Question

Give reasons for the following:- (a) Aluminum 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. (e) Phosphorus is kept in water.​

Answer 1

Answer:

Explanation:

• Aluminium foils are used to wrap food items. ... (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.
• 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
• Metals are good conductor of heat and electricity. So immersion rods are made of metallic substance. (c) Copper is less reactive than zinc. Therefore copper cannot displace zinc from its salt solution.
• 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
• White phosphorus is highly reactive, and spontaneously ignites at about 30°C in moist air. It is usually stored under water, to prevent exposure to the air. It is also extremely toxic, even in very small quantities.