MCQOPTIONS
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MCQOPTIONS
This section includes 84 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
IUPAC name of \[C{{H}_{3}}-\underset{N{{H}_{2}}\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{3}}\] is [MH CET 2004] |
| A. | Dimethyl amine |
| B. | 2-aminopropane |
| C. | Isopropylamine |
| D. | 2-propanamine |
| Answer» C. Isopropylamine | |
| 52. |
Dumas method involves the determination of nitrogen content in the organic compound in the form of [BHU 2005] |
| A. | NH3 |
| B. | N2 |
| C. | NaCN |
| D. | (NH4)2SO4 |
| Answer» C. NaCN | |
| 53. |
A mixture of camphor and benzoic acid can be separated by [BHU 2005] |
| A. | Chemical method |
| B. | Sublimation |
| C. | Fractional distillation |
| D. | Extraction with a solvent |
| Answer» B. Sublimation | |
| 54. |
How will you separate a solution (miscible) of benzene \[+CHC{{l}_{3}}\] [AFMC 2005] |
| A. | Sublimation |
| B. | Filtration |
| C. | Distillation |
| D. | Crystallisation |
| Answer» D. Crystallisation | |
| 55. |
Which kind of fission is favoured by sunlight [CPMT 2004] |
| A. | Heterolytic fission |
| B. | Homolytic fission |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 56. |
Quantitative measurement of nitrogen in an organic compounds is done by the method [CPMT2004] |
| A. | Berthelot method |
| B. | Belstein method |
| C. | Lassaigne test |
| D. | Kjheldahl's method |
| Answer» E. | |
| 57. |
The latest technique for the purification of organic compounds is [Pb. CET 2001] |
| A. | Fractional distillation |
| B. | Chromatography |
| C. | Vacuum distillation |
| D. | Crystallisation |
| Answer» C. Vacuum distillation | |
| 58. |
Nitrating mixture is [MHCET 2004] |
| A. | Fuming nitric acid |
| B. | Mixture of conc. \[{{H}_{2}}S{{O}_{4}}\] and conc. \[HN{{O}_{3}}\] |
| C. | Mixture of nitric acid and anhydrous zinc chloride |
| D. | None of these |
| Answer» C. Mixture of nitric acid and anhydrous zinc chloride | |
| 59. |
Which of the following compounds is used as a refrigerants [Bihar CEE 1995] |
| A. | \[N{{H}_{3}}\] |
| B. | \[C{{H}_{2}}{{F}_{2}}\] |
| C. | \[CC{{l}_{4}}\] |
| D. | \[C{{H}_{3}}COON{{H}_{4}}\] |
| Answer» B. \[C{{H}_{2}}{{F}_{2}}\] | |
| 60. |
The decomposition of organic compounds in the presence of oxygen and without formation of odoriferous substances, is called [CBSE PMT 1999] |
| A. | Decay |
| B. | \[{{N}_{2}}\] fixation |
| C. | Nitrification |
| D. | Denitrification |
| Answer» B. \[{{N}_{2}}\] fixation | |
| 61. |
Which one of the following reagents is used for detection of unsaturation in alkenes [EAMCET 2003] |
| A. | \[NaOH+CaO\] |
| B. | Cold dilute alkaline \[KMn{{O}_{4}}\] |
| C. | \[C{{l}_{2}}/hv\] |
| D. | \[KOH/{{C}_{2}}{{H}_{5}}OH\] |
| Answer» C. \[C{{l}_{2}}/hv\] | |
| 62. |
If we want to study relative arrangement of atoms in a molecule we study [Orissa JEE 2003] |
| A. | Empirical formula |
| B. | Molecular formula |
| C. | Structural formula |
| D. | None of these |
| Answer» D. None of these | |
| 63. |
