Question

Give reasons for the following. Aluminium foils are used to wrap food items. Immersion rods for heating liquids are made up of metallic substances. Copper cannot displace zinc from its salt solution. Sodium and potassium are stored in kerosene

Answer 1

aluminium foils are not reactive with eatable items and also they are very malleable and copper is less reactive the zinc as per reactivity series and sodium like metals are highly volatile in air and water so to prevent them we put them in kerosene

Answer 2

1.aluminium form a protective covering(Al203) against the rust.
2.metal are good conductor of heat.
3.copper is less reactive than zinc
4.They are very reactive even they react with water,air .