Question

6 give reasone for following

(a) Aluminium foils are used to wrap food items
(b) Immersion rods for heating liquids are made up of metallie substance
(c) Copper cannot displace zine from its salt solution
(d) Sodium and potassium are stored in kerosene
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Answer 1

Explanation:

Ans. (a) Aluminium is malleable, soft and does not react with food items, so it is used to wrap food items. (b) Metals are good conductor of heat and electricity, so immersion rods are made up of metallic substances. (c) Copper is less reactive than zinc, so it can not displace zinc from its salt solution.

Answer 2

Explanation:

a)Aluminium is highly malleable(can be make into thin sheets) and it does not react with food items and prevents spoilage of food

b)Because metals are good conductors of heat and electricity so they are used as immersion reds for heating.

c)Copper is less reactive than zinc and hence cannot displace zinc from its salt solution

d)Sodium and potassium are highly reactive metals so they are stored in kerosene to avoid exposure.

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