MCQOPTIONS
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MCQOPTIONS
This section includes 82 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What is the symbol for the nucleus remaining after \[_{20}C{{a}^{42}}\] undergoes \[\beta \]-emission [MNR 1987; UPSEAT 2000, 02] |
| A. | \[_{21}C{{a}^{42}}\] |
| B. | \[_{20}S{{c}^{42}}\] |
| C. | \[_{21}S{{c}^{42}}\] |
| D. | \[_{21}S{{c}^{41}}\] |
| Answer» D. \[_{21}S{{c}^{41}}\] | |
| 52. |
An element with atomic number 84 and mass number 218 loses one \[\alpha \]-particle and two \[\beta \]-particles in three successive stages, the resulting element will have [NCERT 1979; CPMT 1990] |
| A. | At. no. 84 and mass number 214 |
| B. | At. no. 82 and mass number 214 |
| C. | At. no. 84 and mass number 218 |
| D. | At. no. 82 and mass number 218 |
| Answer» B. At. no. 82 and mass number 214 | |
| 53. |
Which one of the following notations shows the product incorrectly [MP PET/PMT 1998] |
| A. | \[_{96}^{242}Cm\,(\alpha ,\,2n)\,_{97}^{243}Bk\] |
| B. | \[_{5}^{10}B\,(\alpha ,\,n)\,_{7}^{13}N\] |
| C. | \[_{7}^{14}N\,(n,\,p)\,_{6}^{14}C\] |
| D. | \[_{14}^{28}Si\,(d,\,n)\,_{15}^{29}P\] |
| Answer» B. \[_{5}^{10}B\,(\alpha ,\,n)\,_{7}^{13}N\] | |
| 54. |
Which of the following is true about catalyst [Pb.CET 2000] |
| A. | It initiates reaction |
| B. | It changes equilibrium point |
| C. | It increase average kinetic energy |
| D. | It accelerates the rate of reaction |
| Answer» E. | |
| 55. |
In a reversible reaction, a catalyst used |
| A. | Increases the speed of the forward reaction |
| B. | Decreases the speed of the backward reaction |
| C. | Does not alter the final state of equilibrium |
| D. | Increases the amount of the products formed |
| Answer» D. Increases the amount of the products formed | |
| 56. |
Which requires catalyst [AFMC 1987; MP PET 1999] |
| A. | \[S+{{O}_{2}}\to S{{O}_{2}}\] |
| B. | \[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\] |
| C. | \[C+{{O}_{2}}\to C{{O}_{2}}\] |
| D. | All |
| Answer» C. \[C+{{O}_{2}}\to C{{O}_{2}}\] | |
| 57. |
The transition metal used as a catalyst is [Pb. PMT 2004] |
| A. | Nickel |
| B. | Platinum |
| C. | Cobalt |
| D. | All of these |
| Answer» E. | |
| 58. |
Platinised asbestos helps in the formation of \[S{{O}_{3}}\] form \[S{{O}_{2}}\] and \[{{O}_{2}}\]. But, if even a small amount of \[A{{s}_{2}}{{O}_{3}}\] is present the platinised asbestos does not help in the formation of \[S{{O}_{3}}\]. \[A{{s}_{2}}{{O}_{3}}\] acts here as [MP PMT 1997] |
| A. | A positive catalyst |
| B. | A negative catalyst |
| C. | An auto catalyst |
| D. | A poison |
| Answer» E. | |
| 59. |
A catalyst added to a reaction mixture |
| A. | Increases the equilibrium constant |
| B. | Decreases the equilibrium constant |
| C. | Does not change the equilibrium constant |
| D. | None of these |
| Answer» D. None of these | |
| 60. |
In which of the following processes, platinum is used as a catalyst[NCERT 1978, 79] |
| A. | Oxidation of ammonia to form nitric acid |
| B. | Hardening of oils |
| C. | Production of synthetic rubber |
| D. | Synthesis of methanol |
| Answer» B. Hardening of oils | |
| 61. |
Platinized asbestos is used as a catalyst in the manufacture of \[{{H}_{2}}S{{O}_{4}}\]. It is an example of [CPMT 1975] |
| A. | Heterogeneous catalyst |
| B. | Autocatalyst |
| C. | Homogenous catalyst |
| D. | Induced catalyst |
| Answer» B. Autocatalyst | |
| 62. |
Which one of the following statements is incorrect in the case of heterogeneous catalysis[CPMT 1990] |
| A. | The catalyst lowers the energy of activation |
| B. | The catalyst actually forms a compound with the reactant |
| C. | The surface of the catalyst plays a very important role |
| D. | There is no change in the energy of activation |
| Answer» E. | |
| 63. |
\[\underset{\text{Sucrose}}{\mathop{{{C}_{12}}{{H}_{22}}{{O}_{11}}}}\,+{{H}_{2}}O\xrightarrow{dil.\,{{H}_{2}}S{{O}_{4}}}\underset{\text{Fructose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6\,}}(aq)}}\,+\underset{\text{Glucose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}(aq)}}\,\] In this reaction, dilute \[{{H}_{2}}S{{O}_{4}}\] is called [AFMC 1997] |
| A. | Homogeneous catalysis |
| B. | Homogeneous catalyst |
| C. | Heterogeneous catalysis |
| D. | Heterogeneous catalyst |
| Answer» C. Heterogeneous catalysis | |
| 64. |
The catalyst used in the contact process for manufacturing of sulphuric acid is [MP PMT 1987] |
| A. | Copper |
| B. | Iron/aluminum oxide |
