Chemistry
State in brief, the preventive steps to control the pollution of water bodies in the locality.
Answer
The following preventive steps can control the pollution of water bodies in the locality —
- Collection and disposal of domestic sewage — A typical waste water system for sewage consists of a network of waste water pipes.
Sewer Lateral Pipes — These waste water pipes collect sewage from household.
Sewer Main Pipe — It is the larger pipe on the main street which connects from sewer lateral pipe. The waste water from this pipe is then led to the Water treatment plant. - Water treatment plant — In a water treatment plant, the waster water goes through the below stages to remove the pollutants and impurities from it, thereby controlling water pollution:
- Screen
- Coagulation
- Sedimentation
- Filtration
- Disinfection
Related Questions
Using given samples of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you:
(a) Distinguish between hard and soft water.
(b) Distinguish between temporary hard water and permanent hard water.
(c) Remove temporary hardness from water without using a chemical compound.
(d) Remove temporary hardness and permanent hardness from water using a chemical compound.
(e) Prove the advantage of detergent over soap.
State the meaning of the term 'water pollution'. State how would you find out the different sources of pollution of water bodies in the locality.
Select the correct gas from A to F which matches with the description 1 to 5.
A: CO2
B: SO2
C: NH3
D: Water vapour
E: Cl2
F: H2S- Turns moist blue litmus red and then bleaches it.
- Turns moist red litmus paper blue.
- Turns lime water milky and blue litmus paper slightly pink.
- Turns cobalt chloride paper from blue to pink.
- Turns lead acetate paper from white to silvery black.
Select the correct salt from list II which on thermal decomposition exhibits the change in colour from list I - 1 to 5
List I List II 1. Light green to black A: Copper carbonate 2. White to yellow [heated state] B: Hydrated copper sulphate 3. Blue to black C: Copper nitrate 4. Orange to green D: Ammonium dichromate 5. Blue to white E: Zinc nitrate