A glass of water is at its freezing poin...

A glass of water is at its freezing point of 0 `""^(@)C`. When salt is added, its temperature drops to 5 `""^(@)C` below zero. What is the temperature of the water?

5 `""^(@)C`

`+5" "^(@)C`

`-5" "^(@)C`

5 `""^(@)C` below zero

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Most substances contract on freezing . However, water does not belong to this category. We know that water expands on freezing. Further , coefficient of volume expansion of water in the temperature range from 0^(@)C to 4^(@)C is negative and above 4^(@)C it is positive . This behaviour of water shapes the freezing of lakes as the atmospheric temperature goes down and it is still above 4^(@)C . As the atmospheric temperature goes below 4^(@)C

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