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Chemistry 98

1. The acid which reduces Fehling's solution is :

a) Ethanoic acid.
b) Methanoic acid.
c) Propanoic acid.
d) Butanoic acid.
2. When 0.5g. of sulphur is burnt to SO2 4.6 kj of heat is liberated. What is the enthalpy of formation of sulphur dioxide? (S=32 and O=16)

a) -147.2KJ
b) + 147.2KJ
c) + 294.4KJ
d) - 294.4KJ.
3. Assuming complete ionisation, the pH of 0.1M HCL is 1. The molarity of H2SO4 with the same Ph is:

a) 0.1
b) 0.2
c) 0.05
d) 2.0
4. The double helical structure of DNA was proposed by:

a) Meicher
b) Wastson and Crick
c) Khorana
d) Emil Fischer.
5. Oxygen contains 90% O16 abd 10% O18 Its atomic mass is:

a) 16.2
b) 17.4
c) 17.
d) 16.5.
6. Which of the following is used for inducing sleep ?

a) chloroquine
b) paracetamol
c) barbituric acid derivatives.
d) bithional
7. The colour of the precipitate produced by adding NaOH solution to HgCl2 is :

a) black
b) yellow
c) white
d) brown.
8. Which of the following is used as a catalyst for preparing Grignard reagent ?

a) iodine power
b) iron power
c) manganese dioxide
d) activated charcoal.
9. Acetone and acetophenone can be distinguished by :

a) Tollens test
b) CNP TEST
c) Schiff's regent
d) saturated solution of NaHSO3.
10. When chlorine reacts with ethyl alcohol, it forms:

a) chloroform
b) chloral
c) ethyl chloride
d) carbon tetrachloride.
11. The long form of the periodic table has _______ periods, and _______vertical columns.

a) 6;8
b) 6;18
c) 8;12
d) 7;18
12. In the Fischer - Tropsch synthesis of petrol, _____and _____ are used as the raw materials.

a) CH4;H2
b) H2 ; CO
c) CH3OH;CO
d) CH4;CH3OH.
13. Conversion of CH4 to CH3Cl is an example of ______ reaction .

a) nucleophilic substitution
b) electrophilic substitution
c) Free radical addition
d) Free radical substitution.
14. In benzene, all the six C-C bonds have the same length because of :

a) Isomerism
b) chain isomerism
c) resonance
d) hybridisation.
15. The element used by Rutherford in his famous scattering experiment was :

a) tin
b) gold
c) lead
d) silver
16. Which hydrocarbon is formed by the action of sodium on ethyl bromide?

a) Methane
b) Ethane
c) Butane
d) isobutane.
17. Acetone and acetaldehyde are:

a) functional isomer
b) position-isomers
c) chain isomers
d) not isomers.
18. What is the volume of 0. 1 N HCL required to react completely with 1.0g. of pure calcium carbonate ? (Ca=40, c=12 and O=16)

a) 250 cm3
b) 150 cm3
c) 100 cm3
d) 200 cm3
19. Liebermann's test is answered by :

a) methylamine
b) aniline
c) phenol
d) ethyl benzoate
20. Which of the following compounds does not undergo nucleophilic substitution reaction ?

a) ethyl bromide
b) vinyl chloride
c) isopropyl chloride
d) benzyl chloride.
21. A segment of DNA molecule which codes or specifies for one polypeptide chain is called______?

a) Adenine
b) phosphate group
c) amino acid
d) gene
22. Vanaspathi is prepared by the ___________of vegetable oils.
23. Which one of the following is an extensive property?

a) Molarity
b) molar volume
c) mole fraction
d) number of moles
24. Which of the following is a linear polymer ?

a) glycogen
b) amylopectin
c) amylose
d) starch.
25. When sodium benzenesulphonate is fused with NaOH, followed by cidification with HCl, the product formed is :

a) benzensulphonic acid
b) sodium
c) phenol
d) chlorobenzene
26. When the temperature of an ideal gas is increased from 270C to 9270C, the kinetic energy will be:

a) same
b) eight times
c) four times
d) twice
27. Gibbs free energy G is defined as :

a) G = H - TS
b) G = H + TS
c) G = E + TS
d) G = E - TS
28. The change in entropy of an ideal gas during a reversible isothermal expansion is :

a) Negative
b) Positive
c) Zero
d) infinity
29. An organic compound is found to contain C = 54.5% O = 36.4% and H = 9.1% by mass. Its empirical formula is :

a) C2O
b) CHO2
c) C2H4O
d) C3H4O
30. For the reaction :H2 + CL2 (Sunlight) ® 2HCl taking place on water,the order of reaction is :

a) 2
b) 1
c) 0
d) 3
31. Benzene is unreactive because :

a) It has carbon - carbon single bonds
b) It has double bonds
c) p electrons are delocalised
d) Carbons are sp2 hybridised
32. What is the monomer of polypeptide ?

