Liquids and Solids | First Year Chemistry Past Paper MCQs | mosaicbro.com

Liquids and Solids | First Year Chemistry Past Paper MCQs

7 of 53 questions (Page 5 of 8)

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29 LiF is a crystalline substance and has:
Correct Answer: A
Explanation: LiF is an ionic crystal (Li⁺ and F⁻ ions).
30 Which of the following liquid has highest boiling point?
Correct Answer: C
Explanation: Water (H₂O) has exceptionally high bp due to H-bonding (100°C vs. -85°C for HCl).
31 The number of Na⁺ ions surrounding each Cl⁻ ion in NaCl crystal is:
Correct Answer: B
Explanation: Each Cl⁻ is octahedrally coordinated by 6 Na⁺ in NaCl lattice.
32 Liquids evaporate at every temperature. When temperature becomes constant:
Correct Answer: C
Explanation: At dynamic equilibrium, evaporation and condensation rates balance.
33 Ionic solids don’t conduct electricity because:
Correct Answer: A
Explanation: Ions are fixed in lattice positions (no mobility) in solid state.
34 Amorphous means:
Correct Answer: D
Explanation: Amorphous materials lack long-range order (e.g., glass).
35 Polarizability is a measure of extent of distortion:
Correct Answer: B
Explanation: Polarizability quantifies electron cloud distortion under electric field.
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