Gas Bleaching powder is used as
disinfectant for water to:
O Make water tastier
Make water germ-free
O O O
Remove all the dirt from wat
O Make water clear

Wheres the answers to the question

The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.