Give one example of a combination reaction which is also exothermic.

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When quicklime or calcium oxide (CaO) reacts with water, slaked lime [Ca(OH)2] is formed. During this reaction, a large amount of heat is released. So, this reaction is an exothermic reaction.
CaO(s) + H2O(l)   ------>Ca(OH)2(aq) +Heat
calcium oxide    water                calcium  hydroxide
  (Quicklime)                                                   (slaked lime)
                                                                

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