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1999 Chemistry
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(1) It is slow
(2) It is irreversible (3) It is independent of temperature (4) It is highly specific |
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| 2. | The dissociation constant of an acid HA is 1 x 10-5. The pH of 0.1 molar solution of the acid will be: |
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(1) One
(2) Five (3) Four (4) Three |
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| 3. | Buffer solution can be obtained by mixing aqueous solutions of: |
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(1) NaCI and HCI (2) CH3COONa and CH3COOH (3) CH3COOH and excess NaOH (4) CH3COONa and Excess HCI |
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| 4. | Ammonia gas dissolves in water to form NH4OH. In this reaction water acts as: |
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(1) A base (2) A conjugate base (3) A non-polar solvent (4) An acid |
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| 5. | The number of atoms in one unit cell of a face centred cubic lattice is: |
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(1) 4
(2) 1 (3) 2 (4) 3 |
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| 6. | Precipitation takes place when the product of concentration of ions: |
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(1) exceeds their solubility product (2) is less than their solubility product (3) is negligible (4) equals their solubility product |
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| 7. | Artificial radioactivity was discovered by: |
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(1) Henry Becquerel (2) Irene Curie and Fredrick Joliot (3) J.J. Thomson (4) Rutherford |
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| 8. | In the β-particle emission, the daughter nuclide will be an.....of the parent. |
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(1) Isotope (2) Isotone (3) Isotope or isobar (4) Isobar |
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| 9. | In electro-refining of copper some gold is deposited as: |
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(1) Anode mud (2) Electrolyte (3) Cathode (4) Cathode mud |
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| 10. | Bauxite is concentrated by: |
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(1) Froth floatation process (2) Chemical method (2) Roasting (4) Magnetic separation |
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| 11. | Which is wrongly matched? |
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(1) Monel metal-Cu +Zn + Sn (2) Duralumin - Al + Cu + Mg + Mn (3) Alnico - Fe + Al + Ni + Co (4) German silver -Cu + Zn + Ni |
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| 12. | The co-ordination number of a metal in co-ordination compounds is: |
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(1) same as secondary valency. (2) sum of primary and secondary valencies (3) same as the oxidation number of the central metal atom (4) same as primary valency |
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| 13. | When carbon monoxide is passed over solid caustic soda heated to 2000C, it forms : |
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(1) NaHCO3 (2) H-COONa (3) CH3COONa (4) Na2CO3 |
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| 14. | Which one of the following on oxidation with alkaline permanganate solution yields benzoic acid? |
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(1) Phenol (2) Isopropyl Chloride (3) Benzyl chloride (4) Chlorobenzene |
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| 15. | The final product of the oxidation of ethyl of alcohol is: |
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(1) Acetone
(2) Acetic acid (3) Ethane (4) Acetaldehyde |
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| 16. | Carbolic acid is : |
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(1) Acetic acid (2) Salicylic acid (3) Phenol (4) Formic acid |
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| 17. | Phenol can be converted into salicylic acid by: |
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(1) Reimer-Tiemann reaction (2) Cannizzaro reaction (3) Perkin reaction (4) Etard reaction |
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| 18. | Benzaldehyde is different from aliphatic aldehydes in its reaction towards |
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(1) Tollens reagent (2) NaHSO3 solution (3) Fehling's solution (4) Schiff's reagent |
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| 19. | Acetal formation from an aldehyde and an alcohol is favoured by the presence of |
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(1) Conc. H2SO4 (2) HCN (3) Acetic acid (4) Dry HCI |
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| 20. | A mixture of calcium acetate and calcium acetate benzoate on dry distillation gives: |
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(1) Benzophenone (2) Acetone (3) Benzaldehyde (4) Acetophenone |
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| 21. | Which is the IUPAC name of: |
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(1)
3-chloro-2, 2-diethylpropane (2) I-chloro-2,2-diethyl-2-methylethane (3) I-chloro-2-ethyl-2-methylbutane (4) I-chloro-2,3-diethylopropane |
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| 22. | Which is the compound obtained by heating salicylic acid with phenol in the presence of phosphorus oxychloride? |
