Water has maximum density at __________________?
Correct answer: C. 4°C
- A. 0°C
- B. 2°C
- C. 4°C
- D. 100°C
Explanation
Water has its maximum density at 4°C because hydrogen bonding produces an open structure near freezing, while warming from 0°C to 4°C allows that structure to contract. Students may choose 0°C, option a, by assuming cooling always makes water densest, but water expands as it approaches freezing.
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About Anomalous Behaviour of Water
Water expands when cooled below 4°C and when it freezes, giving liquid water its maximum density at 4°C. The explanation depends on hydrogen bonding and the open structure of ice, which makes ice less dense than water and allows it to float.
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