Which of the following reactions is an e...

Which of the following reactions is an endothermic reaction?

Burning of coal.

Decomposition of vegetable matter into compost.

Process of respiration.

Decomposition of calcium carbonate to form quick lime and carbon dioxide.

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In endothermic reaction

Heat evolved is given positive sign

Change in enthalpy is given negative sign

Heat absorbed is given negative sign

None of these

The enthalpy of reactions is more than that of products

Heat is given to the surroundings

`Delta H` is negative value

`Delta H` has positive value

the enthalpy ofreactants is more than that of products

heat is given to the surroundings

`Delta H` has a positive value

`Delta U` has a negative value