Question

Activity - 1
Give reason for the following statements
1) Tamarind is not Stored in Aluminium vessels
2) Stainless steel knives are used instead of iron
Knives for cutting citrous fruits.
3 )sodium metal is usually stored in kerosene
4)when copper plate is rubbed with and paper,
it becomes shiny​

Answer 1

Answer:

1.The reason is the fact that aluminium readily reacts with oxygen present in the atmosphere and produces aluminium oxide.so tamarind should not be cooked or kept in vessels.

3.sodium is a highly reactive metal and reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. to prevent this sodium is stored in kerosene.

4.copper and lead is shiny after rubbing on Sand paper.metals have a lustre as their physical property.therefore they shine after being rubbed on Sand paper