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 3 of 8)

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15 Hydrogen bonding is strongest in:
Correct Answer: D
Explanation: HF has the strongest H-bonding due to high electronegativity of F and small atomic size.
16 Allotropy is the property of:
Correct Answer: A
Explanation: Allotropy refers to different forms of the same element (e.g., O₂ vs. O₃).
17 Ice occupies more space than liquid water by:
Correct Answer: A
Explanation: Ice expands ~9% due to hexagonal open structure (hydrogen bonding).
18 Structure of ice is:
Correct Answer: A
Explanation: Each water molecule in ice is tetrahedrally bonded to four others.
19 In orthorhombic crystal, the unit cell dimensions are:
Correct Answer: B
Explanation: Orthorhombic: all axes unequal (a ≠ b ≠ c), all angles 90°.
20 London dispersion forces are significant for:
Correct Answer: D
Explanation: Non-polar molecules rely entirely on London forces (temporary dipoles).
21 Which substance shows anisotropic behavior in electrical conductivity?
Correct Answer: B
Explanation: Graphite conducts electricity along layers (anisotropic) but not perpendicular to them.
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