Water expands on cooling between $4 ° C$ and $0 ° C$ .

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Solution

Water shows unusual behaviour when it is cooled between $4 ° C$ and $0 ° C$ .This unusual behaviour is called the anomalous expansion of water.
When we freeze the liquids like coconut oil, it changes their state to solid and contracts,i.e., their volume decreases.
But this is happening opposite in the case of water.
When water is cooled between $4 ° C$ and $0 ° C$ , it freezes to form ice and expands. In other words, water expands in volume when it freezes to form ice. This is called the anomalous expansion of water.
Therefore, ice has more volume than the water from which it is formed.
We know that density is inversely proportional to volume,so when we cooled water between $4 ° C$ and $0 ° C$ ,its volume increases but density decreases.
$D e n s i t y = \frac{M a s s}{V o l u m e}$

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	$25 ° C$	$40 ° C$	$60 ° C$
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C	$130 g$	$150 g$	$140 g$

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The amounts of solutes ‘A’, 'B' and ‘C’ in $300$ g of water at $25 ° C$ , $40 ° C$ and $60 ° C$ in their saturated solutions are given below. Identify the true statement among the following:

	$25 ° C$	$40 ° C$	$60 ° C$
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B	$140$ g	$170$ g	$180$ g
C	$130$ g	$150$ g	$140$ g

When water cools, first it expands in volume but below 4°C it starts contracting until it reaches 0°C.

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Water expands on cooling between 4°Cand 0°C.

Water expands on cooling between $4 ° C$ and $0 ° C$ .