| C. | Vanadium pent oxide |
| D. | Platinized asbestos |
| Answer» D. Platinized asbestos | |
| 65. |
Hydrogen bomb is based on the principle of [AIEEE 2005] |
| A. | Nuclear fission |
| B. | Natural radioactivity |
| C. | Nuclear fusion |
| D. | Artificial radioactivity |
| Answer» D. Artificial radioactivity | |
| 66. |
If radium and chlorine combine to from radium chloride the compound is [Kerala PMT 2004] |
| A. | No longer radioactive |
| B. | Twice as radioactive as radium |
| C. | Half as radioactive as radium |
| D. | As radioactive as radium |
| E. | Thrice as radioactive as radium |
| Answer» E. Thrice as radioactive as radium | |
| 67. |
Artificial transmutation was discovered by [Pb.CET 2003] |
| A. | Pauli |
| B. | Rutherford |
| C. | Soddy |
| D. | Curie |
| Answer» C. Soddy | |
| 68. |
In atomic reactors, graphite is used as a [NCERT 1980; MP PET 1989] |
| A. | Lubricant |
| B. | Moderator to slow down neutrons |
| C. | Fuel |
| D. | Liner of the reactor |
| Answer» C. Fuel | |
| 69. |
The first controlled artificial disintegration of an atomic nucleus was achieved by [BHU 1987] |
| A. | Geiger |
| B. | Wilson |
| C. | Cockcroft |
| D. | Rutherford |
| Answer» E. | |
| 70. |
Radioactive carbon dating was discovered by [MP PET 2001] |
| A. | W.F. Libby |
| B. | G.N. Lewis |
| C. | J. Willard Gibbs |
| D. | W. Nernst |
| Answer» B. G.N. Lewis | |
| 71. |
For the fission reaction \[_{92}{{U}^{235}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{56}}B{{a}^{140}}+{{\,}_{y}}{{E}^{x}}+2{{\,}_{0}}{{n}^{1}}\] The value of \[x\]and \[y\] will be |
| A. | \[x=93\] and \[y=34\] |
| B. | \[x=92\] and \[y=35\] |
| C. | \[x=89\] and \[y=44\] |
| D. | \[x=94\] and \[y=36\] |
| Answer» E. | |
| 72. |
Radioactive iodine is being used to diagnose the disease of [MP PET 1996] |
| A. | Bones |
| B. | Kidneys |
| C. | Blood cancer |
| D. | Thyroid |
| Answer» E. | |
| 73. |
A radio isotope will not emit [KCET 2002] |
| A. | Gamma and alpha rays simultaneously |
| B. | Gamma rays only |
| C. | Alpha and beta rays simultaneously |
| D. | Beta and gamma rays simultaneously |
| Answer» C. Alpha and beta rays simultaneously | |
| 74. |
\[{{C}^{14}}\] is [KCET 2002] |
| A. | A natural radioactive isotope |
| B. | A natural non-radioactive isotope |
| C. | An artificial radioactive isotope |
| D. | An artificial non-radioactive isotope |
| Answer» B. A natural non-radioactive isotope | |
| 75. |
The age of most ancient geological formation is estimated by [NCERT 1981; MP PET/PMT 1988; CBSE 1989; MP PET 1997; MP PMT 2002] |
| A. | Potassium ? Argon method |
| B. | Carbon ? 14 dating method |
| C. | Radium ? Silicon method |
| D. | Uranium ? Lead method |
| Answer» C. Radium ? Silicon method | |
| 76. |
Activated charcoal is used to remove coloring matter from pure substances. It works by [KCET 2005] |
| A. | Oxidation |
| B. | Reduction |
| C. | Bleaching |
| D. | Adsorption |
| Answer» E. | |
| 77. |
Physical adsorption is inversely proportional to the [AFMC 2000] |
| A. | Volume |
| B. | Concentration |
| C. | Temperature |
| D. | All of these |
| Answer» D. All of these | |
| 78. |
Which of the following is not a characteristic of chemisorption [KCET 2003] |
| A. | \[\Delta H\] is of the order of 400 kJ |
| B. | Adsorption is irreversible |
| C. | Adsorption may be multimolecular layer |
| D. | Adsorption is specific |
| Answer» D. Adsorption is specific | |
| 79. |
The adsorption of a gas on a solid surface varies with pressure of the gas in which of the following manner [CPMT 1999] |
| A. | Fast\[\to \]slow \[\to \]independent of the pressure |
| B. | Slow\[\to \]fast \[\to \] independent of the pressure |
| C. | Independent of the pressure \[\to \]fast\[\to \]slow |
| D. | Independent of the pressure \[\to \]slow \[\to \]fast |
| Answer» B. Slow\[\to \]fast \[\to \] independent of the pressure | |
| 80. |
In adsorption of oxalic acid on activated charcoal, the activated charcoal is known as |
| A. | Adsorbent |
| B. | Absorbate |
| C. | Adsorber |
| D. | Absorber |
| Answer» B. Absorbate | |
| 81. |
For the adsorption of a gas on a solid, the plot of log (x/m) versus log P is linear with slope equal to [CBSE PMT 1994] |
| A. | k |
| B. | log k |
| C. | n |
| D. | 1/n |
| Answer» E. | |
| 82. |
The charge on \[A{{s}_{2}}{{S}_{3}}\] sol is due to the adsorbed [MP PMT 1985] |
| A. | \[{{H}^{+}}\] |
| B. | \[O{{H}^{-}}\] |
| C. | \[{{O}^{2-}}\] |
| D. | \[{{S}^{2-}}\] |
| Answer» E. | |