Question

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 1

Question given:

To give reason for the sentences given:

Answer:

⟹sтαтємєηт:

•Aluminium foils are used to wrap food items.

Reason:

Aluminium foils are used to wrap food items because aluminium metal is very much malleable and they can be beaten into thin foils. Thus, it helps to wrap the food items that keep the food items safe.

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⟹sтαтємєηт

•Immersion rods for heating liquids are made up of metallic substances.

Reason:

Immersion rods for heating liquids are made of metallic substance because metals are good conductors of heat and electricity.

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⟹sтαтємєηт

•Copper cannot displace zinc from its salt solution.

Reason:

There is property in metal that metals can displace a less reactive metal from its salt in an aqueous solution.

But in the statement given zinc is more reactive than that of copper.

Thus ,copper displaces zinc from its salt Solution.

Cu(s) + ZnSo4(aq) ⟹ No reaction

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⟹sтαтємєηт

•Sodium and potassium are stored in kerosene.

Reason:

Sodium and Potassium are being placed under kerosene because they catches fire very simultaneously whenever they contact with air(oxygen).

And they are also considered as highly reactive metals also.

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Answer 2

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(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.

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