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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 9601. |
Iodine is formed when KI reacts with a solution of [Pb. CET 2004] |
| A. | \[CuS{{O}_{4}}\] |
| B. | \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] |
| C. | \[ZnS{{O}_{4}}\] |
| D. | \[FeS{{O}_{4}}\] |
| Answer» B. \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] | |
| 9602. |
Butter is a colloid. It is formed when [MNR 1982; MP PET 1991; MP PMT 1994; CPMT 2002] |
| A. | Fat is dispersed in solid casein |
| B. | Fat globules are dispersed in water |
| C. | Water is dispersed in fat |
| D. | Casein is suspended in \[{{H}_{2}}O\] |
| Answer» D. Casein is suspended in \[{{H}_{2}}O\] | |
| 9603. |
n-propyl bromide on treatment with ethanolic potassium hydroxide produces [IIT-JEE 1987; MP PMT 1997] |
| A. | Propane |
| B. | Propene |
| C. | Propyne |
| D. | Propanol |
| Answer» C. Propyne | |
| 9604. |
At low temperatures, the slow addition of molecular bromine to \[C{{H}_{2}}=CH-C{{H}_{2}}-C\equiv CH\] gives [Roorkee Qualifying 1998] |
| A. | \[C{{H}_{2}}=CH-C{{H}_{2}}-CBr=CHBr\] |
| B. | \[BrC{{H}_{2}}-CHBr-C{{H}_{2}}-C\equiv CH\] |
| C. | \[C{{H}_{2}}=CH-C{{H}_{2}}-C{{H}_{2}}-CB{{r}_{3}}\] |
| D. | \[C{{H}_{3}}-CB{{r}_{2}}-C{{H}_{2}}-C\equiv CH\] |
| Answer» B. \[BrC{{H}_{2}}-CHBr-C{{H}_{2}}-C\equiv CH\] | |
| 9605. |
The sugar present in fruits is [KCET 1984] |
| A. | Fructose |
| B. | Glucose |
| C. | Sucrose |
| D. | Galactose |
| Answer» B. Glucose | |
| 9606. |
The process of heat-softening, moulding and cooling to rigidness' can be repeated for which plastics |
| A. | Thermoplastics |
| B. | Thermosetting plastics |
| C. | Both A and B |
| D. | None of the above |
| Answer» B. Thermosetting plastics | |
| 9607. |
Calamine is a mineral, which is [MP PMT 2003] |
| A. | \[ZnC{{O}_{3}}\] |
| B. | \[ZnS\] |
| C. | \[ZnS{{O}_{4}}\] |
| D. | \[ZnO\] |
| Answer» B. \[ZnS\] | |
| 9608. |
Ethyl bromide gives ethylene when reacted with [CPMT 1982, 93; RPET 2000; Pb. PMT 2001] |
| A. | Ethyl alcohol |
| B. | Dilute \[{{H}_{2}}S{{O}_{4}}\] |
| C. | Aqueous KOH |
| D. | Alcoholic KOH |
| Answer» E. | |
| 9609. |
Which one of the following is a linear polymer [KCET 1998] |
| A. | Amylopectin |
| B. | Glycogen |
| C. | Starch |
| D. | Amylose |
| Answer» E. | |
| 9610. |
The saturated solution of \[A{{g}_{2}}S{{O}_{4}}\] is \[2.5\times {{10}^{-2}}\,M.\] Its solubility product \[({{K}_{sp}})\] is [NCERT 1980] |
| A. | \[62.5\times {{10}^{-6}}\] |
| B. | \[6.25\times {{10}^{-4}}\] |
| C. | \[15.625\times {{10}^{-6}}\] |
| D. | \[3.125\times {{10}^{-6}}\] |
| Answer» B. \[6.25\times {{10}^{-4}}\] | |
| 9611. |
In the metallurgy of zinc, the zinc dust obtained from roasting and reduction of zinc sulphide contains some ZnO. How is this removed [MP PET 1993; AFMC 2002] |
| A. | Absorbance of ultraviolet light and re-emission of white light is employed |
| B. | Shock cooling by contact with a shower of molten lead is done |
| C. | X-ray method is used |
| D. | Smelting is employed |
| Answer» E. | |
| 9612. |
Which is the most suitable reagent among the following to distinguish compound (iii) from rest of the compounds (i) \[C{{H}_{3}}-C\equiv C-C{{H}_{3}}\] (ii) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\] (iii) \[C{{H}_{3}}-C{{H}_{2}}-C\equiv CH\] (iv) \[C{{H}_{3}}-CH=C{{H}_{2}}\] [CBSE PMT 1989] |
| A. | Bromine in carbon tetrachloride |
| B. | Bromine in acetic acid |
| C. | Alkaline \[KMn{{O}_{4}}\] |
