Question

32. Give reasons for the following:
a) Sodium and potassium are stored in kerosene.
b) Copper wires are commonly used in household cables.
c) Silver articles become black after sometime when exposed to air​

Answer 1

Answer:

Sodium and potassium are the most reactive metals. They are stored in kerosene because they react very vigrously with air and water because of the presence of oxygen. If they come in contact with oxygen then it will react and will form sodium hydroxide.

Sodium and potassium are very reactive metals and readily catches fire in the air. They cannot be kept in water as they react exothermically in water. Therefore they are stored in kerosene.