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Chemistry 2012

The document is an examination paper for a second semester diploma in Engineering/Technology, specifically in Applied Science-II (Chemistry). It consists of three parts: Part-A includes short answer questions, Part-B contains full questions requiring detailed answers, and Part-C requires students to answer one full question from each unit. The questions cover various topics in chemistry, including electrochemistry, corrosion, hydrocarbons, and polymerization.

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39 views2 pages

Chemistry 2012

The document is an examination paper for a second semester diploma in Engineering/Technology, specifically in Applied Science-II (Chemistry). It consists of three parts: Part-A includes short answer questions, Part-B contains full questions requiring detailed answers, and Part-C requires students to answer one full question from each unit. The questions cover various topics in chemistry, including electrochemistry, corrosion, hydrocarbons, and polymerization.

Uploaded by

athira.av009
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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TED (10)-10168 Reg. No.

(REVTSTON-20i0) Signature

SECOND SEMESTER DiPLOMA EXAMINATION IN ENGINEERING/


TECHNOLOGY-MARCH, 201 2

APPLIED SCIENCE-II (CHeuIsrnv)


(Common except DCP and CABM)
lTime: 1% hours
(Maximum marks : 50)

Marks
PART-A
(Answer the foliowing questions in one or two sentsnces. Each question carries 2 marks.)

I Give reason and explain the following observations :

1. Aqueous solution of raw sugar becomes colourless when passed over animal
charcoal. 2

2. Air becomes dry in presence of silica gel. 2

PART-B
(Answer any two full questions. Each question carries 8 marks.)

[ 1. Reduction potentials of Zn and Ag electrodes are -0.76 V and 0.80 V


respectively :

(a) Which one is a better oxidizing agent ?

(b) Which metal displaces the other metal from its solution 4

2. (a) What is the effect of temperature on electric conduction on metallic and


electroly'tic conductors ?

(b) Rate of con'osion is more near to seashore area. Explain your reason. 4

III 1. How will you represent Daniel ceii ? Write the electrode reactions and cell
reaction. 4

2. What is London smog ? What are the environmental impact of photochemical


smog ? 4

IV f . identify the functional group in the following molecules :

(a) CH, COOCH, ; CH3 O CH3

(b) Write the possible isomers of CoH,o. 4

2. Iliustrate with two examples :

(a) Saturated and unsaturated hydrocarbons.


(b) Condensation polymerization. 4

t1161 [n.r.o.
Marks

PART-C
(Answer one fiilLquestion from each unit. Each question carries 15 marks.)

UNIr-I
i. Physisorption can be changed to chemisorption. Illustrate with examples.
2. (a) Explain the electrochemical theory of corrosion.
(b) Galvanization. 4

3. Write down the cell reaction NiiCd cell. How do represent it ? 4

4. Sketch Or.-H., fuel cell and cell reaction involved in it. 3

On

VI 1. Explain the eiectrolysis of molten NaCl. 4

2. How are electrochemical cell classified and compare them with examples ? 4

3. What are different types of barrier protections ? 4

4. Which part of the iron corrodes if it partially immersed in an electrolyte ? Give


reason.

UNrr-II

vII 1. (a) How you distinguish betwegg_g1r1!9g and unsaturated hydrocarbon ?


(b) Give two examples of nuclear fuels.
2. (a) Mention the process used to improve the properties of rubber.
(b) What are the monomers in Buna-S and Buna-N ?
J- High boiling gasoline fractions are not good fuels. Suggest a suitable process to
convert them into good fuels. 4
A
How does ozone iayer depletion happens ? J

On

Vru 1. What are different type of polymerizations ? Give examples. 4

2. What are the differences between thermoplastic and thermosetting plastic ? 4

J. What is mean by propellants ? How are they classified ? 4

4. How does rain becomes acid rain ? J

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