This document appears to be an exam for a Board Diploma Examination in Engineering Chemistry and Environmental Studies. It contains 18 questions across two sections - Section A contains 10 multiple choice questions worth 4 marks each, and Section B contains 4 long form questions worth 10 marks each. The exam covers topics such as atomic theory, chemical bonding, electrochemistry, corrosion, water quality, polymers, air pollution, and energy sources. Students are instructed to answer all questions in Section A, and to choose 4 questions to answer comprehensively in Section B. The exam is worth a total of 80 marks and allows 3 hours for completion.

1. 046
046
046
046
*
*
*
C14–CE–104/C14–CM–104
4017
BOARD DIPLOMA EXAMINATION, (C–14)
OCT/NOV—2016
DCE—FIRST YEAR EXAMINATION
ENGINEERING CHEMISTRY AND ENVIRONMENTAL
STUDIES
Time : 3 hours ] [ Total Marks : 80
PART—A 4×10=40
Instructions : (1) Answer all questions.
(2) Each question carries four marks.
(3) Answers should be brief and straight to the point.
1. (a) Write Pauli’s exclusion principle.
(b) Calculate oxidation number of Cr in K Cr O2 2 7 and Mn in
KMnO4.
2. (a) Write two differences between orbit and orbital.
(b) Draw the shapes of s and p orbital.
3. (a) Define saturated and unsaturated solutions.
(b) Calculate the equivalent weight of CaCO3 and H SO2 4.
4. (a) Find the pH of 0·02 M H SO2 4. (log 4 = 0·6021)
(b) Define acid and base according to Lewis theory.
/4017 1 [ Contd...
* 4 0 1 7 *

2. 046
046
046
046
*
*
*
5. (a) Calculate the e.m.f. of the cell Zn Zn M Cu M Cu/ ( )// ( )/+ +2 2
1 1 ,
where electrode potential (E°) of Zn/Zn+2
(1M) = –0·76 V and
Electrode potential (E°) of Cu M Cu V+
= + ×2
1 0 34( )/ .
(b) Define electrochemical series.
6. (a) Define degree of hardness of water and write its units.
(b) Define soft and hard water.
7. (a) What is polymerization? Name the types of polymerization.
(b) What is vulcanization? Write the structure of vulcanized
rubber.
8. (a) Define primary and secondary fuels.
(b) Write the composition and uses of producer gas.
9. (a) Define DO and TLV.
(b) Define pollutant and contaminant.
10. (a) Define water pollution.
(b) What are conventional energy sources? Give examples.
PART—B 10×4=40
Instructions : (1) Answer any four questions.
(2) Each question carries ten marks.
(3) Answers should be comprehensive and the criterion
for valuation is the content but not the length of the
answer.
11. (a) Write the postulates of Bohr’s atomic theory.
(b) What is ionic bond? Explain the formation of ionic bond with
an example.
12. (a) Define normality. Give the formula and units. Calculate the
normality of a solution prepared by dissolving 10 gm of NaOH
in 500 ml of the solution.
(b) Explain Arrhenius theory of acids and bases.
/4017 2 [ Contd...

3. 046
046
046
046
*
*
*
13. (a) Write a note on froth floatation.
(b) Define the terms ‘mineral’, ‘gangue’, ‘flux’, ‘slag’ and ‘ore’.
14. (a) Define electrolysis. Explain the electrolysis of molten NaCl.
(b) A current of 0·5 ampere is sent through a solution of CuSO4 for
20 minutes using platinum electrodes. Calculate the weight of
Cu deposited. (atomic weight of copper = 63·5)
15. (a) Define corrosion. Write four factors influencing the rate of
corrosion.
(b) What is rusting? Explain the mechanism of rusting of iron with
chemical equations.
16. (a) Calculate temporary and permanent hardness of water
containing the following salts per litre :
(i) Ca HCO mg( )3 2 32 4= ×
(ii) Mg HCO mg( )3 2 29 2= ×
(iii) CaSO4 = ×13 6mg
(iv) MgCl2 =19mg
(b) Write five disadvantages of using hard water in industries.
17. (a) Write the advantages of plastics over traditional materials.
(b) Write the preparation and uses of Buna-S and urea
formaldehyde.
18. (a) Define air pollution. Write any three causes of air pollution.
(b) Write the causes of deforestation.
H H H
/4017 3 AA6(T)—PDF