| D. | Ammoniacal silver nitrate reagent |
| Answer» E. | |
| 9613. |
The Nesseler's reagent contains [CPMT 1976, 88; NCERT 1987; MP PMT 1985; BHU 1996] |
| A. | \[Hg_{2}^{++}\] |
| B. | \[H{{g}^{++}}\] |
| C. | \[Hg{{I}_{2}}^{--}\] |
| D. | \[Hg{{I}_{4}}^{--}\] |
| Answer» E. | |
| 9614. |
Benzene molecule is [MP PET 2001; Pb. PMT 2004] |
| A. | Tetrahedral |
| B. | Planar |
| C. | Pyramidal |
| D. | Trigonal |
| Answer» C. Pyramidal | |
| 9615. |
One mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of \[{{27}^{o}}C\]. If the work done during the process is 3 kJ, the final temperature will be equal to \[({{C}_{v}}=20\,J{{K}^{-1}})\] [KCET 2000; AFMC 2000; AIIMS 2001] |
| A. | 150 K |
| B. | 100 K |
| C. | \[{{26.85}^{o}}C\] |
| D. | 295 K |
| Answer» B. 100 K | |
| 9616. |
Number of \[\pi \] electrons present in naphthalene is [AFMC 1991] |
| A. | 4 |
| B. | 6 |
| C. | 10 |
| D. | 14 |
| Answer» D. 14 | |
| 9617. |
The acid having the highest \[p{{K}_{a}}\] value among the following is [JIPMER 2002] |
| A. | \[HCOOH\] |
| B. | \[C{{H}_{3}}COOH\] |
| C. | \[ClC{{H}_{2}}COOH\] |
| D. | \[FC{{H}_{2}}COOH\] |
| Answer» C. \[ClC{{H}_{2}}COOH\] | |
| 9618. |
Which of the following shows linear structure [CPMT 2003] |
| A. | Ethane |
| B. | Ethene |
| C. | Acetylene |
| D. | \[CC{{l}_{4}}\] |
| Answer» D. \[CC{{l}_{4}}\] | |
| 9619. |
When enthalpy and entropy change for a chemical reaction are \[-2.5\,\times {{10}^{3}}\,cal\] and \[7.4\,cal\] \[{{\deg }^{-1}}\] respectively. Predict the reaction at \[298\,K\] is [AFMC 1998; MH CET 1999; CBSE PMT 2000] |
| A. | Spontaneous |
| B. | Reversible |
| C. | Irreversible |
| D. | Non-spontaneous |
| Answer» B. Reversible | |
| 9620. |
Enzyme activity is maximum at [KCET 1989] |
| A. | 300 K |
| B. | 310 K |
| C. | 320 K |
| D. | 330 K |
| Answer» C. 320 K | |
| 9621. |
Which of the following is true for an adiabatic process [DCE 2002; MP PET 1995, 98, 2004; CPMT 1990; MP PMT 1998, 2002] |
| A. | \[\Delta H=0\] |
| B. | \[\Delta W=0\] |
| C. | \[\Delta Q=0\] |
| D. | \[\Delta V=0\] |
| Answer» D. \[\Delta V=0\] | |
| 9622. |
The species which acts as a Lewis acid but not a Bronsted acid is [MP PMT 1999; Kurukshetra CET 2002] |
| A. | \[NH_{2}^{-}\] |
| B. | \[{{O}^{2-}}\] |
| C. | \[B{{F}_{3}}\] |
| D. | \[O{{H}^{-}}\] |
| Answer» D. \[O{{H}^{-}}\] | |
| 9623. |
To determine the masses of the isotopes of an element which of the following techniques is useful [NCERT 1978; MNR 1979] |
| A. | The acceleration of charged atoms by an electric field and their subsequent deflection by a variable magnetic field |
| B. | The spectroscopic examination of the light emitted by vaporised elements subjected to electric discharge |
| C. | The photographing of the diffraction patterns which arise when X-rays are passed through crystals |
| D. | The bombardment of metal foil with alpha particles |
| Answer» B. The spectroscopic examination of the light emitted by vaporised elements subjected to electric discharge | |
| 9624. |
Which of the following \[C-H\] bond has the lowest bond dissociation energy [CBSE PMT 2000] |
| A. | Primary \[({{1}^{o}})\] \[C-H\] bond |
| B. | Secondary \[({{2}^{o}})\] \[C-H\]bond |
| C. | Tertiary \[({{3}^{o}})\] \[C-H\] bond |
| D. | All of these |
| Answer» D. All of these | |
| 9625. |
Which of the following alkali metal ions has lowest ionic mobility in aqueous solution [KCET 2000] |
| A. | \[R{{b}^{+}}\] |
| B. | \[C{{s}^{+}}\] |
| C. | \[L{{i}^{+}}\] |
| D. | \[N{{a}^{+}}\] |
