-
mnsoomro
Posts
Permanent hard water is softened by addition of
MgCO3 CaCO3 Na2CO3 BaCO3 Submitted by :- Muhammad Nawaz
Temporary hard water is softened on industrial scale by adding
Ca(OH)2 Mg(OH)2 KOH NaOH Submitted by :- Muhammad Nawaz
Permanent hardness of water is due to
Sulphate of Ca Sulphate of Mg Chloride of Ca All of these Submitted by :- Muhammad Nawaz
Water is often treated with chlorine to:
Increase oxygen content Remove suspended particles Remove hardness Kill germs Submitted by :- Muhammad Nawaz
Biodegradable pollutant is:
Plastic Sewage Asbestos Mercury Submitted by :- Muhammad Nawaz
The minimum value of DO required for water to be pure is:
1 ppm 2 ppm 3 ppm 4 ppm Submitted by :- Muhammad Nawaz
Which of the following is secondary pollutant?
PAN CO₂ CO Aerosol Submitted by :- Muhammad Nawaz
Which statement is/are true regarding particulate matter?
They are responsible for cloud and fog formation They determine the heat balance of the earth through reflection of radiation…
Earth is protected from UV radiations by which of the following?
Carbon dioxide layer Oxygen layer Troposphere Ozone layer Submitted by :- Muhammad Nawaz
Ozone depletion in stratosphere will result in which of the following?
Increased incidence of skin cancer Forest fires Global warming Acid rain Submitted by :- Muhammad Nawaz