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

Distinguish between thermoplastic and thermosetting resins. ?

Calculate the quantity of the pure lime and soda required for softening of 1,00,000 litres of water containing the following impurities in ppm. The purity of lime is 70% and soda is BS% Ca(HCO₃) = 30.2 , Mg(HCO₃) = 20.8 ,CaCI₂ = 28.1 ,MgCl₂ = 8.78, CaSO₄ = 35, MgSO₄ = 6.7 .

Discuss the treatment of water using bleaching powder

Calculate the total hardness in ppm in given water sample.
: 50ml of standard hard water , containing 1mg pure CaCO₃ per ml consumed 20ml EDTA solution.
: 50ml of water sample consumed 30ml EDTA solution using EBT indicator.

Distinguish between BOD and COD. 

Give the preparations, properties and uses of Kevlar. 

Giass transition temperature 

Vulcanisation

What are the functions of lubricants.

What are the limitations of Phase rule?

Distinguish between alkaline and non alkaline hardness?

6ml of waste water was refluxed with 25ml ofK₂Cr₂ O₇ solution and after refluxing the excess unreacted dichromate required 20ml of 0. 1 N FAS solution. A blank of distilled water on refluxing with 25 ml of K₂Cr₂O₇ solution required 35ml of 0. 1 N FAS solution . Calculate the COD of the waste water sample.

The hardness of 85000 litres of water sample was removed by passing it through a zeolite softener. The zeolite required 2000 litres of NaCl solution containing 190 mg/lit of NaCl for regeneration. calculate the hardness of sample.

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

What are the advantages of ion exchange process?

A 1Oml of sample of water was refluxed with 20ml potassium dichromate solution and after refluxing the excess unreacted dichromate required 26.2ml of 0. 1M FAS solution. A blank 1Oml of distilled water on refluxing with 20ml of dichromate solution required 36ml of 0. 1M FAS solution. Calculate the COD of waste water . 

Calculate the amount of lime (85% pure) and soda (95% pure) required to soften one million litre of water which contains CaCO₃ = 12. 5ppml MgCO₃ = 8.4ppml
CaCl₂ = 22.2ppml ,  MgCl₂ = 9.5ppml C0₂ = 33ppml HCI = Z3ppml  organic matter= 16.Bppm 

What are cation and anion exchangers?

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.

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