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)