Question

please answer them quickie​

Answer 1

1. the valency of Helium is 0 because it is a noble gas
2. common salt because Sodium + Chlorine gives sodium chloride
3. galvanization
4. the process of removal of waste is called excretion
5. red pigment of the blood is called haemoglobin

Answer 2

Answer:

the valency of helium is zero...

air is a mixture...

lusting of iron can be prevented by glavanisation...

the removal of wastes from the body is called excretion...

Red pigment present in the blood is called haemoglobin...