, have high density due to close packing.
Since, in solid state the ions are not free to move about due to strong electrostatic force they are electrical insulators. However in molten state they conduct electricity due to the presence of free ions.

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Substance	Melting Point	Water Soluble?	Electrical Conductor?
A	$> 3800^{\circ} C$	No	No
B	$> 3500^{\circ} C$	No	Yes
C	$2230^{\circ} C$	No	No
D	$2700^{\circ} C$	No	No