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Question

Which of the following reaction is endothermic?

A
CaCO3CaO+CO2
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B
Fe+SFeS
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C
NaOH+HClNaCl+H2O
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D
CH4+2O2CO2+2H2O
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Solution

The correct option is A CaCO3CaO+CO2
As we know, a dissociation reaction is a chemical reaction where a compound breaks apart into two or more parts and it requires energy for completion.
so, dissociation of CaCO3 requires energy.
All other reactions are exothermic.

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