How can we say that decomposition reactions are endothermic in nature?

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Solution

In decomposition reactions bonds between atoms of different molecules/ compounds are broken. Now, energy is to be supplied to separate the bonded atoms as work has to be done against the force holding the atoms together. Therefore, breaking of bonds is always endothermic or decomposition reactions are endothermic in nature.

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Are all decomposition reactions endothermic?

All decomposition reactions are not endothermic reactions.

CaO and $C O_{2}$ are produced by heating $C a C O_{3}$ . What are the type of the reaction and the process?

(a) What do you understand by exothermic and endothermic reactions ?

(b) Give one example of an exothermic reaction and one of an endothermic reaction.

(i) Buring of natural gas (ii) Photosynthesis

(iii) Electrolysis of water (iv) Respitation

(v) Decomposition of calcium carbonate

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