Which property best indicates that a compound contains an ionic bond? it is insoluble in water. it can be easily flattened. it has a low boiling point. it conducts electricity when molten.

Option (d) is the correct answer.

Explanation:

Ionic bond is formed by the transfer of electrons. The ionic compound has high difference of electronegativities between its atoms.

Only ionic compounds conduct electricity in molten state as ionic compounds contain charges species like cation and anion. These ions are free to move.

Whereas covalent bond is formed by the sharing of electrons. They do not contain any charge. Hence, they are not able to conduct electricity.

Thus, we can conclude that the property which best indicates that a compound contains an ionic bond is that it conducts electricity when molten.

The answer is (D) It conducts electricity when molten.

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