CSVTU, 1 st year , 1st sem , Examination, Dec-Jan 2008-2009 , Applied Chemistry

BE (1st Semester)

Examination, Dec-Jan  2008-2009

Applied Chemistry


Q1 (a)  What is hardness of water? Name two chemicals responsible for permanent hardness.

(b)  (i) Why alkalinity of water cannot be due to the presence of OH, Co3 and HCo3 at a time ? A sample of water was alkaline to both phenolphthalein and methyl orange. Some of the water sample required 18 ml of 0.02 N H2SO4 for phenolphthalein end point and another 6ml for compete neutralization.

(ii) Write short notes on any one of the following:

(a) Phosphate conditioning      (b) Caustic embitterment

(C) (i) Compare permuted and lime-soda process at least on four points.

(ii) What is the aim of internal conditioning?

(iii) Calculate the amount of lime and soda required for the softening of 50,000 liters of hard

water containing MgCo3– 144 ppm; CaCo3 – 25 ppm; MgCh – 95 ppm; CaCI2 – 111 ppm and

Na2So4 —20 ppm

(d) (i) The hardness of 50,000 liters of a sample of water was removed by passing it through a elite softener. The softener then required 300 liters of sodium chloride solution containing 100g/Iitre of sodium chloride for regeneration. Calculate the hardness of the sample of water sample

(ii) Write a short note on any one of the following:

(a)Priming and Foaming    (b) Scale and Sludge


Q2 (a) what are secondary fuels? Give examples.

(b) Define ‘Net Calorific value’ and Gross calorific value A sample of coal contains 89%C, 8%H, and 3% ash. When this coal was tested in the laboratory for its calorific value in the bomb calorimeter, the following data was obtained

(a)          Wt. of the coal burnt                                                = 0.85 gm.

(b)         Wt. of the water taken                                              = 650 gm.

(c)          Water equivalent of bomb and calorimeter   = 2500 gm.

(d)         Rise in temp.                                                                 =2.5°C

(e)         Cooling correction                                                      = 0.03°C

(f)           Fuse wire correction                                                 =10cal.

(g)          Acid correction                                                        = 50 cal.

Assuming the latent heat of condensation of steam as 580 cal/ gm, calculate : (x) Gross and (y) net calorific values of the coal in cal/gm.

(c) (i)  Give two disadvantage of each of moisture, volatile matter and ash in the coal.

(ii)  Give two advantages of higher percentage of fixed carbon in the coal.

(iii) Give definition of ‘non-coking’ coking and coking’ coal

(d) (i)The percentage composition of a sample of bituminous coal was found to be as follows :

C = 75.4%: H = 5.3 %: O – 12.6%: N = 3.2% S = 1.3% and rest is ash.

Calculate the minimum Wt. of air necessary for complete combustion of one kg of coal

(ii) Write a short note on any one of the following:

(a) Comparison of petrol and diesel fuel

(b)Advantages of analysis of fuel gases.

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