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Q.

When a solid melts, there is 

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a

An increase in enthalpy 

b

A decrease in enthalpy 

c

No change in enthalpy 

d

A decrease in internal energy

answer is A.

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Detailed Solution

Melting of solid requires energy/heat. When a solid absorbs heat it melts into its liquid form. And as we know, in an endothermic reaction, the heat is absorbed in the chemical reaction. Hence, the enthalpy is increased here. So, when a solid melt there is an increase in the enthalpy.

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