In Victor Mayer?s method 0.2 gm of an organic substance displaced 56 ml of air at STP the molecular weight of the compound [Kerala (Med.) 2003] |
| A. | 56 |
| B. | 112 |
| C. | 80 |
| D. | 28 |
| Answer» D. 28 | |
| 64. |
Chromatography is used for the purification of [KCET 2002] |
| A. | Solids |
| B. | liquids |
| C. | Gases |
| D. | All of these |
| Answer» E. | |
| 65. |
To differentiate between carbon-12, carbon-13 and carbon-14, the instrument that you would use in [Kerala (Engg.) 2002] |
| A. | Infra-red spectrometer |
| B. | Atomic absorption spectrometer |
| C. | Mass spectrometer |
| D. | Ultraviolet spectrometer |
| Answer» D. Ultraviolet spectrometer | |
| 66. |
Chromatography is a valuable method for the separation, isolation, purification and identification of the constituents of a mixture and it is based on general principle of[Kerala (Med.) 2002] |
| A. | Phase rule |
| B. | Phase distribution |
| C. | Interphase separation |
| D. | Phase operation |
| Answer» B. Phase distribution | |
| 67. |
In kjeldahl?s method, \[CuS{{O}_{4}}\] acts as [AFMC 2001] |
| A. | Oxidising agent |
| B. | Reducing agent |
| C. | Hydrolysing agent |
| D. | Catalytic agent |
| Answer» E. | |
| 68. |
0.2595g of an organic substance in a quantitative analysis yielded 0.35 g of the barium sulphate. The percentage of sulphur in the substance is[CPMT 2000; AFMC 2001; Pb. CET 2000] |
| A. | 18.52g |
| B. | 182.2 g |
| C. | 17. 5 g |
| D. | 175.2g |
| Answer» B. 182.2 g | |
| 69. |
An organic compound has % of C and % of H in the ratio 6 : 1 and % of C and % of O in the ratio 3 : 4. The compound is [Roorkee 1999] |
| A. | \[HCHO\] |
| B. | \[C{{H}_{3}}OH\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| D. | \[{{H}_{2}}\to {{H}^{\bullet }}+{{H}^{\bullet }}\] |
| Answer» B. \[C{{H}_{3}}OH\] | |
| 70. |
The vapour density of the methyl ester of an organic monocarboxylic acid is 37. What is the molecular weight of the acid |
| A. | 46 |
| B. | 60 |
| C. | 70 |
| D. | 74 |
| Answer» E. | |
| 71. |
64 gm of an organic compound contains 24 gm of carbon, 8 gm of hydrogen and the rest oxygen. The empirical formula of the compound is [MP PMT 1996] |
| A. | \[C{{H}_{2}}O\] |
| B. | \[{{C}_{2}}{{H}_{4}}O\] |
| C. | \[C{{H}_{4}}O\] |
| D. | \[{{C}_{2}}{{H}_{8}}{{O}_{2}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{8}}{{O}_{2}}\] | |
| 72. |
An organic compound contains C, H and O in the proportion of 6 : 1 : 8 by weight, respectively. Its vapour density is 30. Its molecular formula will be |
| A. | \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\] |
| B. | \[C{{H}_{4}}O\] |
| C. | \[C{{H}_{2}}O\] |
| D. | \[{{C}_{3}}HO\] |
| Answer» B. \[C{{H}_{4}}O\] | |
| 73. |
An organic compound gave the following results \[C=53.3%,\text{ }H=15.6,\text{ }N=31.1%,\] mol. wt. = 45, What is molecular formula of the compound? |
| A. | \[{{C}_{2}}{{H}_{5}}{{N}_{2}}\] |
| B. | \[{{C}_{2}}{{H}_{5}}N\] |
| C. | \[{{C}_{2}}{{H}_{7}}N\] |
| D. | \[{{C}_{2}}{{H}_{6}}N\] |
| Answer» D. \[{{C}_{2}}{{H}_{6}}N\] | |
| 74. |
