give reasons for each of the following
Answers
Answer:
1)to prevent rancidity
2)they Sodium is kept in kerosene because it is a highly reactive metal. ... Kerosene oil does not react with sodium and acts as a barrier which restricts its reaction with oxygen and moisture.
3)Silver is more noble metal than copper. It can not displace copper from its aqueous solution. Because
4)coppper has lesss restivity
5) corrosion of copper
Answer:
a) Aluminium is malleable, soft and does not react with food items, so it is used to wrap food items.
b) Sodium and Potassium are stored under oil because in contact with moist air containing carbon dioxide, they are covered with carbonate layer.
c) Silver is more noble metal than copper. It can not displace copper from its aqueous solution. Because the reduction potential of Ag is higher than the reduction potential of copper.
d) Copper is used for electrical wiring because it is a good conductor of electricity.
e) Copper naturally turns green over time as it reacts with oxygen in the air – a chemical reaction known as oxidation.