When water is cooled it contracts until it reaches __________ and then it starts expanding.
37∘C
40∘C
0∘C
4∘C
A
37∘C
B
4∘C
C
40∘C
D
0∘C
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Solution
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Lowering of a temperature of water reduces the translation motion and thus brings the molecules closer. This is apparent in the contraction of water upon cooling. But at 4∘C, the water molecules form extensive hydrogen bonding. As a result, each water molecules is surrounded by four molecules and this increases the vacant space between the molecules. This results in expansion of the system.
option D is correct.
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