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Important Questions for BE Automobile Engineering Semester 1 (FE First Year) - University of Mumbai - Applied Chemistry 1

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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.

Appears in 1 question paper
Chapter: [1] 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. 

Appears in 1 question paper
Chapter: [1] Water
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.

Appears in 1 question paper
Chapter: [1] Water
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.

Appears in 1 question paper
Chapter: [1] Water
Concept: Hardness of Water

Explain lon-exchange process for Softening of hard water. What are its advantages and disadvantages.

Appears in 1 question paper
Chapter: [1] Water
Concept: Ion Exchange Process and Numerical Problems

Write a note on Deccay of Concrete.

Appears in 1 question paper
Chapter: [1] Water
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.

Appears in 1 question paper
Chapter: [1] 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.

Appears in 1 question paper
Chapter: [1] Water
Concept: Sewage Treatment

Write a note on Ultrafiltration method for purification of water.

Appears in 1 question paper
Chapter: [1] Water
Concept: Hardness of Water

Distinguish between temporary and permanent hardness of water.

Appears in 1 question paper
Chapter: [1] Water
Concept: Hardness of Water

Explain the principle of EDTA method .

Appears in 1 question paper
Chapter: [1] Water
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 .

Appears in 1 question paper
Chapter: [1] 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 .

Appears in 1 question paper
Chapter: [1] 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 ?

Appears in 1 question paper
Chapter: [1] Water
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 .

Appears in 1 question paper
Chapter: [1] Water
Concept: Determination of Hardness of Water by Edta Method and Problems

Explain Activated sludge method with the help of diagram

Appears in 1 question paper
Chapter: [1] Water
Concept: Sewage Treatment

Write a short note on Reverse Osmosis .

Appears in 1 question paper
Chapter: [1] Water
Concept: Drinking Water Or Municipal Water

What is the role of polymer in medicine and surgery ?Explain with the help of any three examples?

Appears in 1 question paper
Chapter: [2] Polymers
Concept: Polymers in Medicine and Surgery

What is meant by Fabrication of plastics? Explain injection moulding with the help of neat diagram .

Appears in 1 question paper
Chapter: [2] Polymers
Concept: Fabrication of Plastic by Injection

Discuss the drawback of natural rubber.

Appears in 1 question paper
Chapter: [2] Polymers
Concept: Drawbacks of Natural Rubber
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