Most ionic compounds have :

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high melting points and low boiling points

three-dimensional network structures, and are good conductors of electricity in the molten state

high melting points and nondirectional bonds

high solubilities in polar solvents and low solubilities in nonpolar solvents

answer is B, C, D.

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Detailed Solution

The chemical bond formed between two or more atoms as a result of the complete transfer of one or more electrons from one atom to another is called Ionic or electrovalent bond. Ionic compounds have high boiling point and melting point due to strong electrostatic force of attraction among oppositely
charged ions. In solid state, it does not have free ions and are thus bad conductor of electricity. In fused state or aqueous solution, due to free ions, they are good conductor of electricity. Highly soluble in water(Polar solvents) as like dissolves like.

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