Nalanda Open University 2009 B.Sc Chemistry Final , Bachelor of Science, Part-III (Hons.), -VII - Question Paper
Final Examination, 2009 Bachelor of Science, Part-III Chemistry (Hons.), Paper-VII
Full Marks: 75
Time: 3 Hrs.
NALANDA OPEN UNIVERSITY Final Examination, 2009 Bachelor of Science, Part-Ill Chemistry (Hons.), Paper-VIII
Answer any five questions. Question No.l is Compulsory.
1 .(i) The molecule which is I.R. active is:
(a) HC1 (b) N2 (c) 02 (d) H2
(ii) Number of translational, rotational and vibrational degree of freedom of C02 are respectively:
(a) 3,2,4 (b) 3,4,2 (c) 3,3,3 (d) 4,3,2
(iii) Natural rubber is the polymer of (a) neopren (b) isopren
(c) chloropren (d) butadiene
(iv) Terylene is a polymer of (a) Isoprene (b) butadiene (c) Styrene
(d) Chloroprene
(v) Teflon is a polymer of the monomer:
(a) mono fluorethane (b) diflnoroethane (c) trifluoroethane
(d) tetra fluoroethanc
(vi) Octane number of a fuel can be inereased by:
(a) isomerisation (b) alkylation (c) reforming (d) all of these.
(vii) Knocking sound is produced in the engine when the fuel contains:
(a) Water (b)
Lubricating oil isocarbon atom.
to prevent freezing of petrol as an anti knocking agent
(c) Carbondioxide layer
(c) straight chained hydrocarbon (d)
(viii) Iso-octane is added to petrol:
(a) to precipitate inorganic material (b)
(c) to increase boiling-point (d)
(ix) Earth is protected from UV radiation by:
(a) Ozone layer (b) nibrogen layer
(d) Oxygen layer
(x) Which is not an air pollutant?
(a) S02 (b) CO (c) H2
(d) 03
(xi) Which statement is not correct:
(a) CO is the main air pollutant
(b) All pollutants are not waste
(c) Water is polluted by dissolved oxygen (d) Lichen are pollution indicator
(xii) Which of the following is produced by reaction of U.V.Light?
(a) CO (b) S02 (c) 03 (d) N02
(xiii) Which air pollutant is not released by scooter and cars?
(a) S02 (b) Fly ash (d)
hydrocarbon (d) CO
(xiv) Which of the following is an air polluant?
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(d) 02 (xv) Calcium superphosphate is (a) Phosphatic fertilizer (c) Potash fertilizer 2. Discuss the following term: (a) Chromosphore (c) Hyperchomic Shift. |
(c) CO (b) Nitrogenous fertilizer (d) None (b) Bathochromic Shift |
3. Explain the effect of anharmonicity on the vibrational spectra of diatomic molecules.
4. What type of material is rubber? Mention important difference between natural and synthetic rubber. Write the structure of recurring unit of natural rubber.
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Attachment: |
| Earning: Approval pending. |
