Practice Test


Q1) In paper charomatography Show Answer


Q2) Distillation involves all the following process except Show Answer


Q3) There are several criteria of purity of organic compounds. Which is considered to be the best? Show Answer


Q4) Absolute alcohol cannot be obtained by simple fractionation of solution of ethanol and water because Show Answer


Q5) A mixture of camphor and benzoic acid can be seperated by Show Answer


Q6) The most satisfactory method of separating sugars from each other is Show Answer


Q7) An organic substance from its aqueous solution can be separated by Show Answer


Q8) Which reagent is useful in separating benzoic acid from phenol? Show Answer


Q9) Separation of petroleum into its components is mostly done by Show Answer


Q10) Simple distillation can be used to separate Show Answer


Q11) Turpentine oil can be purified by Show Answer


Q12) Raw juice in sugar factories is generally concentrated by Show Answer


Q13) A bottle containing two immiscible liquid is given to you. These may be separated by Show Answer


Q14) Azeotropes are Show Answer


Q15) Some organic compounds are purified by distillation at low pressure because the compounds are Show Answer


Q16) Charomatographic techniques of purification can be used for Show Answer


Q17) In steam distillation, the vapour pressure of the volatile organic compound is Show Answer


Q18) Which method cannot be used for purification of liquids? Show Answer


Q19) Silica gel is used for keeping away the moisture because it Show Answer


Q20) Generally it is more difficult to purify organic compounds than inorganic compounds because Show Answer


Q21) Two substance when separated out on the basis of their extent of adsorption by one material, the phenomenon is known as Show Answer


Q22) Liquid which decompose below their normal boiling points can be distilled at lower temperature by Show Answer


Q23) Which statement apply best to vacuum distillation? Show Answer


Q24) Separation of organic compounds by column chromatography is due to Show Answer


Q25) The substance used as an adsorbent in the column chromatography is Show Answer


Q26) The best method to separate the mixture of ortho and para nitrophenol (1: 1) is Show Answer


Q27) Which one of the following is not used for the purification of solid impurities? Show Answer


Q28) Simple distillation is used to separate liquid which differ in their boiling points by Show Answer


Q29) Which process is suitable for the purification of aniline? Show Answer


Q30) Absolute alcohol is prepared by Show Answer


Q31) Which of the following is the scientific method to test the presence of water in a liquid? Show Answer


Q32) 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 Show Answer


Q33) Steam distillation is used for the extraction of Show Answer


Q34) Impure glycerine is purified by Show Answer


Q35) Which of the following technique is most suitable for purification of cyclohexanone from a mixture containing benzoic acid, isoamyalcohol, cyclohexane and cyclohexanone? Show Answer


Q36) The last technique used for purification of organic compound is Show Answer


Q37) Anthracene is purified by Show Answer


Q38) In lassaigne's test for N, S and halogens, the organic compound is Show Answer


Q39) Positive Beilstein test shows that Show Answer


Q40) Sodium extract prepared by using thiourea contains which ion in the solution, mainly responsible for a characteristic test? Show Answer


Q41) In Lassaigne's test sodium metal is used because Show Answer


Q42) The sodium extract on acidification with acetic acid and then adding lead acetate solution gives black precipitate. The organic compound contains Show Answer


Q43) During Lassaigne's test, N and S present in an organic compound changes into Show Answer


Q44) Sodium nitroprusside when added to an alkaline solution of sulphide ions produce a Show Answer


Q45) In a lassaigne's test for sulphur in the organic compound with sodium nitroprusside solution the purple colour formed is due to Show Answer


Q46) In lassaigne's test for nitrogen, the blue colour is due to the formation of Show Answer


Q47) Which of the following compounds does not show lassaigne's test for nitrogen? Show Answer


Q48) The compound formed in the positive test for nitrogen with Lassaigne solution of an organic compound is Show Answer


Q49) In the organic compound phosphorus is estimated as Show Answer


Q50) Kjeldahl's method cannot be used for the estimation of nitrogen in Show Answer


Q51) Halogens can be estimated by Show Answer


Q52) In organic compounds sulphur is estimated as Show Answer


Q53) The nitrogen content in the protein can be quantitatively estimated by Show Answer


Q54) 0.75 g platinichloride of a monoacidic base on ignition gave 0.245 g platinum. The molecular weight of the base is Show Answer


Q55) 0.759 g of a silver salt of a dibasic organic acid on ignition gave 0.463 g metallic formula of hydrocarbon is Show Answer


Q56) 1.4 g of hydrocarbon on combustion gave 1.8 g water. The empirical formula of hydrocarbon is Show Answer


Q57) A compound (60 g) on analysis given C =24 g, H = 4 g and O = 32 g. Its empirical formula is Show Answer


Q58) 0.58 g of hydrocarbon on combustion gave 0.9 g water. The percentage of carbon is about Show Answer


Q59) 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 Show Answer


Q60) 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 Show Answer


Q61) The simplest formula of a compound containing 50% of element X (at. wt. 10) and 50% of element Y (at. wt. 20) is Show Answer


Q62) An organic compound containing C = 40%, H = 13.33% and N = 46.67%. Its empirical formula would be Show Answer


Q63) An organic compound on analysis gave C = 39.9% H = 6.7% and O = 53.4%. The empirical formula of the compound is Show Answer


Q64) In a hydrocarbon, mass ratio of hydrogen and carbon is 1: 3, the empirical formula of hydrocarbon is Show Answer


Q65) 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? Show Answer


Q66) The equivalent weight of an acid is equal to Show Answer


Q67) 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 Show Answer


Q68) 0.2 g of an organic compound on complete combustion produce 0.18 g of water, then the percentage of hydrogen in it is Show Answer


Q69) Empirical formula of a hydrocarbon containing 80% carbon and 20% hydrogen is Show Answer


Q70) If we want to study the relative arrangement of atoms in a molecule, we study Show Answer


Q71) In Duma's method, the gas which is collected in Nitrometer is Show Answer


Q72) In Kjeldahl's method, the nitrogen present is estimated as Show Answer


Q73) Which of the following statement is wrong? Show Answer


Q74) An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of the compound is Show Answer


Q75) Nitrogen in an organic compound can be estimated by Show Answer


Q76) 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 Show Answer


Q77) 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 Show Answer


Q78) If two compound have the same empirical formula but different molecular formula, they must have Show Answer


Q79) Carbon and hydrogen are estimated by Show Answer


Q80) In Kjeldahl's method, the nitrogen present in the organic compound is quantitatively converted into Show Answer


Q81) 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) Show Answer