An organic compound gave C = 92.31% and \[H=7.69%\]. If molecular weight of the compound is 78, its molecular formula is |
| A. | \[{{C}_{6}}{{H}_{6}}\] |
| B. | \[{{C}_{7}}{{H}_{7}}\] |
| C. | \[{{C}_{6}}{{H}_{18}}\] |
| D. | \[{{C}_{8}}{{H}_{20}}\] |
| Answer» B. \[{{C}_{7}}{{H}_{7}}\] | |
| 75. |
An organic compound on analysis gave the following results : C = 54.5%, O = 36.4%, H = 9.1%. The Empirical formula of the compound is [CPMT 1977; KCET 1998; MP PET 2003; UPSEAT 2004; IIT-JEE (Screening) 2004] |
| A. | \[C{{H}_{3}}O\] |
| B. | \[{{C}_{2}}{{H}_{4}}O\] |
| C. | \[{{C}_{3}}{{H}_{4}}O\] |
| D. | \[{{C}_{4}}{{H}_{8}}O\] |
| Answer» C. \[{{C}_{3}}{{H}_{4}}O\] | |
| 76. |
A compound contains \[C=90%\] and \[H=10%\]. Empirical formula of the compound is [NCERT 1976; EAMCET 1978] |
| A. | \[{{C}_{3}}{{H}_{10}}\] |
| B. | \[C{{H}_{2}}\] |
| C. | \[{{C}_{3}}{{H}_{2}}\] |
| D. | \[{{C}_{3}}{{H}_{4}}\] |
| Answer» E. | |
| 77. |
Actual number of atoms of different elements present in a molecule of a compound is given by |
| A. | Molecular formula |
| B. | Structural formula |
| C. | Empirical formula |
| D. | None of these |
| Answer» B. Structural formula | |
| 78. |
Formula which represents a simple ratio of atoms of different elements present in a molecule of the substance is called |
| A. | Molecular formula |
| B. | Empirical formula |
| C. | Structural formula |
| D. | Condensed formula |
| Answer» C. Structural formula | |
| 79. |
In Kjeldahl's method for the estimation of nitrogen, the formula used is |
| A. | \[%N=\frac{1.4\text{ }V\text{ }W}{N}\] |
| B. | \[%N=\frac{1.4\text{ }N\text{ }W}{V}\] |
| C. | \[%N=\frac{V\text{ }N\text{ }W}{1.8}\] |
| D. | \[%N=\frac{1.4\text{ }V\text{ }N}{W}\] |
| Answer» E. | |
| 80. |
An organic compound contains \[C=38.8%,\] \[H=16%\] and \[N=45.2%\]. Empirical formula of the compound is [CPMT 1973, 83] |
| A. | \[C{{H}_{3}}N{{H}_{2}}\] |
| B. | \[C{{H}_{3}}CN\] |
| C. | \[{{C}_{2}}{{H}_{5}}CN\] |
| D. | \[C{{H}_{2}}{{(NH)}_{2}}\] |
| Answer» B. \[C{{H}_{3}}CN\] | |
| 81. |
60 g of a compound on analysis gave \[C=24\text{ }g,\] \[H=4\text{ }g\] and O = 32 g. Its Empirical formula is [CPMT 1971, 81] |
| A. | \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\] |
| B. | \[{{C}_{2}}{{H}_{2}}O\] |
| C. | \[C{{H}_{2}}{{O}_{2}}\] |
| D. | \[C{{H}_{2}}O\] |
| Answer» E. | |
| 82. |
In Carius method 0.099 g organic compound gave 0.287 g \[AgCl\]. The percentage of chlorine in the compound will be |
| A. | 28.6 |
| B. | 71.7 |
| C. | 35.4 |
| D. | 64.2 |
| Answer» C. 35.4 | |
| 83. |
0.24 g of an organic compound gave 0.22 g \[C{{O}_{2}}\] on complete combustion. If it contains 1.66 % hydrogen, then the percentage of C and O will be [MP PET 1986] |
| A. | 12.5 and 36.6 |
| B. | 25 and 75 |
| C. | 25 and 36.6 |
| D. | 25 and 80 |
| Answer» C. 25 and 36.6 | |
| 84. |
In the estimation of sulphur organic compound on treating with conc. \[HN{{O}_{3}}\] is converted to |
| A. | \[S{{O}_{2}}\] |
| B. | \[{{H}_{2}}S\] |
| C. | \[{{H}_{2}}S{{O}_{4}}\] |
| D. | \[S{{O}_{3}}\] |
| Answer» D. \[S{{O}_{3}}\] | |