Question

name the phenomenon due to which the taste and smell of oily objects change when left for some time.state the reason for this suggest one method to prevent it

Answer 1

when fats and oils are oxidised , they become rancid and the smell and taste change. usually substances which prevent the oxidation are added to the food containing oils and fats . keeping food in airtight container helps slow down oxidation process
process is called rancidity

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Answer 2

Hello Friend

The phenomenon is Rancidity . It is the condition produced by the aerial oxidation of fats and oils in food .

One method to prevent it :-

By adding antioxidants to food containing fats .

Hope this might helps you .