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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.
| 651. |
The molecular mass of acetic acid dissolved in water is 60 and when dissolved in benzene it is 120.This difference in behaviour of \[C{{H}_{3}}COOH\] is because [AMU 2000] |
| A. | Water prevents association of acetic acid |
| B. | Acetic acid does not fully dissolve in water |
| C. | Acetic acid fully dissolves in benzene |
| D. | Acetic acid does not ionize in benzene |
| Answer» C. Acetic acid fully dissolves in benzene | |
| 652. |
Which of the following molecules has one lone pair of electrons on the central atom [EAMCET 1980; AMU 1982; MNR 1989] |
| A. | \[{{H}_{2}}O\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[C{{H}_{4}}\] |
| D. | \[PC{{l}_{5}}\] |
| Answer» C. \[C{{H}_{4}}\] | |
| 653. |
Ge(II)compounds are powerful reducing agents whereas Pb(IV)compounds are strong oxidants. It is because |
| A. | Pb is more electropositive than Ge |
| B. | ionization potential of lead is less than that of Ge |
| C. | ionic radii of \[P{{b}^{2+}}\]and \[P{{b}^{4+}}\] are larger than those of \[G{{e}^{2+}}\] and \[G{{e}^{4+}}\] |
| D. | of more pronounced inert pair effect in lead than in Ge |
| Answer» E. | |
| 654. |
Which of the following set of quantum numbers is possible |
| A. | \[n=3;\,\,l=2;\,\,m=2\] and \[s=+\frac{1}{2}\] |
| B. | \[n=3;\,\,l=4;\,\,m=0\] and \[s=-\frac{1}{2}\] |
| C. | \[n=4;\,l=0;\,\,m=2\] and \[s=+\frac{1}{2}\] |
| D. | \[n=4;\,\,l=4;\,\,m=3\] and \[s=+\frac{1}{2}\] |
| Answer» B. \[n=3;\,\,l=4;\,\,m=0\] and \[s=-\frac{1}{2}\] | |
| 655. |
Which of the following sets of quantum numbers is correct for an electron in \[4f\] orbital |
| A. | \[n=4,\,l=3,\,m=+1,\,s=+\frac{1}{2}\] |
| B. | \[n=4,\,l=4,\,m=-4,\,s=-\frac{1}{2}\] |
| C. | \[n=4,\,l=3,\,m=+4,\,s=+\frac{1}{2}\] |
| D. | \[n=3,\,l=2,\,m=-2,\,s=+\frac{1}{2}\] |
| Answer» B. \[n=4,\,l=4,\,m=-4,\,s=-\frac{1}{2}\] | |
| 656. |
To what extent must a given solution of concentration of 40 mg silver nitrate per ml be diluted to yield a solution of concentration of 16 mg \[AgN{{O}_{3}}\] per ml [NCERT 1977] |
| A. | Each ml must be diluted to 2.5 ml |
| B. | To each ml of solution 2.5 ml of water should be added |
| C. | To 2.5 ml of solution 2 ml of water should be added |
| D. | To 1.5 ml of solution 1.5 ml of water should be added |
| Answer» B. To each ml of solution 2.5 ml of water should be added | |
| 657. |
Washing soap can be prepared by saponification with alkali of the oil [CPMT 1986] |
| A. | Rose oil |
| B. | Paraffin oil |
| C. | Groundnut oil |
| D. | Kerosene |
| Answer» D. Kerosene | |
| 658. |
The volume of a gas decreases from \[500\,cc\] to \[300\,cc\] when a sample of gas is compressed by an average pressure of 0.6 atm. During this process 10 J of heat is liberated. The change in internal energy is [Pb. PMT 2000] |
| A. | ? 2.16 J |
| B. | 12.156 J |
| C. | 2.16 J |
| D. | 101.3 J |
