Question

1how is rancidity different from decomposition ?

2are all double displacement reaction also precipitation reactions support like answer with example

Answer 1

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1) Rancidity means the aerial oxidation of food containing oil which causes food unfit for consumption.

Decomposition reactions are processes in which chemical species break up into simpler parts. 

2) No, recall the definition of a precipitate "insoluble ionic compound". Take this reaction into consideration

NaOH (s)+HCl (l)↽−−⇀H2O (l)+NaCl (aq)NaOH (s)+HCl (l)↽−−⇀HX2O (l)+NaCl (aq)

none of the products are insoluble. You'll learn more when you go over gas evolution reactions.

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Answer 2

1) When oil or fat or left over cooking oil for making food stuff undergoes oxidation if stored for a long time and it is found to have foul odour called rancidity.

2)The reaction in which theions in the reactants are exchanged to from a precipitate are called double displacement reaction.
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