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

Liquids and Solids | First Year Chemistry Past Paper MCQs

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1 Which one is the example of cubic crystals?
Correct Answer: D
Explanation: Diamond has a cubic crystal structure (face-centered cubic).
2 The boiling point of the halogens:
Correct Answer: A
Explanation: Boiling points increase down Group 17 due to stronger London dispersion forces.
3 Vapor pressure of a liquid in a closed container depends upon:
Correct Answer: B
Explanation: Vapor pressure depends only on temperature (for a given substance).
4 A crystal system in which all the axes and angles are unequal is called:
Correct Answer: C
Explanation: Triclinic crystals have all axes (a ≠ b ≠ c) and angles (α ≠ β ≠ γ) unequal.
5 At Murree hills, water boils at:
Correct Answer: A
Explanation: High altitude (lower atmospheric pressure) reduces boiling point (e.g., ~98°C at Murree).
6 Coordination number of Na⁺ ion in NaCl is:
Correct Answer: D
Explanation: In NaCl lattice, each Na⁺ is surrounded by 6 Cl⁻ ions (octahedral coordination).
7 Water may boil at 120°C when external pressure is:
Correct Answer: D
Explanation: Higher pressure (1489 torr ≈ 2 atm) raises boiling point to 120°C.
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