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

Explain the zeolite method for softening of water giving suitable diagram and reactions. What are the limitations of this method. 

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.

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.

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

Write a note on Deccay of Concrete.

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.

What is activated sludge? How is the process carried out for treatment of waste water? Explain with a flow sheet diagram.

Write a note on Ultrafiltration method for purification of water.

Distinguish between temporary and permanent hardness of water.

Explain the principle of EDTA method .

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 .

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 .

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 ?

Draw the diagram for demineralization process and write suitable reactions involved in the process .What are the advantages and disadvantages of the method .

Explain Activated sludge method with the help of diagram

Write a short note on Reverse Osmosis .

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

Discuss the drawback of natural rubber.

What is the functions of fillers and plastisizers in the compounding of plastic?

Write the preparation, properties and uses of PMMA and Buna-S.