Question

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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

Answer:

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Explanation:

a)Aluminium foils are used to wrap food items because aluminium being a soft malleable metal it can be beaten to in sheets to form thin wrapping sheets. Moreover it does not react with food items. Immersion rods are made of metallic substances metals are good conductors of heat and electricity.

b)Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity. The immersion rod needs electric supply to get heated and; in turn; to heat liquids.

c)In the reactivity series, zinc is more reactive than copper. A more reactive metal can replace a less reactive metal, but a less reactive metal cannot replace a more reactive metal. Thus, copper cannot displace zinc from its salt solution, while zinc can displace copper from its salt solution.

d)Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.

Answer 2

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(a) Aluminium foils are used to wrap food items.

$\huge\sf\pink{✿ \: AnsWeR : - }$

Aluminium foils are used to wrap food items because aluminium metal is malleable. Therefore, it can be beaten into thin foils. Metals are good conductors of heat and electricity. Therefore, immersion rods for heating liquids are made of metallic substances.

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(b) Immersion rods for heating liquids are made up of metallic substances.

$\huge\sf\pink{✿ \: AnsWeR : - }$

Immersion rods are made up of metallic substances. Immersion rods are made up of metallic substances because metals are good conductors of heat and electricity. They get hot very soon and allow to passage of current and warm water.

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(c) Copper cannot displace zinc from its salt solution.

$\huge\sf\pink{✿ \: AnsWeR : - }$

Zinc is more reactive than copper. A more reactive metal can replace a less reactive metal, but a less reactive metal cannot replace a more reactive metal. Thus, copper cannot displace zinc from its salt solution, while zinc can displace copper from its salt solution.

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(d) Sodium and potassium are stored in kerosene.

$\huge\sf\pink{✿ \: AnsWeR : - }$

Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.