Maharashtra State Board of Technical Education 2012-1st Sem Diploma Computer Engineering for in Computer Science and EngineeringSubject :- Basic Chemistry(12002) - Question Paper
MSBTE ques. paper for Diploma in Computer Science and Engineering
First Semester
Subject :- Basic Chemistry(12002)
Instructions : (1) All Questions are compulsory.
Seat No.
|
\ |
A |
A |
*7 |
6. |
(2) Illustrate your answers with neat sketches wherever necessary.
(3) Figures to the right indicate full marks.
(4) Assume suitable data, if necessary.
Marks
1. Attempt any TEN of the following : 20
(a) State Hunds rule with one example.
(b) Calculate the atomic number and atomic mass number of an atom containing 20 electrons and 20 neutrons.
(c) Define conductor and insulator.
(d) State Faradays second law of electrolysis.
(e) Define oxidation potential with example.
(f) Explain following statement with example All minerals are not ore but all ores are minerals.
(g) Why woods metal is used in electric fuses ?
(h) What is binary alloy ? Give two examples.
(i) Write two applications of cork or asbestos.
(j) Define pollution and pollutant.
(k) The CO is colourless, odourless gas, even though it is pollutant. Why ?
(1) State two effects of water pollution on soil.
12002 [2]
2. Attempt any FOUR of the following : 16
(a) State four points of distinction between orbit and orbital.
(b) Compare proton, neutron, electron with respect to their mass, charge, location. Define atom.
(c) Explain the formation of calcium chloride molecule with schematic representation. Name the type of bonding in calcium chloride molecule.
39 52 40 35
(d) Write orbital electronic configuration of K, Cr, Ar, Cl.
6 19 24 18 17
(e) State four properties of isotopes and isobars.
(f) Explain the mechanism of electrolysis of aqueous sodium chloride with using carbon electrodes.
3. Attempt any FOUR of the following : 16
(a) Explain four factors affecting degree of ionisation.
(b) A solution of bivalent metal salt was electrolysed for 5 minutes with a current of 3 ampere. The weight metal deposited was 0.685 g. What is the atomic weight of metal ?
(c) State four postulates of Arrhenius theory of ionisation. *
(d) Explain working of lead acid storage cell during Discharging mode with the help of diagram and chemical reactions.
(e) Explain the electrorefining of copper with the help of figure.
(f) Write two applications of Cromium and Tungsten based on two different properties.
12M2 [3]
4. Attempt any F#UR f the following : 16
(a) Define the terms malleability, castability, flux, slag.
(b) Write composition of Babbit metal. State its two properties and two uses.
(c) How carbonate ore is concentrated by using chemical method ?
(d) Explain the process used for removal of impurities from Tinstone ore.
(e) Write four applications and four properties of thermocole.
(f) Explain the four purposes of making alloy with suitable one example for each purpose.
5. Attempt any FOUR of the following : 16
(a) Explain the formation of Bakelite plastic by condensation polymerisation.
(b) Define:
(i) Elasticity
(ii) Tackiness
(iii) Abrasion resistance
(iv) Stress-strain property
(c) State the causes and effects of the four gaseous pollutants in brief.
(d) Explain the four causes of water pollution.
(e) What is compounding of plastics ? Name any three constituents added during compounding of plastic. Give one use of each of them.
(f) Name and explain the process used to increase the stiffness of rubber with chemical reaction.
12002 [4]
6. Attempt any FOUR of the following : 16
(a) How glass wool is prepared ? Give its two applications based on two different properties.
(b) Explain in brief two methods to control air pollution.
(c) What is BOD ? Write its significance in water pollution.
(d) Write control methods of water pollution.
(e) What is preventive environmental management ? State its six objectives.
(f) Explain causes and effects of Biomedical waste.
|
Attachment: |
| Earning: Approval pending. |
