1.

As per cooled water freezes spontaneously, its temperature rises to 0^(@)C. DeltaH for the spontaneous process. H_(2)O_((l))(-10^(@)C)toH_(2)O_((s))(0^(@)C) is :

Answer»

zero
`+ve`
`-ve`
EITHER of these

Solution :No energy is TRANSFERRED to or from the system. The energy liberated in the freezing PROCESS warms the system to `0^(@)C`. Thus `DeltaH=0`


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