A compound whose liquid has a freezing point of 82 deg C , the compound that is the solid is said to be have the melting point (MP) of 82 deg C.
The answer is 82 deg C because freezing of any liquid is an equilibrium process.
It is equilibrium process because at 0 deg C , the number of H2O molecules becoming ice is equal to the H2O molecules as ice melting from to form a liquid water.
The rate of freezing water is equal to the rate of melting of ice.
Thus, there is an equilibrium between solid and liquid water.
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