A) $ CaCO_3\to CaO+CO_2 $
B) $ Fe+S\to FeS $
C) $ NaOH+HCl\to NaCl+H_2O $
D) $ CH_4+2O_2\to CO_2+2H_2O $
Correct Answer: A
Decomposition is an endothermic process.
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