Ionic compounds like sodium chloride generally
A{'text': 'Have low melting and boiling points and low densities', 'label': 'A'}
B{'text': 'Do not conduct electricity in solid, molten or aqueous state', 'label': 'B'}
C{'text': 'Exist as covalent gases at ordinary laboratory conditions', 'label': 'C'}
D{'text': 'Have high melting/boiling points and conduct in molten/aqueous state', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Have high melting/boiling points and conduct in molten/aqueous state', 'label': 'D'}
1. Ionic compounds are held together by strong electrostatic forces between oppositely charged ions.
2. Melting/boiling points are high because of these strong forces.
3. In solid state, ions are locked in the lattice and cannot conduct electricity.
4. In molten or aqueous solution, ions are free to move, so they conduct electricity.
_Source: NCERT Class 10 Science, Ch 3 "Metals and Non-metals", §3.2.2_
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