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(1) Salol (2) Oil of Wintergreen (3) o-Chlorobenzoyl chloride (4) Aspirin |
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| 23. | The compound used as a preservative for food products such as tomato ketchup and fruit juices is |
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(1) Sodium acetate (2) Sodium benzoate (3) Formic acid (4) Sodium salicylate |
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| 24. | Starting with three different amino acid molecules how many different tripeptide molecules could be formed? |
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(1) 6 (2) 12 (3) 9 (4) 3 |
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| 25. | Amides can be converted into amines by: |
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(1) Carbylamine reaction (2) Sandmeyer reaction (3) Dehydration reaction (4) Hofmann's reaction |
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| 26. | Which of the following tests is not used for testing proteins? |
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(1) Ninhydrin test (2) Millon's test (3) Molisch's test (4) Biuret test |
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| 27. | A distinctive and characteristic functional group of fats is: |
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(1) a peptide group
(2) an ester group (3) an alcoholic group (4) a ketonic group |
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| 28. | Which one is a broad spectrum drug? |
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(1)
Chloramphenicol
(2) Chloroquine (3) chloroxylenol (4) Plasmoquine |
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| 29. | Indigestive carbohydrate which is also a constituent of our diet is: |
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(1) Starch (2) Cellulose (3) Galactose (4) Maltose |
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| 30. | In the precipitation of third group of basic radicals in qualitative analysis, NH4CI is added before adding NH4OH to |
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(1) increase the concentration of CI-
ions (2) increase the concentration of NH4+ ions (3) Keep the pH constant (4) Decrease the concentration of OH- ions |
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| 31. | The catalyst used in Ziegler process for polyethylene manufacture: |
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(1) consists of aluminium triethyl
and titanium tetrachloride (2) consists of aluminium chloride and titanium dioxide (3) is vanadium pentoxide (4) is finely divided nickel. |
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| 32. | For the reaction H2(g) +1/2 O2(g) ®H2 O ( I) DH= -285.8 kJ mol-1; DS =- 0.163 kJ mol-1 k-1 what is the value of free energy change at 270C for the reaction? |
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(1) +334.7 kJ mol-1
(2) -236.9 kJ mol-1 (3) -281.4 kJ mol-1 (4) -334.7 kJ mol-1 |
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| 33. | Amines behave as: |
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(1) Lewis bases (2) Aprotic acids (3) Amphoteric compounds (4) Lewis acids |
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| 34. | An alkane has a C/H ratio (by mass) of 5.1428. Its molecular formula is: |
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(1) C7H16 (2) C5H12 (3) C6H14 (4) C8H18 |
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| 35. | Schotten-Baumann reaction can be used to synthesise an |
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(1) alcohol
(2) ester (3) ether (4) acid |
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| 36. | If two moles of an ideal gas at 546 k occupies a volume of 44.8 litres, the pressure must be: |
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(1) 1 atmosphere
(2) 4 atmospheres (3) 3 atmospheres (4) 2 atmospheres |
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| 37. | At what temperature will the R.M.S. velocity of sulphur dioxide be the same as that of oxygen at 298 k? |
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(1)
273 k (2) 596 k (3) 398 k (4) 298 k |
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| 38. | The number of possible different codons is: |
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(1) 48 (2) 16 (3) 64 (4) 32 |
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| 39. | The molarity of a solution containing 5 g of NaOH in 250 cm3 solution is: |
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(1) 0.5 (2) 0.1 (3) 2 (4) 1 |
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| 40. | The atomic number of an element is 17. The number of orbitals containing electron pairs in the valance shell is: |
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(1) Six (2) Two (3) Eight (4) Three |
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| 41. | The following one isotope is used in cancer therapy, It is |
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(1) Ca-40 (2) Co-60 (3) Na-24 (4) Co-58 |
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| 42. | Fluorine, chlorine, bromine and iodine are placed in the same group (17) of the periodic table, because: |
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(1) they are electronegative (2) they have 7 electrons in the outermost shell of their atom (3) their atoms are generally univalent (4) they are non-metals |