| Answer» D. 101.3 J | |
| 659. |
The energy of a photon is calculated by [Pb. PMT 2000] |
| A. | \[E=h\nu \] |
| B. | \[h=E\nu \] |
| C. | \[h=\frac{E}{\nu }\] |
| D. | \[E=\frac{h}{\nu }\] |
| Answer» B. \[h=E\nu \] | |
| 660. |
When acetic acid and \[{{K}_{4}}Fe{{\left( CN \right)}_{6}}\] is added to a copper salt, a chocolate precipitate is obtained of the compound |
| A. | Copper cyanide |
| B. | Copper ferrocyanide |
| C. | Basic copper sulphate |
| D. | Basic copper cyanide |
| Answer» C. Basic copper sulphate | |
| 661. |
10 mL, of a strong acid solution of \[pH=2.000\] are mixed with 990 mL of another strong acid solution of \[pH=4.000\]. The pH of the resulting solution will be: |
| A. | 4.002 |
| B. | 4.000 |
| C. | 4.200 |
| D. | 3.7 |
| Answer» E. | |
| 662. |
Conjugate base of \[NH_{4}^{+}\] is |
| A. | \[N{{H}_{3}}\] |
| B. | \[NH_{2}^{-}\] |
| C. | \[N{{H}_{4}}OH\] |
| D. | \[C{{l}^{-}}\] |
| Answer» B. \[NH_{2}^{-}\] | |
| 663. |
The correct order of acidic strength is: |
| A. | \[C{{l}_{2}}{{O}_{7}}>S{{O}_{2}}>{{P}_{4}}{{O}_{10}}\] |
| B. | \[C{{O}_{2}}>{{N}_{2}}{{O}_{5}}>S{{O}_{3}}\] |
| C. | \[N{{a}_{2}}O>MgO>A{{l}_{2}}{{O}_{3}}\] |
| D. | \[{{K}_{2}}O>CaO>MgO\] |
| Answer» B. \[C{{O}_{2}}>{{N}_{2}}{{O}_{5}}>S{{O}_{3}}\] | |
| 664. |
Which of the following contains asymmetric centre [CPMT 1996] |
| A. | 2-butene |
| B. | 2, 2-dimethylpropane |
| C. | 2-hexyne |
| D. | Lactic acid |
| Answer» E. | |
| 665. |
Number of isomers of molecular formula \[{{C}_{2}}{{H}_{2}}B{{r}_{2}}\] are [CPMT 1987] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» D. 0 | |
| 666. |
Which of the following compounds may not exist as enantiomers [CPMT 1987] |
| A. | \[C{{H}_{3}}CH(OH)C{{O}_{2}}H\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}CH(C{{H}_{3}})C{{H}_{2}}OH\] |
| C. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}C{{H}_{3}}\] |
| D. | \[{{C}_{6}}{{H}_{5}}CHClC{{H}_{3}}\] |
| Answer» D. \[{{C}_{6}}{{H}_{5}}CHClC{{H}_{3}}\] | |
| 667. |
An electron, a proton and an alpha particle have kinetic energies of 16E, 4E and E respectively. What is the qualitative order of their de-Broglie wavelengths? |
| A. | \[{{\lambda }_{e}}>{{\lambda }_{p}}={{\lambda }_{\alpha }}\] |
| B. | \[{{\lambda }_{p}}={{\lambda }_{\alpha }}={{\lambda }_{e}}\] |
| C. | \[{{\lambda }_{p}}>{{\lambda }_{e}}>{{\lambda }_{\alpha }}\] |
| D. | \[{{\lambda }_{\alpha }}<{{\lambda }_{e}}>{{\lambda }_{p}}\] |
| Answer» B. \[{{\lambda }_{p}}={{\lambda }_{\alpha }}={{\lambda }_{e}}\] | |
| 668. |
On moving down the group gradually increase |
| A. | Oxidising property |
| B. | Electronegativity |
| C. | Acidic property |
| D. | Metallic property |
| Answer» E. | |
| 669. |
An ion which has 18 electrons in the outermost shell is |
| A. | \[{{K}^{+}}\] |
| B. | \[C{{a}^{2+}}\] |
| C. | \[N{{a}^{+}}\] |
| D. | \[C{{u}^{+}}\] |
| Answer» E. | |
| 670. |
Which of the following electronic configurations in the outermost shell is characteristic of alkali metals [Bihar CEE 1992] |
