Which of the following reaction is exoth...

Which of the following reaction is exothermic ?

A

`CaCO_3rarrCaO+CO_2`

B

`Fe+SrarrFeS`

C

`NaOH+HCIrarrNaCI+H_2O`

D

`CH_4+2O_2rarrCO_2+2H_2O`

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The correct Answer is:

B

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