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2000 Chemistry
| 1. | Which one of the following defects in the crystals lowers its density? |
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(1) F centres
(2) Interstitial defect (3) Frenkel district (4) Schottky |
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| 2. | By adding 20 ml 0.1 N HCI to 20 ml 0.001 N KOH, the pH of the obtained solution will be |
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(1) 2 (2) 1.3 (3) 0 (4) 7 |
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| 3. | The strongest Bronsted base in the following anion is |
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(1) CIO3-
(2) CIO4- (3) CIO- (4) CIO-2 |
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| 4. | H2 + CI2 ® 2 HCI, DH = 194 kJ. In this reaction heat of formation of HCI in KJ is |
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(1) +194 kJ (2) +97 KJ (3) -97 kJ (4) -194 kJ |
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| 5. | The Nitride ion in lithium nitride is composed of |
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(1) 7 protons + 10 electrons (2) 10 protons + 10 electrons (3) 7 protons + 7 electrons (4) 10 protons + 7 electrons |
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| 6. | Which of the following alkyl halides is used as a methylating agent? |
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(1) C2H5Br (2) C6H5CI (3) CH3I (4) C2H5CI |
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| 7. | Number of molecules in one litre of water is close to |
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(1) 18/22.4 x 1023 (2) 55.5 x 6.023 x 1023 (3) 6.023/23.4 x 1023 (4) 18 x 6.023 x 1023 |
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| 8. | Hydrolytic reaction of fats with caustic soda is known as |
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(1) Acetylation
(2) Carboxylation (3) Esterfication (4) Saponification |
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| 9. | On heating sodium metal in current of dry ammonia, the compound formed is: |
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(1) Sodium amide (2) Sodium azide (3) Sodium nitride (4) Sodium hydride |
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| 10. | Froth floatation process is used for the metallurgy of |
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(1) Chloride Ores (2) Amalgams (3) Oxide Ores (4) Sulphide Ores |
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| 11. | Phenol is heated with pthalic anhydride in pressure of cone. H2SO4. The product gives pink colour with alkali. The product is |
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(1) Phenolphthalein (2) Bakelite (3) Salicylic acid (4) Fluorescein |
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| 12. | The colorific value is maximum in case of |
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(1) Milk (2) Minerals (3) Carbon hydrates (4) Proteins |
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| 13. | Which of the following molecules has the largest root mean square velocity at 250C ? |
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(1) CO2 (2) SO2 (3) H2S (4) NH3 |
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| 14. | Matte contains mainly |
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(1) Cu2S and FeS (2) CuS and Fe2S3 (3) Fe (4) Cu2S |
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| 15. | In the synthesis of ammonia N2(g)+3H2(g) Û 2NH3(g) When 100 ml. of N2 has reacted, the volume of H2 which has also reacted and ammonia produced are |
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(1) 300 ml. H2 and 200 ml
NH3 (2) 300 ml. H2 and 300 ml NH3 (3) 100 ml. H2 and 100 ml NH3 (4) 100 ml. H2 and 200 ml NH3 |
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| 16. | Which of the following contains both covalent and ionic bonds? |
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(1) NH4CI
(2) H2O (3) CCI4 (4) CaCI2 |
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| 17. | NH3 and BF3 form an adduct readily because they form. |
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(1)
A Co-ordinate bond (2) A Hydrogen bond (3) An Ionic bond (4) A Covalent bond |
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| 18. | At 4900C, the equilibrium constant for the synthesis of HI is 50, the value of k for the dissociation of HI will be |
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(1) 20.0 (2) 2.0 (3) 0.2 (4) 0.02 |
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| 19. | Aluminium chloride is a/an |
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(1) Bronsted Lowry acid (2) Arrthenius acid (3) Lewis acid (4) Lewis base |
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| 20. | The limiting radius ratio for tetrahedral shape is |
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(1) 0.225 to 0.414
(2) 0.414 t0 0.732 (3) 0 to 0.155 (4) 0.155 to 0.225 |
