Lead bromide conducts electricity when molten but not when solid.

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Multiple Choice

Lead bromide conducts electricity when molten but not when solid.

Explanation:
Electrical conductivity in ionic compounds comes from the movement of ions. In the solid form, lead bromide has ions locked in a rigid crystal lattice, so they can’t move and there are no charge carriers to carry current. When it is melted, the lattice breaks apart and the ions become free to move; the mobile Pb2+ and Br− ions can drift under an electric field, allowing an electric current to flow. That’s why it conducts electricity when molten but not when solid.

Electrical conductivity in ionic compounds comes from the movement of ions. In the solid form, lead bromide has ions locked in a rigid crystal lattice, so they can’t move and there are no charge carriers to carry current. When it is melted, the lattice breaks apart and the ions become free to move; the mobile Pb2+ and Br− ions can drift under an electric field, allowing an electric current to flow. That’s why it conducts electricity when molten but not when solid.

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