A) \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\]
B) \[Fe+S\to FeS\]
C) \[NaOH+HCl\to NaCl+{{H}_{2}}O\]
D) \[C{{H}_{4}}+2{{O}_{2}}\to C{{O}_{2}}+2{{H}_{2}}O\]
Correct Answer: A
Solution :
Decomposition is an endothermic process.
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