Which of the following is/are NOT true for ionic compounds?
(I) Ionic compounds have high melting and boiling points.
(II) Ionic compounds are brittle and break into pieces when pressure applied.
(III) Ionic compounds are solid and are somewhat hard because of the strong force of attraction between the positive and negative ions.
(IV) Ionic compounds conduct electricity in the molten state.

Correct option is D

The correct answer is (d) Only I.

• Statement I is NOT true because ionic compounds have high, not low, melting and boiling points due to strong electrostatic forces.
• Statements II, III, and IV are true for ionic compounds.

• Ionic compounds form through electron transfer between metals and non-metals.
• They conduct electricity only when molten or dissolved, not in solid state.
• Their crystalline lattice structure makes them brittle.
• They generally dissolve in polar solvents like water.
• Strong ionic bonds create their characteristic hardness.

• Covalent compounds typically have low melting/boiling points (unlike ionic).
• Metals (unlike ionic solids) conduct electricity in the solid state.
• Brittle nature distinguishes ionic solids from metallic solids.
• Ionic compounds like NaCl and KBr show cleavage along definite planes.