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| 21. | In Nessler's reagent the ion present is |
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(1) HgI2- (2) HgI2-4 (3) Hg+ (4) Hg++ |
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| 22. | Bleaching powder loses its power on keeping for a long time because |
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(1) It changes into calcium
hypochlorate (2) It changes into calcium chloride and calcium hydroxide (3) It absorbs moisture (4) It changes into calcium chloride and calcium chlorate |
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| 23. | The fatty acid that shows reducing property is |
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(1) Acetic acid (2) Ethanoic acid (3) Oxalic acid (4) Formic acid |
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| 24. | When ethanal is heated with Fehling's solution it gives a precipitate of |
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(1) CuO (2) Cu2O + CuO (3) Cu (4) Cu2O |
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| 25. | A radioactive isotope having a half life of 3 days was received after 12 days. It was found that there were 3 g of the isotope in the container. The initial weight of the isotope when packed was |
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(1) 36 g (2) 48 g (3) 12 g (4) 24 g |
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| 26. | The number of pi-bonds in CH2 = CH - CH = CH - C = CH is |
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(1) 2 (2) 5 (3) 4 (4) 3 |
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| 27. | Hydrogen bonding is maximum in |
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(1) Ethyl chloride (2) Triethyl amine (3) Ethanol (4) Diethyl ether |
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| 28. | 10 litre solution of a urea contains 240 g urea. The active mass of urea will be |
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(1) 0.04 (2) 0.02 (3) 0.4 (4) 0.2 |
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| 29. | In a face centred cubic cell, an atom at the face contributes to the unit cell |
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(1) 1/4 part (2) 1/8 part (3) 1 part (4) 1/2 part |
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| 30. | Flux is used to |
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(1) remove all impurities from ores (2) reduce metal oxide (3) remove silica (4) remove silica and undesirable metal oxide |
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| 31. | Stainless steel contains |
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(1) Fe + Cr + Cu
(2) Fe + C + Ni (3) Fe + Cr + Ni (4) Fe + Ni + Cu |
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| 32. | The number of unpaired electrons in Fe3+ (Z=26) are |
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(1) 5 (2) 6 (3) 3 (4) 4 |
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| 33. | The brown ring test for NO -2 and NO -3 is due to the formation of complex ion with the formula |
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(1) [Fe(H2O)6]2+ (2) [Fe(NO)(CN)5]2+ (3) [Fe(H2O)5NO]2+ (4) [Fe(H2O)(NO)5]2+ |
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| 34. | For which of the following reactions are the numerical values of Kp and kc the same? |
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(1)
H2(g) + Cl2(g) Û
2HCl (2)H2(g)+I2(s) Û 2HI(g) (3) 2NOCl(g) Û 2NO(g)+Cl2 (4) N2(g)+3H2(g) Û 2NH3(g) |
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| 35. | The name of the product obtained by the addition of HI to propene in presence of peroxide catalyst is |
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(1) propyl iodide (2) 2-iodo propene (3) 2-iodopropane (4) I-iodopropane |
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| 36. | Amino acids usually exist in the form of Zwitter Ions. This means that it consists of |
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(1) The basic group - NH2
and the acidic group -COOH (2) The basic group - NH+3 and the acidic group-CO2 (3) The basic group -CO2- and the acidic group - NH3+ (4) No acidic or basic group |
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| 37. |
In the above reaction X stands for |
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(1) SnCI2 (2) NH+3 CI- (3) NH2 (4) CI |
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| 38. | Helium atom is two times heavier than a hydrogen molecule at 298 K. The average Kinetic energy of Helium is |
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(1) Four times that of a hydrogen
molecule (2) Half that of a hydrogen molecule (3) Two times that of a hydrogen molecule (4) Same as that of a hydrogen molecule |
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| 39. | Which of the following reagents is used to distinguish ethene from ethyne? |
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(1) Bromine is CCI4 (2) ammoniacal Cu2CI2 (3) Bromine water (4) alkaline KMnO4 |
