Chemistry

Question Analysis
This question involves the correlation between compound physical properties (melting point and conductivity) and bond type. 

Key Concept Explanation
Ionic compounds consist of positive and negative ions held together by strong electrostatic attractions. These strong forces lead to high melting points. In the solid state, ions are fixed in a rigid lattice and cannot move, so the substance does not conduct electricity. When molten, the ions are free to move and can carry electric charge, allowing conductivity.

Step-by-step Solution
1. Analyze the given properties:
Melting point of 801 °C → very high → suggests strong bonding.
Conducts electricity when molten but not when solid → requires mobile ions.
2. Compare with bonding types:...