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Displacement  Reaction

1.In  Displacement  reaction  one  element displaces     another     element     from     its compound. Ex:  Fe(s)+Cuso4(aq)→Feso4(aq)+cu(s)

2.  Energy  is  not  required  in  any  form  for this  reaction.
3.Reactants  are  more  than  one.

Decomposition Reaction
1.     A     chemical     reaction     in     which     a substance  decomposes  to  form  two  or more  simpler  substances Ex:  CaCo3(s)→Cao(s)  +  Co2(g)
2.  Energy  is  required  in  the  form  of  heat or  light  or  electricity  for  this  reaction.
3.  Reactant  is  only  one  substance
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