Chemistry

Question Analysis
This question involves the distinction between physical properties of ionic compounds and covalent compounds.

Key Concept Explanation
Ionic compounds have strong electrostatic attractions between oppositely charged ions, leading to high melting and boiling points. They often form crystalline solids with a regular, repeating lattice structure.

Option Analysis
Recall the properties of ionic compounds: high melting and boiling points, fixed ions in solid, and no discrete molecules (lattice structure).
Evaluate each option:
Option A (Low melting and boiling points): Incorrect. This is a characteristic of covalent compounds, not ionic compounds. 
Option B (High electrical conductivity in solid form): Incorrect. Solid ionic compounds have fixed ions and cannot conduct electricity....