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MCQ 1:
Which of the following properties of water is NOT primarily due to hydrogen bonding?
- (A), (C), and (D) are all dependent on the extensive network of hydrogen bonds between water molecules. These bonds allow water to absorb and release a significant amount of thermal energy (high specific heat), resist compression (cohesion), and form dipole-dipole interactions with polar solutes for dissolution.
- (B) is an exception. Ice floats because the hydrogen bonds create a more open, less dense solid structure compared to the close-packed arrangement in most liquids.
Correct Answer: (B) Low density of ice
MCQ 2:
What primary factor contributes to the high surface tension of water?
- (B) is correct. Hydrogen bonding creates strong attractive forces between surface water molecules, resisting external forces and leading to high surface tension.
- (A) and (D) influence other properties but do not directly explain surface tension.
- (C) results from intermolecular interactions, including hydrogen bonding.
Correct Answer: (B) Hydrogen bonding between molecules
MCQ 3:
Which of the following statements is most accurate about the pH of pure water at 25°C?
- (C) is correct. Due to the very small extent of autoionization (H₂O ⇌ H⁺ + OH⁻), pure water has an equal concentration of H⁺ and OH⁻ ions, resulting in a pH of exactly 7.00 at 25°C.
- (A) and (B) are inaccurate.
- (D) may occur in natural water due to dissolved substances, but pure water has a constant pH.
Correct Answer: (C) It is exactly neutral (pH = 7.00).
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