| Answer» C. \[L{{i}^{+}}\] | |
| 9626. |
Which one of the following statement is true for a electrochemical cell [Pb. PMT 1999; KCET 1999] |
| A. | \[{{H}_{2}}\]is cathode and \[Cu\] is anode |
| B. | \[{{H}_{2}}\] is anode and \[Cu\] is cathode |
| C. | Reduction occurs at \[{{H}_{2}}\]electrode |
| D. | Oxidation occurs at \[Cu\] electrode |
| Answer» C. Reduction occurs at \[{{H}_{2}}\]electrode | |
| 9627. |
A substance X is a compound of an element of group IA the substance X gives a violet colour in flame test, X is [MP PMT 1980, 85, 86; CPMT 1985; DCE 2000] |
| A. | \[LiCl\] |
| B. | \[NaCl\] |
| C. | \[KCl\] |
| D. | None |
| Answer» D. None | |
| 9628. |
Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe [KCET 1998] |
| A. | Glycerol |
| B. | Glycol |
| C. | 1, 2-dibromoethane |
| D. | Benzene |
| Answer» D. Benzene | |
| 9629. |
Heavy water freezes at [UPSEAT 2001] |
| A. | \[0{}^\circ C\] |
| B. | \[3.8{}^\circ C\] |
| C. | \[38{}^\circ C\] |
| D. | \[-\,0.38{}^\circ C\] |
| Answer» C. \[38{}^\circ C\] | |
| 9630. |
The charge of an electron is \[-1.6\times {{10}^{-19}}C.\] The value of free charge on \[L{{i}^{+}}\]ion will be [AFMC 2002; KCET (Engg.) 2002] |
| A. | \[3.6\times {{10}^{-19}}C\] |
| B. | \[1\times {{10}^{-19}}C\] |
| C. | \[1.6\times {{10}^{-19}}C\] |
| D. | \[2.6\times {{10}^{-19}}C\] |
| Answer» D. \[2.6\times {{10}^{-19}}C\] | |
| 9631. |
An organic compound has an empirical formula \[C{{H}_{2}}O\], its vapour density is 45. The molecular formula of the compounds is [DCE 2004] |
| A. | \[C{{H}_{2}}O\] |
| B. | \[{{C}_{2}}{{H}_{5}}O\] |
| C. | \[{{C}_{2}}{{H}_{2}}O\] |
| D. | \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\] |
| Answer» E. | |
| 9632. |
A compound has an empirical formula \[{{C}_{2}}{{H}_{4}}O\]. An independent analysis gave a value of 132.16 for its molecular mass. What is the correct molecular formula [Kerala PMT 2004] |
| A. | \[{{C}_{4}}{{H}_{4}}{{O}_{5}}\] |
| B. | \[{{C}_{10}}{{H}_{12}}\] |
| C. | \[{{C}_{7}}{{O}_{3}}\] |
| D. | \[{{C}_{6}}{{H}_{12}}{{O}_{3}}\] |
| E. | \[{{C}_{4}}{{H}_{8}}{{O}_{5}}\] |
| Answer» E. \[{{C}_{4}}{{H}_{8}}{{O}_{5}}\] | |
| 9633. |
The best method for the separation of naphthalene and benzoic acid from their mixture is [CBSE PMT 2005] |
| A. | Chromatography |
| B. | Crystallisation |
| C. | Distillation |
| D. | Sublimation |
| Answer» C. Distillation | |
| 9634. |
Sulphur sol contains [UPSEAT 2002] |
| A. | Discrete sulphur atoms |
| B. | Discrete sulphur molecules |
| C. | Large agreegates of sulphur molecules |
| D. | Water dispersed in solid sulphur |
| Answer» D. Water dispersed in solid sulphur | |
| 9635. |
Which of the following can act both as Bronsted acid and Bronsted base [MP PET 1995; MP PET/PMT 1998] |
| A. | \[C{{l}^{-}}\] |
| B. | \[HCO_{3}^{-}\] |
| C. | \[{{H}_{3}}{{O}^{+}}\] |
| D. | \[O{{H}^{-}}\] |
| Answer» C. \[{{H}_{3}}{{O}^{+}}\] | |
| 9636. |
Which is correct IUPAC name of the following compound \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,}{\mathop{CH-}}\,}}\,\underset{C{{H}_{2}}-C{{H}_{3}}\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-\overset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,}}\,}}\,}}\,\] [Orissa JEE 1997] |
| A. | 3-isopropyl-2-methylpentane |
| B. | 3-ethyl-2,4-dimethylpentane |
| C. | 2,4-dimethyl-3-ethylpentane |
| D. | 3-isopropyl-4-methylpentane |
| Answer» C. 2,4-dimethyl-3-ethylpentane | |
| 9637. |
