The density of water is maximum at:
a) 0?c b) 100?c c) 4?c d) 25? c

Please state the reason also.

Dear student,
Water attains its maximum density at about 4°C because it is at that temperature that hydrogen bonds form. The effect of the formation of these bonds is that molecules of water are actually pushed apart and into an alignment scheme (crystals) that prevents them from more closely packing together as in the liquid state.
Regards

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A) 0

As water is ice at that stage and in other cases the matter would be either gas or liquids.

We know that solids are more denser, so A is the correct answer.
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