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| 43. | The element with the highest first ionisation energy among the following is: |
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(1) Carbon
(2) Oxygen (3) Nitrogen (4) Boron |
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| 44. | Carbon is benzene molecule is: |
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(1) sp2 hybridised
(2) sp2 hybridised (3) not hybridised (4) sp hybridised |
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| 45. | 10 cm2 solution of H2O2 on decomposition gives 150 cm3 of O2 at S.T.P. The H2O2 has the volume strength: |
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(1) 10 vol. (2) 15 vol (3) 30 vol (4) 20 vol |
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| 46. | H3PO2 is the molecular formula of an oxyacid of phosphorus. Its name and basicity respectively are: |
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(1) Hypophosphorus acid and
one (2) Phosphorous acid and two (3) Hypophosphorus acid and two (4) Metaphosphoric acid and one |
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| 47. | Acetylene reacts with 20% H2SO4 containing 1% HgSO4 to give: |
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(1) HCHO (2) CH2=CH2 (3) C2H5HSO4 (4) CH3CHO |
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| 48. | Benzene hexochloride is a/ an: |
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(1) Catalyst (2) Insecticide (3) Analgesic (4) Antiseptic |
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| 49. | The green house effect is caused by: |
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(1) CO2 (2) NO2 (3) NO (4) CO |
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| 50. | A reagent used to test for unsaturation in alkenes is: |
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(1) Ammoniacal Cu2CI2 (2) Ammoniacal Ag NO2 (3) Solution of Br2 in CCI4 (4) Conc. H2SO4 |
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| 51. | When 50 cm2 of a strong acid is added to 50cm3 of an alkali, the temperature rises by 50C. If 250 cm3 of each liquid are mixed, the temperature rise would be: |
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(1) 200C (2) 50C (3) 100C (4) 250C |
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| 52. | Consider the following reaction in an automobile : 2 C8H18(g) +25 O2 (g) ®16 CO2(g) + 18 H2O(g) |
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(1) -,+,+ (2) +, - + (3) +, +, - (4) -,+,- |
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| 53. | H2(g) +1/2 O2 (g) ® H2O (I); DH298k=-285.8 kJ The molar enthalpy of vapourisation of water at 1 atm and 250C is 44 kJ. The standard enthalpy of formation of 1 mole of water vapour at 250 C is: |
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(1) -329.8 kJ (2) -241.8 kJ (3) 241.8 kJ (4) 329.8 kJ |
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| 54. | 0.6 mole of NH3 in a
reaction vessel of 2 dm3 capacity was brought to equilibrium. The
vessel was then found to contain 0.15 mole of H2 formed by the
reaction. 2NH3(g) Û N2(g)+3H2(g) Which of the following statements is true? |
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(1) The concentration of NH3
at equilibrium is 0.25 mole per dm2 (2) 0.15 mole of the original NH3 had dissociated at equilibrium (3) 0.55 mole of ammonia is left in the vessel (4) At equilibrium the vessel contained 0.45 mole of N2. |
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| 55. | In the reaction H2O/H+ CH3CN + ® A ® B the compound H is |
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(1) ethyl alcohol (2) acetic acid (3) acetone (4) acetaldehyde |
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| 56. | Le Chatelier's principle is applicable only to a: |
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(1) Heterogeneous reaction
(2) System in equilibrium (3) Irreversible reaction (4) Homogeneous reaction |
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| 57. | Which among the following is a false statement? |
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(1) Rate of zero order reaction is
independent of initial concentration of reactant. (2) Half life of a third order reaction is inversely proportional to the square of initial concentration of the reactant. (3) Molecularity of a reaction may be zero of fraction (4) For a first order reaction t1/2= 0.693/k |
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| 58. | For reaction the activation energy Ea = 0 and the rate constant k = 3.2 x 106 s-1 at 300 K . What is the value of the rate constant at 310 K? |
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(1) 6.4 x 106 s-1 (2) 6.4 x 1012 s-1 (3) 3.2 x 106 s-1 (4) 0 |
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| 59. | Certain bimolecular reactions which follow first order kinetics are called: |
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(1) unimolecular reactions (2) first order reactions (3) Pseudo unimolecular reactions (4) bimolecular reactions |
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| 60. | Which one of the following statements regarding catalysts is not true? |
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(1) A catalyst can initiate a
reaction (2) A catalyst does not alter the equilibrium in a reversible reaction (3) Catalysts are sometimes very specific in respect of reaction (4) A catalyst remains unchanged in composition and mass at the end of the reaction |
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