Level 01
Observe the picture and mention few water pollutants in the box.
level-01
Drag and drop your options here:-
Level 02
Find appropriate method to determine water pollution

Water pollution can be determined by the amount of dissolved oxygen. The amount of dissolved oxygen in a water sample tells us about the quality of water. There are two dissolved oxygen scales, Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD).

Identify BOD and COD from following: -
Level 03
Choose the appropriate method for Industrial Wastewater

What is Industrial Wastewater?

Common industrial pollutants responsible for causing water pollution are sulphur, asbestos, noxious solvents, polychlorinated biphenyls, lead, mercury, nitrates, phosphates, acids, alkali, dyes, pesticides, benzene, chlorobenzene, carbon tetrachloride, toluene and volatile organic chemicals such as sulphur are harmful to marine life, while asbestos is known to be a potential carcinogen

Select Red pill for COD

OR

Select Blue pill for BOD
blue-pills red-pills
Level 04
The oxidizing ability of K2Cr2O7 is pH dependent.
The pH of reaction mixture has to be _________

Acidic

Basic

Level 05

Select a strong oxidising agent to be put in burette.

?Select the oxidising agents from given list.

HNO3 KMnO4 K2CRO4 HgSO4 K2Cr2O7
Level 06

To change from Cr (+6) to Cr (+3) oxidation state, dichromate needs a lot of acid. What do you think, which is the most suitable acid?

?Select the acid

HNO3
H2SO4
HCl
Level 07

In COD determination, the chloride ions present in water cause interference in the estimation

?Fill in the blanks

6Cl- + Cr2O72- + 14H+ ⟶ ____ + 2Cr3+ + 7H2O

3Cl2

3Cr

3H2

?So, to get rid of that which reagent must be added?

HNO3 KMnO4 K2CRO4 HgSO4 K2Cr2O7
Level 08

The oxidizing agent dichromate oxidizes organic and inorganic matter in the sample. After digestion, the amount of excess potassium dichromate will give the amount of potassium dichromate got used up in the oxidation of waste matter in water.

?Select the burette solution which will react with the excess dichromate solution.

NaOH K2CRO4 F.A.S HNO3 KMnO4