The air around smelting industries is likely to contain

Kerosene is commonly used to remove the red colour stain of palm oil from cloths because it

The gas that is the most dangerous pollutant to human is

Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and

How many moles of limestone will be required to produce 5.6g of CaO?
[Ca = 40, C = 12, O= 16]