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 7 of 8)

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43 Crystal system shown by diamond is:
Correct Answer: A
Explanation: Diamond has a face-centered cubic (FCC) structure.
44 The strongest acid among halogen acids is:
Correct Answer: D
Explanation: Acid strength increases down Group 17: HI > HBr > HCl > HF (weaker H-bonding in HI).
45 The number of Cl⁻ ions per unit cell of NaCl is:
Correct Answer: C
Explanation: NaCl unit cell contains 4 Na⁺ and 4 Cl⁻ ions.
46 How much more space is occupied by water on freezing?
Correct Answer: A
Explanation: Ice expands ~9% due to hexagonal H-bonded lattice.
47 Boiling point of H₂O at Mount Everest would be:
Correct Answer: D
Explanation: Lower pressure at high altitude reduces boiling point (~69°C at Everest summit).
48 Allotropy is the property of:
Correct Answer: B
Explanation: Allotropy refers to different structural forms of an element (e.g., O₂ vs. O₃).
49 Hydrogen bonding is maximum for:
Correct Answer: B
Explanation: Water forms extensive H-bonds (2 per molecule) due to high electronegativity of O.
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