a) Glucose
b) amino acid
c) nucleotide
d) nucleoside
33. For the reaction A ® B, the rate increases by a factor of 2.25 when the concentration of A is increased by 1.5. What is the order of the reaction ?

a) 0
b) 3
c) 1
d) 2
34. Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug combustion chamber and exhaust pipe

a) glycol
b) glycerol
c) benzene
d) 1,2-dibromoethane
35. The rate constant of a reaction depends on :

a) the temperature of the system
b) the time of reaction
c) the extent of reaction
d) the initial concentration of the reactants
36. If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely into ammonia, the ratio of initial and final volumes at the same temperature and pressure would be :

a) 1:2
b) 2:1
c) 1:3
d) 3:1
37. Man dies in an atmosphere of carbon monoxide because:

a) it combines with oxygen present in the body to form carbon dioxide
b) it increases the blood pressure.
c) it reduces the organic batter of tissues.
d) it combines with haemoglobin of the blood making it incapable of absorbing oxygen
38. India conducted an underground nuclear test at :

a) Narora
b) Tarapura
c) Pushkar
d) Pokhran
39. Which of the following enzymes is not useful in the digestion of proteins ?

a) Pepsin
b) Chymotrypsin
c) Lipase
d) trypsin
40. p-type silicon is formed by adding a minute amount of an element with :

a) three valence electrons
b) five valence electrons
c) four valence electrons
d) six valence electrons
41. In blast furnace, the highest temperature is in :

a) slag zone
b) reduction zone
c) combustion zone
d) fusion zone
42. Silica is added to roasted copper ore during smelting in order to remove:

a) cuprous oxide
b) _cuprous sulphide
c) ferrous sulphide
d) ferrous oxide
43. Which of the following is an anti diabetic drug ?

a) pencillin
b) insulin
c) aspirin
d) chloroquine
44. Dimethyl terephthalate and ethylene glycol react to form :

a) nylon-66
b) nylon-6
c) neoprene
d) dacron
45. The internal energy of a substance:

a) decreases with increase in temperature
b) increases with increase in temperature
c) remains unaffected with change in temperature.
d) can be calculated by the relation
    E = mc2
46. The edge length of the unit cell of NaCl crystal lattice is 552 pm. If the ionic radius of sodium ion is 95 pm., what is the ionic radius of chloride ion ?

a) 368 pm
b) 190 pm
c) 276 pm
d) 181 pm
47. A reagent used to test the presence of Fe+2 ion is :

a) NH4CNS
b) H2S
c) K3Fe(CN)6
d) K4Fe(CN)6.
48. Which of the following is a wrong statement about cast iron ?

a) it contains about 4.5% of carbon
b) it is also called pig iron
c) it contracts on cooling
d) it is corrosion resistant
49. What is the product formed in the following reaction ?

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a) O-hydroxybenzoic acid.
b) p-hydroxybenzoic acid.
c) salicyladehyde.
d) benzaldehyde.
50. Amines behave as :

a) Lewis acids
b) Lewis bases
c) Amphoteric compounds
d) Neutral compounds
51. The half - life period t½ of a radioactive element is N years. The eriod of its complete decay is :

a) 2 N years
b) N2 Years
c) infinity
d) ½ N2 Years
52. Iron pipes laying under acidic soil are often attached to blocks of magnesium for protection form rusting.Magnesium offers protection to iron against Corrosion because it

a) is lighter than iron.
b) is more readily converted into positive ions.
c) prevents air from reaching the surface of iron.
d) form a corrosion-resistant ally with iron.
53. An aqueous solution containing 100grams of dissolved MgSO4 is fed to a crystallizer where 80% of the Dissolved salt crystallises out as MgSO4. 6H2O Crystals. How many grams of the hexahydrate salt Crystals are obtained from the crystalliser?(given Mg=24; S=32; O=16 and H=1).

a) 80.
b) 152.
c) 120.
d) 100.
54. The most efficient agent for the absorption of SO3 is:

a) 80% H2S04.
b) 98% H2S04.
c) 90% H2S04.
d) 20% H2S04.
55. During the electrolysis of fused sodium chloride,the anodic reaction is :

a) Oxidation of sodium ions
b) reduction of sodium ions
c) oxidation of chloride ions
d) reduction of chloride ions
56. If the dispersed phase is liquid and the dispersion medium is solid, the colloid is known as a/an :

a) sol
b) emulsion
c) gel
d) foam
57. Only an aldehyde having ____can undergo the aldol condensation.

a) at least one alpha H atom.
b) at least one beta H atom.
c) no alpha H atom.
d) an aromatic ring.
58. Treatment of benzoic acid with Cl2/FeCl3 will give________ acid.

a) o-chlorobenzoic.
b) p-chlorobenzoic.
c) m-chlorobenzoic.
d) 2,4-dichlorobenzoic.
59. Ribose is an example of a/an:

a) aldopentose.
b) ketohexose.
c) aldohexose.
d) disaccharide.
60. The colour of the flame in borron trifluoride test is :

a) blue.
b) crimson.
c) golden yellow.
d) green