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In cold countries, water does not freeze at the bottom of a lake in winter, on account of

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anomalous expansion of water between 4°C and 0°C

ice being lighter than water

ice being poor conductor of heat

all the above three factors

answer is D.

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Detailed Solution

On heating from 0°C, volume of water decreases and becomes minimum at 4°C. So at 4°C, density of water at 4°C, goes below the water at 0°C.

Ice is lighter than water and it floats on the surface of lake.

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