Question

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05. Give reasons:
(a) Sodium and potassium are stored in kerosene,
(b) Lemon pickle should not be stored in aluminium utensils,
(c) Copper is preferred to make electrical wires,
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Answer 1

Answer:

(a) 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.

(b) As lemon pickle is an acid and aluminum is a metal and metals react with acids to produce hydrogen gas. So, it is not advisable to store lemon pickle in an aluminum utensil because it will spoil the pickle and holes will be formed in the vessel.

(c) Copper is used for making electrical wires that are used by your New Haven electrician due to its properties that make it an ideal metal for this purpose. ... Excellent Conductor of Electricity: Copper is an excellent conductor of electricity; no other metal can compete with it in terms of electrical conductivity.

Answer 2

Answer:

Sodium and potassium are stored in kerosene as they are highly reactive element and have the capability of catching fire event in contact with air

lemon pickle content asset which can spoil the pickle acid react with aluminium liberating hydrogen gas therefore lemon pickle cannot be stored in aluminium utensil

copper is preferred to make electrical wires because they are good conductor of electricity