IUPAC name of \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,}{\mathop{\overset{OH}{\mathop{\overset{|\,\,\,\,}{\mathop{C-}}\,}}\,}}\,}}\,C{{H}_{2}}-\underset{C{{H}_{3}}\,}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{3}}\] is [CPMT 1996] |
| A. | 2, 4-dimethyl pentanol-2 |
| B. | 2, 4-dimethyl pentanol-4 |
| C. | 2, 2-dimethyl butanol-2 |
| D. | None of these |
| Answer» B. 2, 4-dimethyl pentanol-4 | |
| 9638. |
Bessemer converter is used in the manufacture of [CPMT 1991] |
| A. | Pig iron |
| B. | Steel |
| C. | Wrought iron |
| D. | Cast iron |
| Answer» C. Wrought iron | |
| 9639. |
Which radioactive carbon has been helpful in understanding the mechanism of photosynthesis in plants |
| A. | \[_{6}{{C}^{14}}\] |
| B. | \[_{6}{{C}^{13}}\] |
| C. | \[_{6}{{C}^{12}}\] |
| D. | \[_{6}{{C}^{15}}\] |
| Answer» B. \[_{6}{{C}^{13}}\] | |
| 9640. |
The entropy changed involved in the conversion of 1 mole of liquid water at 373 K to vapour at the same temperature will be \[[\Delta {{H}_{\text{vap}}}=2.257kJ/gm]\] [MP PET 2002] |
| A. | 0.119 kJ |
| B. | 0.109 kJ |
| C. | 0.129 kJ |
| D. | 0.120 kJ |
| Answer» C. 0.129 kJ | |
| 9641. |
The synthetic polymer which resembles natural rubber is [Bihar MEE 1996; DCE 2004] |
| A. | Neoprene |
| B. | Chloroprene |
| C. | Glyptal |
| D. | Nylon |
| Answer» B. Chloroprene | |
| 9642. |
After losing a number of a and b-particles. \[_{92}{{U}^{238}}\] is changed to \[_{82}P{{b}^{206}}\]. The total number of a-particles lost in this process is [UPSEAT 1999, 2000] |
| A. | 10 |
| B. | 5 |
| C. | 8 |
| D. | 32 |
| Answer» D. 32 | |
| 9643. |
Which of the following is not a state function [DCE 2002] |
| A. | \[\Delta S\] |
| B. | \[\Delta G\] |
| C. | \[\Delta H\] |
| D. | \[\Delta Q\] |
| Answer» E. | |
| 9644. |
A radioactive isotope has a half-life of 10 years. What percentage of the original amount of it remain after 20 years [KCET 2001] |
| A. | 0 |
| B. | 12.5 |
| C. | 8 |
| D. | 25 |
| Answer» E. | |
| 9645. |
An organic compound with C = 40% and H = 6.7% will have the empirical formula [MP PET 1999; JIPMER 2002] |
| A. | \[C{{H}_{2}}\] |
| B. | \[C{{H}_{2}}O\] |
| C. | \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\] |
| Answer» C. \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\] | |
| 9646. |
Empirical formula of a hydrocarbon containing 80% carbon and 20% hydrogen is [MP PET 1997; EAMCET 1998; JIPMER 2002] |
| A. | CH |
| B. | \[C{{H}_{2}}\] |
| C. | \[C{{H}_{3}}\] |
| D. | \[C{{H}_{4}}\] |
| Answer» D. \[C{{H}_{4}}\] | |
| 9647. |
Physical adsorption is inversely proportional to the [AFMC 2000] |
| A. | Volume |
| B. | Concentration |
| C. | Temperature |
| D. | All of these |
| Answer» D. All of these | |
| 9648. |
Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is [CBSE PMT 2004] |
| A. | \[\Delta {{S}_{system}}>0\] only |
| B. | \[\Delta {{S}_{surroundings}}>0\] only |
| C. | \[\Delta {{S}_{system}}+\Delta {{S}_{surroundings}}>0\] |
| D. | \[\Delta {{S}_{system}}-\Delta {{S}_{surroundings}}>0\] |
| Answer» D. \[\Delta {{S}_{system}}-\Delta {{S}_{surroundings}}>0\] | |
| 9649. |
When an electron revolves in a stationary orbit then [MP PET 1994] |
| A. | It absorbs energy |
| B. | It gains kinetic energy |
| C. | It emits radiation |
| D. | Its energy remains constant |
| Answer» E. | |
| 9650. |
A solution of sodium bicarbonate in water turns [NCERT 1971] |
| A. | Phenolphthalein pink |
| B. | Methyl orange yellow |
| C. | Methyl orange red |
| D. | Blue litmus red |
| Answer» D. Blue litmus red | |