R05010104 A P P L I E D C H E M I S T R Y

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Code No: R05010104
Set No. 1
I B.Tech Supplimentary Examinations, Aug/Sep 2008
APPLIED CHEMISTRY
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. (a) What are the important sources of water ?
(b) What is the cause for alkalinity of natural water?
(c) How do you estimate the hardness of water by EDTA? [4+3+9]

2. (a) Compare the ion-exchange process with lime-so da process for softening of hard
water.
(b) A sample of water obtained from Karimnagar showed the following analysis:
CaC 2 = 11.1 ppm; Mg(N 3)2 = 14.8 ppm; MgS 4 = 12 ppm; Ca(HC 3)2 =
16.2 ppm; KCl = 7.45ppm. Calculate lime-soda required to soften (In Kgs)
5000 liters of water. [8+8]

3. (a) What is corrosion? How is it di erent from erosion? Explain the term passivity
with suitable examples.
(b) Give an account of the oxidation corrosion with relevant chemical equations
involved. [8+8]

4. Give an account of any eight characteristics of a good electrodeposition? [16]

5. (a) What are silicone resins ? How are they made and what are their uses?
(b) Discuss the preparation, properties and uses of bakelite resins. [8+8]

6. (a) Explain
i. the Segar Cones test
ii. Refractoriness Under Load test.
(b) Outline the important applications of refractories. [8+8]

7. (a) De ne and classify lubricants?
(b) What are the chemical and physical tests for lubricants? [4+12]

8. Explain the hardening and setting of cement using the chemical equations. [16]

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Code No: R05010104
Set No. 2
APPLIED CHEMISTRY
(Civil Engineering)

1. (a) Describe in brief, the EDTA metho d to determine the calcium hardness of
water.
(b) Calculate the total hardness of a sample of water in oFr and oCl which showed
the following analysis in ppm: Ca(HC 3)2 = 162; MgC 2 = 9.5; CaS 4 =
13.6; Mg(HC 3)2 = 14.6; Organic matter = 12.5; NaCl = 5.85. [8+8]

2. (a) Explain the scale and sludge formation in boilers.
(b) Calculate amount of lime (80%) and soda ( 90%) required to soften 12,000
litres of the water containing the following salts: CaC 3 = 185 ppm; CaS 4
= 34 ppm; MgC 2 = 76 ppm; organic matter = 84 ppm; SiO2 = 12ppm;
Ca(HC 3)2 = 220 ppm. [8+8]

3. Give reasons for the following statements.

(a) Water lled steel tank corrodes below the water line.
(b) A steel screw in a brass marine hardware corrodes fastly. [8+8]

4. Explain the following what happens and why it is happens [4x4=16]

(a) When a zinc plate is attached below a ship.
(b) When steel is alloyed with chromium homogeneously.

(c) When there are crevices between the adjacent parts of the structure.
(d) When there is no uniform ow of a corrosion liquid.

5. (a) Explain the di erence between thermoplastics and thermoset plastics.
(b) Outline the preparation, properties and uses of bakelite. [8+8]

6. (a) How do you measure [8]
i. thermal stability and
ii. strength of a refractory material ? Describe suitable tests to measure
them.
(b) Write a note on liquid insulating materials. [8]

7. (a) What are the important functions of lubricants?

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Code No: R05010104
Set No. 2
(b) A lubricating oil has a Say bolt universal viscosity of 59 seconds at 21 00F
and 560 seconds at 10 00F. The low viscosity index standard Gulf oil has Say
bolt universal viscosity of 59 seconds at 2100F and 760 seconds at 10 00F. The
high viscosity index standard Pennsylvanian oil gave the Say bolt universal
viscosity value 59 seconds at 21 00F and 460 seconds at 10 00F. Find the
viscosity index of lubricating oil. [8+8]

8. (a) What is Portland cement? Why is it so named?
(b) Explain the di erent ingredients of cement. [8+8]

2 of 2


Code No: R05010104
Set No. 3
APPLIED CHEMISTRY
(Civil Engineering)

1. (a) What do you understand by “potable water”.
(b) Discuss the phenomenon of break point chlorination.
(c) Calculate the concentration in moles/liter of CaCl2 solution if its hardness was
found to be 100 ppm. [6+4+6]

2. (a) What are soaps?
(b) What happens when soap is treated with hard water?
(c) Describe the ion-exchange process for softening of hard water. [3+4+9]

3. (a) What is corrosion? How is it di erent from erosion? Explain the term passivity
with suitable examples.
(b) Give an account of the oxidation corrosion with relevant chemical equations
involved. [8+8]

4. Give an account of any eight characteristics of a good electrodeposition? [16]

5. (a) What is Crepe rubber and how is it made?
(b) Describe the preparation, properties and uses of
i. Thiokol rubber
ii. Neoprene rubber. [6+6+4]

6. (a) Describe a general method to manufacture refractories.
(b) Outline their importance & applications.
(c) Write a note on askarels. [4+8+4]

7. Write short notes on:

(a) Flash and re points
(b) Cloud and pour point

(c) Carbon residue. [5+5+6]

8. With the help of ow diagram explain the manufacture of Portland cement by wet
pro cess. [16]

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Code No: R05010104
Set No. 4
APPLIED CHEMISTRY
(Civil Engineering)

1. (a) What are the important sources of water?
(b) Why rain water is the purest form of natural water?
(c) Calculate the temporary, permanent and total hardness in ppm units of a
sample of water containing the following salts: Mg(HC 3)2 = 14.6 mg/litre;
Ca(HC 3)2 = 16.2 mg/litre; MgCl = 9.5 mg/litre; CaS 4 = 13.6 mg/litre;
NaCl = 5.85 mg/litre; suspended impurities = 5.5 mg/litre. [4+2+10]

2. (a) Describe the Permutit process for the softening of hard water.
(b) Calculate the quantities in Kgs of lime-soda needed to soften 30,000 litres of
water having the following composition salts: NaCl = 5.85 mg/liter; KCl =
7.45 mg/litre; Ca(HC 3)2 = 40.5 mg/litre; Mg(HC 3)2 = 14.6 mg/litre;
Mg(N 3)2=14.8 mg/litre; CaC 2=22.2 mg/litre. Determine the quantities (in
Kgs) of lime and soda required for softening 10,000 liters of water.
[8+8]

3. (a) How do you di erentiate dry corrosion from wet corrosion?
(b) Explain Pilling-Bedworth rule with suitable examples. [8+8]
4. (a) What is the process for chromium plating? Explain the main ob jectives and
uses. Give reasons why chromium plating has nickel undercoat.
(b) Write a brief account on sherardizing. [10+6]
5. (a) Describe the composition of natural rubber.
(b) Explain the di erence between natural and synthetic rubber
(c) Write brie y on the compounding of rubber for engineering uses. [4+6+6]
6. (a) Classify refractories giving suitable examples.
(b) Explain the importance of various gaseous insulators.
(c) Write brie y on liquid insulating materials. [6+4+6]

7. (a) Outline the important functions of lubricants.
(b) Explain the mechanism of thick lm lubrication. [8+8]

8. (a) Give an account of the functions of the ingredients of cement.
(b) How is Portland cement manufactured by dry process? [6+10]

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R05010104 A P P L I E D C H E M I S T R Y

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