6 M

Choose correct answers for the following;

3(a)(i) Caustic embrittlement is an example of ,
A) Stress corrosion
B) Waterline corrosion
C) Differential metal corrosion
D) Differential aereation corrosion

1 M

3(a)(ii) The process of increasing the thickness of oxide layer on non ferrous metals by electrolytic oxidation is called ,
A) Phospating
B) Anodizing
C) Galvanising
D) None of these

1 M

3(a)(iii) Galvanising is an example of,
A) Catodic metal coating
B) Anodic metal coating
C) Anodizing
D) Phosphating

1 M

3(a)(iv) The corrosion inhibitor used to prevent corrosion on metal structure is,
A) Chromates
B) Carbonates
C) Bicarbonates
D) All of these

1 M

3(b) Explain the electrochemical theory of corrosion with reference to iron .

5 M

3(c) Explain the influence of following factor on the rate of corrosion ;
(i) Nature of corrosion product.
(ii) pH and
(ii) Tempreature

6 M

3(d) What is cathodic protection ? Explain sacrificial anode method.

5 M

4((c) Define the following terms; (i)Polarization
(ii) Decomposition potential and (iii) Over voltage

6 M

Choose correct answers for the following;

4(a)(i) The ability of the plating bath to develop uniform coating on the entire surface of object is measured by its,
A) Current density
B) Plating power
C) Throwing power
D) None of these

1 M

4(a)(ii) Reducing agent used in electroless nickel plating is
A) Sodium hypophosphite
B) Sodium Succinate
C) HCHO
D) CH₃COONa

1 M

4(a)(iii) In electroplating the article to be plated is subjected to pickling , this is to,
A) Remove grease
B) Increase rate of plating
C) Get a bright deposit
D) Remove oxide scale.

1 M

4(a)(iv) Printed circuit boards are prepared by the process of,
A) Electroplating
B) Electroless plating
C) Throwing power
D) None of these

1 M

4(b) Explain the effect of the following plating varibles on the nature of electro deposit.
(i) pH of the electrolytic bath
(ii) Tempreature

4 M

4(d) What is electroless plating ? Give any two difference between electroplating and electroless palting . Explain the process of electroplating of chromium.

6 M

Choose correct answers for the following;

5(a)(i) Catalyst used in fluidized catalytic craking is, A) Platinum
B) Cr₂O₃
C) Al₂O₃
D) Al₂O₃+SiO₂

1 M

5(a)(ii) Biodiesel is produced by,
A) Distillation
B) Degradation
C) Esterification
D) Trans esterifiaction

1 M

5(a)(iii) A reference mixture used to find the cetane number of petrol is,
A) n-heptane & iso octane
B) n-heptane and pentane
C)αmethyl naphthalene+Hexadecane
D) None of these

1 M

5(a)(iv) Photovoltaic cell converts,
A) Solar energy into electriacl
B) Chemical energy into electrical energy
C) Electrical energy into chemical energy
D) All of these

1 M

5(b) What are chemical fuels? How chemical fuels are classified ?

4 M

5(c) Explain how calorific value of solid fuel is determined by bomb calorimeter.

5 M

5(d) Define the term petroleum cracking. Explain any three reactions invovled in reformation of petrol.

7 M

Choose correct answers for the following;

6(a)(i) In potentiometric analysis, platinum electrode is used as,
A) Indicator electrode
B) Reference electrode
C) Ion selective electrode
D) All of these

1 M

6(a)(ii) Flame photometer is based on ,
A) Atomic absorption
B) Molecular absorption
C) Atomic emission
D) All the above

1 M

6(a)(iii) Condensed phase rule is applicable to ,
A) One component system
B) Two component system
C) Three component system
D) Multi component system

1 M

6(a)(iv) At eutectic point the compostion of lead and silver has,
A) Lower B.P
B) Highest B.P
C) Lowest M.P
D) Highest M.P

1 M

6(b) Explain the terms phase, component and degree of freedom with an example involved in the satement of phase rule.

6 M

6(c) Explain the application of phase rule to one component system.

5 M

6(d) Explain the theory and applications of colorimetry in the estimation of copper.

5 M

Choose correct answers for the following;

7(a)(i) Natural rubber is the polymerized form of,
A)Isoprene
B) Chloroprene
C) Propene
D) Syrene

1 M

7(a)(ii) A plastic which can be softened in heating and hardened on cooling is called,
A) Thermoplastic
B) Thermo setting plastic
C) Thermoelastic
D) None of these

1 M

7(a)(iii) Polymer composites consists of,
A) Matrix and Plasticizer
B) Fibre and Matrix
C) Fiber and Plasticizer
D) All the above

1 M

7(a)(iv) Condensation polymerization is also called as,
A) Step growth polymerisation
B) Chain growth polymerization
C) Copolymerisation
D) None of these

1 M

7(b) Discuss the free radial mechanism of polymerization taking ethylene as a momomer.

4 M

7(c) Give the synthesis and applicationsof,
(i) PMMA
(ii) Epoxy resin

6 M

7(d) What is glass transition tempreature? Mention the factors that influence Tg. Define conducting polymer and give an example.

6 M

Choose correct answers for the following;

8(a)(i) Alkalinity of H₂O is due to the presence of,
A) Hydroxide ions
B) Carbonate ions
C) Bicarbonate ions
D) All of these

1 M

8(a)(ii) The indicator used in total hardness determination is,
A) EBT
B) Patton & Reeder
C) Methyl orange
D) Phenoltphthalene

1 M

8(a)(iii) The indicator used in total hardness determination is,
A) Zr-SPADNS
B) NH₃
C) BaCl₂ D) Phenol disulphonic acid

1 M

8(a)(iv) As the tempreature increases, the amount of dissolved O₂ of water sample
A) Increases
B) Decrease
C) Has no effect
D) None of these

1 M

8(b) Explain gravimetric method of estimation of sulphate

4 M

8(c) Define COD and BOD, 25cm³ of an effluent sample requires for oxidation 8.3 cm³ of 0.001 M K₂Cr₂O₇ Calculate the COD of the effluent sample .

5 M

8(d) Mention the impurities present in natural water. Explain reverse osmosis process of desalination of water.

7 M