Chemistry-
General
Easy

Question

Which one othe reaction is an exothermicreaction-

  1. CaCO3(s)→CaO(s)+CO2(g)    
  2. N2(g)+O2(g)→2NO(g)    
  3. 2HgO(s)→2Hg(s)+O2(g)    
  4. Nonof these    

The correct answer is: Nonof these

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