Chemistry-
General
Easy

Question

Which respresent an exothermicre action-

  1. 2HgO(s)+180KJ→2Hg(ell)+O2(s)    
  2. N2O(g)+C(s)→CO(g)+N2(g)–131KJ    
  3. N2(g)+O2(s)→2NO(g);ΔE=+181KJ    
  4. C2H2(g)+2H2(g)→C2H6(g);ΔE=–314KJ    

The correct answer is: C2H2(g)+2H2(g)→C2H6(g);ΔE=–314KJ

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