A 10ml of sample of waste water was refluxed with 20ml of potassium dichromate solution and after refluxing the excess unreacted dichromate required 36.2ml of 0. 1M FAS solution. A blank of 1Om/ of distilled water on refluxing with 20ml of dichromate solution required 46ml of 0. 1M FAS solution. Calculate the COD value of waste water.
Concept: COD- Definition and Significance
Explain the zeolite method for softening of water giving suitable diagram and reactions. What are the limitations of this method.
Concept: Zeolite process and numerical problems
Calculate the amount of lime {80 %purity) and soda {90% purity) required for softening of 50,000 of hard water whose chemical analysis results are given below. Ca(HCO3 ) = 40.5 mg/L, Mg( HCO3)2 = 73.0 mg/L, MgSO4 = 60.0 mg/L, CaSO4 = 34.0 mg/L, CaCl2 = 27.5 mg/L and NaCI = 20.0 mg/L.
Concept: Softening of water by Hot and Cold lime Soda method and numerical problems
Ten thousand litres of hard water was made soft with zeolite. The exhausted zeolite required a total amount of 8 lit of NaCl solution containing 150 gm per litre for regeneration. Calculate the hardness of water.
Concept: Hardness of Water
Explain lon-exchange process for Softening of hard water. What are its advantages and disadvantages.
Concept: Ion Exchange Process and Numerical Problems
Write a note on Deccay of Concrete.
Concept: Softening of water by Hot and Cold lime Soda method and numerical problems
15000 litres of hard water was passed through a zeolite softener. The exhausted zeolite required 120 litres of NaCI having stream of 30g/l of NaCL Calculate the hardness of water.
Concept: Hardness of Water
What is activated sludge? How is the process carried out for treatment of waste water? Explain with a flow sheet diagram.
Concept: Sewage Treatment
Write a note on Ultrafiltration method for purification of water.
Concept: Hardness of Water
Distinguish between temporary and permanent hardness of water.
Concept: Hardness of Water
Explain the principle of EDTA method .
Concept: Determination of Hardness of Water by Edta Method and Problems
20 ml sample of waste water was refluxed with 30 ml of potassium dichromate solution and after refluxing the excess unreacted dichromate required 11 ml of 0.1 N FAS solution . Blank of 20 ml of distilled water on refluxing with 30 ml of dichromate solution required 14 ml of 0.1 N FAS solution . Calculate the COD value of waste water .
Concept: Sewage Treatment
A sample of water contains following impurities :
Mg(HCO3)2 =73 mg/lit , MgSO4 = 120 mg/lit , CaCl2 = 222 mg/lit and Ca(NO3)2 = 164 mg/lit . The purity of lime is 74% and soda is 90% . Calculate the quantity of lime and soda needed for softening of 50,000 litres of water .
Concept: Softening of water by Hot and Cold lime Soda method and numerical problems
A zeolite softener was completely exhausted and was generated by passing 1000 litres of NaCl .How many litres of a sample of hardness 500 ppm can be softened by this softener ?
Concept: Hardness of Water
Draw the diagram for demineralization process and write suitable reactions involved in the process .What are the advantages and disadvantages of the method .
Concept: Determination of Hardness of Water by Edta Method and Problems
Explain Activated sludge method with the help of diagram
Concept: Sewage Treatment
Write a short note on Reverse Osmosis .
Concept: Drinking Water Or Municipal Water
What is the role of polymer in medicine and surgery ?Explain with the help of any three examples?
Concept: Polymers in Medicine and Surgery
What is meant by Fabrication of plastics? Explain injection moulding with the help of neat diagram .
Concept: Fabrication of Plastic by Injection
Discuss the drawback of natural rubber.
Concept: Drawbacks of Natural Rubber
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