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| 40. | When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is |
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(1) Sulphur dioxide (2) Ammonia (3) Carbon dioxide (4) Carbon monoxide |
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| 41. |
 |
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(1) 3, 4, 4-trimethyl heptane (2) 3, 4, 4-trimerthyl octane (3) 2 butyl, 2 methyl, 3 ethyl butane (4) 2 ethyl 3, 3 dimethyl heptane |
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| 42. | Cuprous ion is colourless while cupric ion is coloured because |
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(1) both have half filled p and d-orbitals (2) cuprous ion has incomplete d-orbital and cupric ion has a complete d-orbital (3) both have unpaired electrons in the d-orbitals (4) cuprous ion has a complete d-orbital and cupric ion has an incomplete d-orbital |
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| 43. | Which of the following alkali metal ions has lowest ionic mobility in aqueous solution? |
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(1) Rb+ (2) Cs+ (3) Li+ (4) Na+ |
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| 44. | The normality of 2.3M H7SO4 solution is |
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(1) 2.3 N (2) 4.6 N (3) 0.46 N (4) 0.23 N |
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| 45. | Which of the following does not reduce Benedict's solution? |
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(1) Sucrose (2) Aldehyde (3) Glucose (4) Fructose |
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| 46. | Which of the following is not used in Friedel-Crafts reaction? |
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(1) phenyl acetanilide (2) Bromobenzene (3) Benzene (4) Chlorobenzene |
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| 47. | A reaction that is of the first order with respect to reactant A has a rate constant 6 min-1. If we start with [A] = 0.5 mol L-1, when would [A] reach the value 0.05 mol-1? |
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(1) 0.384 min (2) 0.15 min (3) 3 min (4) 3.84 min |
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| 48. | For the process dry ice ®CO2(g) |
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(1) DH is
positive while Dp is negative (2) Both D H and D p are negative (3) Both DH and Dp are positive (3) DH is negative while Dp is positive |
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| 49. | Which of the following has lowest percentage of carbon? |
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(1) Steel (2) All have same percentage (3) Cast iron (4) Wrought iron |
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| 50. | The pKa of a certain weak acid is 4.0. What should be the [Salt] to [Acid] ratio if we have to prepare a buffer with pH = 5 using the acid and one of the salts? |
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(1) 10 :1 (2) 1 : 10 (3) 4 : 5 (4) 5 : 4 |
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| 51. | If formaldehyde and KOH are heated we get |
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(1) Methane
(2) Methyl alcohol (3) Ethyl formate (4) Acetylene |
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| 52. | Unpleasant smelling carbylamines are formed by heating alkali and chloroform with |
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(1) Any aliphatic amine (2) Any aromatic amine (3) Any amine (4) Any primary amine |
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| 53. | A certain compound gives negative test with ninhydrin and positive test with Benedict's solution it is |
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(1) An amino acid (2) A monosaccharide (3) A lipid (4) A protein |
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| 54. | Brass is an alloy of |
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(1) AI and Zn (2) Cu and AI (3) Ni and Zn (4) Cu and Zn |
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| 55. | A reaction is A+B Û C+D initially. We start with equal concentration of A and B. At equilibrium we find the moles of c is two times that of A. What is the equilibrium constant of the reaction? |
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(1) 1/4 (2) 1/2 (3) 4 (4) 2 |
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| 56. | Which of the following ions can cause coagulation of proteins? |
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(1) Ag+ (2) Na+ (3) Mg++ (4) Ca++ |
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| 57. | Solution of sodium metal in liquid ammonia is strongly reducing due to the presence in the solution of the following |
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(1) Sodium hydride (2) Sodium amide (3) Sodium atoms (4) Solvated electrons |
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