A) in molten state free ions are furnished which are not free to move in solid state
B) in solid state ionic solids are hard and brittle and become soft in molten state
C) all solids conduct electricity in molten state
D) in solid state ions are converted to atoms which are insulators.
Correct Answer: A
Solution :
Ionic solids conduct electricity in molten state since in molten state ionic solids dissociate to give free ions which in solid state are not free to move and are held together by strong electrostatic forces of attraction.
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