SINGHANIA UNIVERSITY BSC AIRCRAFT MAINTENANCE ENGINEERING VI SEM MODEL QUESTION PAPER
Subject: CHEMISTRY Paper Code: CHE-103
M.M- 100 TIME-2Hrs.
Attempt all questions. Questions of PART A carry One mark each Questions of PART B carry Ten marks each
PART A
1. When the temperature is increased, surface tension of water a. Increases b. Decreases c. Remains Constant d. Shows irregular behavior 2. NO(g) + O 2(g) 2NO2(g) order of reaction is a. 4 b. 2 c. 3 3. Molecular formula of formaldehyde a.CH3 Co CH3 b. HCHO d.1
(b) (c)
(b) c. CH3 CHo d. C2H5OH (a)
4. Which of the following is man-made source of air pollution a) Automobile Exhaust b) Forest fire c) Bacterial action in soil and swamp areas d) All the above 5. Harmful chemical present in tobacco is a) Nicotine b) Atropine 6. A fertile soil is likely to have a PH of a) 3 b) 9 c) 6-7 7. Isomer of ethanoic acid is a) Methyl methanol b) Methyl ethanol 8. Which set of quantum numbers are wrong? a) n = 2, l = 1, m=o, S= + c) n = 3, l = 2, m=o, S= + 9. A p-orbital can accommodate a) 4 Electrons b) 6 Electrons c) Tannic Acid d) 14 d) Morphine
(a) (c) (a) c) Ethyl Ethanol d) butyl Ethanol (a) b) n = 2, l = 2, m=o, S= + d) n = 3, l = 2, m=o, S= + (b) c) 8 Electrons d) 3 Electrons (b)
10. In Daniall cell the changes that take place at copper electrode and zinc Electrode respectively a) Oxidation, Reduction b) Reduction, Oxidation c) Oxidation, Oxidation d) Reduction, Reduction
11. The product of pressure and volume ( PV ) has a unit of a. impulse b. energy or work c. entropy d. force 12. What is the value of Plancks constant a. 6.626 x 10-34 J-s b. 6.2 x 10-34 cal
(b )
(a) c. 6.625 x 1027 cal d. All (b) ( b) d) mostely (a) d) All the above (c) d) G=
13. Which of the following is present in maximum amount in acid rain a) HNO3 b) H2SO4 c) HCl d) H2CO3 14. Magnetic quantum number was proposed by a) Bohr b) Lande c) Sommer field 15. Enthalpy is for endothermic reaction a) H = +Ve b) H = -Ve 17. The reaction is at equilibrium a) G> 0 b) G<0 c) H = O
c) G = 0
18. The rate of reaction (d) a) Decreases with time b) Decreases with decrease in concentration of reactant c) Increases with increase of temperature d) All the above 19. What is the molecular formula for 1 Hexanol a) C6 H13OH b) C5H12OH c) C4 H8OH 20. According to Lewis concept, acid is a) Electron Pair donor b) Proton donor (a) d) C7H14OH (b) d) Electron Pair acceptor (a)
b) Proton acceptor
21. Mass of neutron is ------ times of the mass of electron a)1840 b) 1480 c) 200 d) None of the above 22. Positive rays were discovered by a) Thomson b) Aston c) Gold Stain d) Bragg 23. What is the functional group in aldehydes a) R-OH b) R-CO-R
(a)
(c) c) R-CHO d) R-O-R (b)
24. Ter-molecular reaction steps require______ coming together at the same time a) Ter molecules b) Three molecules c) Two molecules d) None 25. The frequency of spectrum of micro wave region used for radar is: a) 106 Hz b) 1010 Hz c) 1012 Hz d) 1013 Hz 26. Statement A: The spectrum of radiation emitted by a substance that has absorbed energy is called Emission Spectrum Statement B: As in A but called as absorption spectrum a) Both Statements are true b) Only Statement A is true c) Only Statement B is true d) Both Statements are false
(b)
(b)
27. The unit of electro chemical equivalent is a. gram b. gram / ampere c. gram / coulomb 28. Electronic configuration of Aluminum (Al) a) 1s2 2s2 2p6 3s2 b) 1s2 2s2 2p6 3s2 3p1
(c) d. coulomb / gram (b) d) 1s2 2s2 2p6
c) 1s2 2s2 2p6 3s1
29. The spectra of atoms in gas phase which emit light only at specific wave length with (d) dark spaces between them are called a) Atomic spectra b) Line Spectra c) Electron Spectra d) Either a or b 30. The molecularity of a reaction describes what happens on the molecular level (c) where as the order of reaction describes what happens on ____ a) Atomic scale b) Electroscopic Scale c) Macroscopic scale d) Instrument scale
PART B
1. Define the following terms: a) Law of conservation of matter (or mass) b) Atomic Number and Mass Number 2. Explain Reactions of Acids and Bases in Water with an example each. Also define the term amphiprotic 3. Write the structural formula of following substances a) Halogen group b) Carboxyl group c) Nitrile 4. Define Faradays second law of Electrolysis and Derive the equation E = Q x V 5. Write two examples each for Reactions of Atmospheric Nitrogen and Atmospheric Carbon dioxide 6. Explain about Major Sources of Air Pollution (in not more than 75 words) 7. What is a chain reaction? Write the five steps that are involved in Postulated Mechanism which gives the Rate Law
