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BALLARPUR INSTITUTE OF TECHNOLOGY

SESSIONAL EXAMINATION-I

Applied Chemistry

Time: 2Hrs Max Marks: 40

SECTION A

Que.1

a)Explain cold lime soda process of water softening with reactions involved in it.(4 marks)

b)What is sterilization? Explain Break Point Chlorination. (4 marks)

c)Explain Coagulation. (2 marks)

ORQue.2

a)What is the principle of zeolite process? Write advantages, disadvantages and limitations of

zeolite process. (5 marks)

b)Discuss the principle involved and details of any of the ion exchange water softening

processes. (5 marks)

Que.3

a)A water sample on analysis:

i.Ca(HCO3)2= 81ppm

ii.Mg(HCO3)2= 73ppm

iii.Mg(NO3)2= 74ppm (7 marks)

iv.MgCl2= 95ppm

v.NaCl = 58.5ppm

Calculate the quantities of lime (90% pure) and soda (95%pure) required for the

softening of 80000 lit of water using NaAlO2 coagulant at the rate of 16.4ppm.

b)Hardness of 20,000 litre of water was removed by a zeolite softener. The zeolite required 320

litre of 1.5% brine for regeneration. Calculate hardness of water. (3 marks)

OR Que.4

a)Water sample on analysis gave the following data: (7 marks)

CaCO3=75ppm, Mg(HCO3)2= 73ppm, MgSO4= 30ppm,

Dissolved CO2= 10 ppm, CaCl2= 166.5 ppm,

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MgCl2= 190ppm.

Calculate: i) Temporary and permanent hardness.

ii) Theoretical quantities of lime (90%pure) and soda (95% pure) required to

soften 100,000 liters of water.

c)Hardness of 10,000 litre of water was removed by a zeolite softener. The zeolite required 30

litre of 8.5% brine for regeneration. Calculate hardness of water. (3 marks)

SECTION B

Que.5

a)Write informative note on (any three): (6 marks)

i)Water line corrosion

ii)Intergranular corrosion

iii)Microbiological corrosion

iv)Pitting corrosion

b)Explain electrochemical theory of corrosion. (4 marks)

OR Que.6

a)Explain why: (10 marks)

i) Corrosion is reverse of extractive metallurgy.

ii)Iron corrodes faster than Aluminium even though iron is placed below Aluminium inthe electrochemical series.

iii)A pure metal rod, half immersed vertically in water starts corroding at the bottom.

iv)Steel pipe connected to copper plumbing gets corroded?

v)Rusting of iron is quicker in saline water than in ordinary water.

Que.7

a)What is green house effect? What are the major gases responsible for Green house effect

and how are they released into the atmosphere? What are the causes and consequences ofuncontrolled global warming? (6 marks)

b)How is Ozone layer formed and depleted in the stratosphere? Explain the causes and

consequences of Ozone depletion. (4 marks)

OR Que.8

a)Write short note on: (10 marks)

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i)Acid Rain

ii)Photochemical smog

iii)Effect of common air pollutants on human being.

iv)Catalytic converters

v)Primary methods of waste water treatment.