Question

Ionic solids conduct electricity in molten state but not in solid state because:

• A. in molten state free ions are loosely bound which are not free to move in the solid state
• B. in solid state ionic solids are hard, 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.

Answer 1

Answer: (A)

in molten state free ions are loosely bound which are not free to move in the solid state

In solid state, atoms in ionic solids are bonded by strong ionic bonds. They are able to move freely. So, they do not conduct electricity in solid state. While in molten form, the ions and electrons are free to move. So, they conduct electricity in molten state.

So, the correct answer is option "A".