Question

give reason
1) aluminum foil are used to wrap food items.
2) Immersion rods for heating liquids are made up of metallic substance.
3) Copper cannot displace zinc from its salt solution
4) Sodium and potassium are stored in kerosene. ​

Answer 1

⭐️ANSWER⭐️

⭐️Aluminium foil are used to wrap food items Because aluminium is malleable and can be made into thin sheets.

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

⭐️Copper cannot displace zinc from its salt solution because a metal can only displace a less reactive metal from its salt in an Aqueous solution but zinc is more reactive than copper.

⭐️Sodium and potassium are stored in kerosene because they are highly reactive elements. They can easily catch fire even when in contact with air.

Answer 2

Explanation:

(a) Aluminium foils are used to wrap food items because aluminium metal is malleable. Therefore, it can be beaten into thin foils.

(b) Metals are good conductors of heat and electricity. Therefore, immersion rods for heating liquids are made of metallic substances.

(c) A metal can displace a less reactive metal from its salt in an aqueous solution. But zinc is more reactive than copper. Therefore, copper cannot displace zinc from its salt solution.

Cu(s)+ ZnSO4 (aq) → No reaction

(d) Sodium and potassium are stored in kerosene because they are highly reactive elements. They can easily catch fire even when in contact with air.