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Q.6 Give reasons for the following.
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene
Answer :

a) Aluminium is malleable and can be drawn into thin sheets hence Aluminium foils are used to wrap food items
b) Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity.
c) Copper cannot displace zinc from its salt solution because Zinc is more reactive than copper.
d) Sodium and Potassium are highly reactive metals which readily reacts with atmospheric Oxygen to catch fire hence Sodium and Potassium are stored in kerosene.