Practice Test

1) In paper charomatography

2) Distillation involves all the following process except

3) There are several criteria of purity of organic compounds. Which is considered to be the best?

4) Absolute alcohol cannot be obtained by simple fractionation of solution of ethanol and water because

5) A mixture of camphor and benzoic acid can be seperated by

6) The most satisfactory method of separating sugars from each other is

7) An organic substance from its aqueous solution can be separated by

8) Which reagent is useful in separating benzoic acid from phenol?

9) Separation of petroleum into its components is mostly done by

10) Simple distillation can be used to separate

11) Turpentine oil can be purified by

12) Raw juice in sugar factories is generally concentrated by

13) A bottle containing two immiscible liquid is given to you. These may be separated by

14) Azeotropes are

15) Some organic compounds are purified by distillation at low pressure because the compounds are

16) Charomatographic techniques of purification can be used for

17) In steam distillation, the vapour pressure of the volatile organic compound is

18) Which method cannot be used for purification of liquids?

19) Silica gel is used for keeping away the moisture because it

20) Generally it is more difficult to purify organic compounds than inorganic compounds because

21) Two substance when separated out on the basis of their extent of adsorption by one material, the phenomenon is known as

22) Liquid which decompose below their normal boiling points can be distilled at lower temperature by

23) Which statement apply best to vacuum distillation?

24) Separation of organic compounds by column chromatography is due to

25) The substance used as an adsorbent in the column chromatography is

26) The best method to separate the mixture of ortho and para nitrophenol (1: 1) is

27) Which one of the following is not used for the purification of solid impurities?

28) Simple distillation is used to separate liquid which differ in their boiling points by

29) Which process is suitable for the purification of aniline?

30) Absolute alcohol is prepared by

31) Which of the following is the scientific method to test the presence of water in a liquid?

32) A mixture contains four solid organic compounds A,B,C and D. On heating only C changes from solid to vapour state. C can be separated from the rest mixture by

33) Steam distillation is used for the extraction of

34) Impure glycerine is purified by

35) Which of the following technique is most suitable for purification of cyclohexanone from a mixture containing benzoic acid, isoamyalcohol, cyclohexane and cyclohexanone?

36) The last technique used for purification of organic compound is

37) Anthracene is purified by

38) In lassaigne's test for N, S and halogens, the organic compound is

39) Positive Beilstein test shows that

40) Sodium extract prepared by using thiourea contains which ion in the solution, mainly responsible for a characteristic test?

41) In Lassaigne's test sodium metal is used because

42) The sodium extract on acidification with acetic acid and then adding lead acetate solution gives black precipitate. The organic compound contains

43) During Lassaigne's test, N and S present in an organic compound changes into

44) Sodium nitroprusside when added to an alkaline solution of sulphide ions produce a

45) In a lassaigne's test for sulphur in the organic compound with sodium nitroprusside solution the purple colour formed is due to

46) In lassaigne's test for nitrogen, the blue colour is due to the formation of

47) Which of the following compounds does not show lassaigne's test for nitrogen?

48) The compound formed in the positive test for nitrogen with Lassaigne solution of an organic compound is

49) In the organic compound phosphorus is estimated as

50) Kjeldahl's method cannot be used for the estimation of nitrogen in

51) Halogens can be estimated by

52) In organic compounds sulphur is estimated as

53) The nitrogen content in the protein can be quantitatively estimated by

54) 0.75 g platinichloride of a monoacidic base on ignition gave 0.245 g platinum. The molecular weight of the base is

55) 0.759 g of a silver salt of a dibasic organic acid on ignition gave 0.463 g metallic formula of hydrocarbon is

56) 1.4 g of hydrocarbon on combustion gave 1.8 g water. The empirical formula of hydrocarbon is

57) A compound (60 g) on analysis given C =24 g, H = 4 g and O = 32 g. Its empirical formula is

58) 0.58 g of hydrocarbon on combustion gave 0.9 g water. The percentage of carbon is about

59) In victor Meyer's method, 0.2 g of an organic substance displaced 56 mL of air at STP.. The molecular mass of the compound is

60) 116 mg of a compound on vaporisation in a victor Meyer's apparatus displaces 44.8 ml of air measured at STP. The molecular mass of the compound is

61) The simplest formula of a compound containing 50% of element X (at. wt. 10) and 50% of element Y (at. wt. 20) is

62) An organic compound containing C = 40%, H = 13.33% and N = 46.67%. Its empirical formula would be

63) An organic compound on analysis gave C = 39.9% H = 6.7% and O = 53.4%. The empirical formula of the compound is

64) In a hydrocarbon, mass ratio of hydrogen and carbon is 1: 3, the empirical formula of hydrocarbon is

65) A dibasic acid containing C, H and O was found to contain C = 26.7% and H = 2.2%. The vapour density of diethyl ester was found to be 73. What is molecular formula of acid?

66) The equivalent weight of an acid is equal to

67) An organic compound containing carbon, hydrogen and oxygen contains 52.2% carbon and 13.04% hydrogen Vapour density of the compound is 23. Its molecular formula will be

68) 0.2 g of an organic compound on complete combustion produce 0.18 g of water, then the percentage of hydrogen in it is

69) Empirical formula of a hydrocarbon containing 80% carbon and 20% hydrogen is

70) If we want to study the relative arrangement of atoms in a molecule, we study

71) In Duma's method, the gas which is collected in Nitrometer is

72) In Kjeldahl's method, the nitrogen present is estimated as

73) Which of the following statement is wrong?

74) An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of the compound is

75) Nitrogen in an organic compound can be estimated by

76) In a compound C,H and N are present in 9:1 : 3.5 by weight. If molecular weight of compound is 108, the molecular formula of compound is

77) The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation was passed in 100 ml of 0.1 M sulphuric acid. The excess of acid required 20 ml of 0.5 M NaOH soluction for complete neutralisation. The organic compound is

78) If two compound have the same empirical formula but different molecular formula, they must have

79) Carbon and hydrogen are estimated by

80) In Kjeldahl's method, the nitrogen present in the organic compound is quantitatively converted into

81) 0.4 g of an organic compound gave 0.188 g of silver bromide by a halogen estimation method. The percentage of bromide in the compound is (At. mass of Ag = 108, Br = 80)