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 Iron from its salt solution.

d) Sodium and potassium are stored in Kerosene.

Answer 1

a) Aluminium has high malleability. So it is very easy to make aluminium foil compared other metals.

b) Because metals are good conductors of electricity. 

c) Iron has more reactivity than copper. So copper cannot displace Iron from its salt solution. 

d) Sodium and potassium have high reactivity with water and an even they burn in the presence of air and water. So these metals are stored in Kerosene.