Why ionic compounds are good electrolytes?

Why ionic compounds are bad conductors of electricity in crystalline state but good conductors of electricity in aqueous solutions ?

Why do ionic compounds have high melting points?

Most of the ionic substances are A. Electrolytes in molten state B. With directional character C. Soluble in solvents like ether

Why ionic compounds dissolve in polar solution and covalent compounds dissolve in non-polar solution?

Ionic compounds in general posses.

The ionic compounds which are produced by neutralization of acid with bass are-

Why do we add impurities to electrolyte during electrolytic extraction of metals?

How do cations and anions of an ionic compound exist in its solid state?