When water is cooled it contracts until it reaches ......... and … - Vidyadip

MCQ

When water is cooled it contracts until it reaches $.........$ and then it starts expanding :

A
$37^{\circ}C$
B
$40^{\circ}C$
C
$0^{\circ}C$
✓
$4^{\circ}C$

✓

Answer

Correct option: D.

$4^{\circ}C$

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 $4^{\circ}C$, 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.

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