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Which of the following reactions is not ...

Which of the following reactions is not exothermic?

A

`CaCO_(3) rarr CaO+CO_(2)`

B

`Fe+S rarr FeS`

C

`NaOH+HCl rarr NaCl+H_(2)O`

D

`CH_(4)+2O_(2) rarr CO_(2)+2H_(2)O`

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The correct Answer is:
A
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