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11.22.    Give reasons :

  (vi)  Aluminium utensils should not be kept in water overnight.

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Aluminium utensils should not be kept in water overnight because it reacts with water with the help of atmospheric oxygen and forms an oxide layer on the surface of utensils. When we kept water on this utensils for a long period of time, some amount of oxide dissolved in water which is harmful(water become basic in nature). 

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