If we take some water at 0oC and start heating it, we find that in the temperature range of 0oC to 4oC:
Correct answer: B. It contracts on heating
- A. It expands on heating
- B. It contracts on heating
- C. Both
- D. None
Explanation
If we take some water at 0 C and start heating it, we find that in the temperature range 0oC to 4oC, it contracts instead of expanding.on heating it further above 4 C, it expands.
This question appeared on the NUMS 2020 paper, which you can sit online with every answer explained.
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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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