| A. | \[(n-1)\,{{s}^{2}}{{p}^{6}},\,n{{s}^{2}}{{p}^{1}}\] |
| B. | \[(n-1)\,{{s}^{2}}{{p}^{6}}{{d}^{10}},\,n{{s}^{1}}\] |
| C. | \[(n-1)\,{{s}^{2}}{{p}^{6}},\,n{{s}^{1}}\] |
| D. | \[n{{s}^{2}}{{p}^{6}}{{d}^{1}}\] |
| Answer» D. \[n{{s}^{2}}{{p}^{6}}{{d}^{1}}\] | |
| 671. |
Lactic acid shows which type of isomerism [CPMT 1987; MP PMT 1987; BHU 2003] |
| A. | Geometrical isomerism |
| B. | Tautomerism |
| C. | Optical isomerism |
| D. | Metamerism |
| Answer» D. Metamerism | |
| 672. |
The orbital angular momentum for an electron revolving in an orbit is given by \[\sqrt{l(l+1)}\frac{h}{2\pi }\]. This momentum for \[{{d}^{5}},\,{{d}^{6}},\,{{p}^{3}}\] electron will be respectively |
| A. | \[\sqrt{6}\,\frac{h}{2\pi },\,\sqrt{7}\,\frac{h}{2\pi },\,\sqrt{2}\,\frac{h}{2\pi }\] |
| B. | \[0\,\frac{\sqrt{6}h}{2\pi },\,\frac{\sqrt{2}h}{2\pi }\] |
| C. | \[\sqrt{6}\,\frac{h}{2\pi },\,\sqrt{6}\frac{6}{2\pi },\,\sqrt{2}\frac{h}{2\pi }\] |
| D. | \[\sqrt{6}\,\frac{h}{2\pi },\,\sqrt{6}\frac{h}{2\pi },\,\sqrt{3}\frac{h}{2\pi }\] |
| Answer» D. \[\sqrt{6}\,\frac{h}{2\pi },\,\sqrt{6}\frac{h}{2\pi },\,\sqrt{3}\frac{h}{2\pi }\] | |
| 673. |
The correct order of thermal stability of hydroxides is: |
| A. | \[Ba{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Mg{{(OH)}_{2}}\] |
| B. | \[Mg{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Ba{{(OH)}_{2}}\] |
| C. | \[Mg{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ba{{(OH)}_{2}}\] |
| D. | \[Ba{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Mg{{(OH)}_{2}}\] |
| Answer» E. | |
| 674. |
Which of the following about wave function \[\psi \] is not correct? |
| A. | \[\psi \] may be a real valued wave function |
| B. | \[\psi \] may be in some cases be a complex function |
| C. | \[\psi \] has a mathematical significance only |
| D. | \[\psi \] is proportional to the probability of finding an electron |
| Answer» E. | |
| 675. |
Calculate \[\Delta {{H}^{o}}\] for evaporation of \[{{H}_{2}}O(l)\] \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{\,}\,{{H}_{2}}O(l);\Delta H=285.77\,\,kJ\] ?(i) \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{\,}\,{{H}_{2}}O(g);\,\Delta H=241.84\,\,kJ\]?(ii) |
| A. | + 43.93 kJ |
| B. | - 43.93 kJ |
| C. | 527.61 kJ |
| D. | - 527.61 kJ |
| Answer» C. 527.61 kJ | |
| 676. |
The heat of neutralization of four acids A, B, C, D are -13.7, -9.4, - 11.2 and - 12.4 kcal, respectively, when they are neutralized by a common base. The acidic character obeys the order: |
| A. | A > B > C < D |
| B. | A > D > C> B |
| C. | D > C > B > A |
| D. | D > B > C > A |
| Answer» C. D > C > B > A | |
| 677. |
The enthalpies of formation of \[A{{l}_{2}}{{O}_{3}}\] and \[C{{r}_{2}}{{O}_{3}}\] 1596 kJ and - 1134 kJ respectively. \[\Delta H\] for the reaction \[2Al+C{{r}_{2}}{{O}_{3}}\to 2Cr+A{{l}_{2}}{{O}_{3}}\] |
| A. | - 2730 kJ |
| B. | - 462 kJ |
| C. | - 1365 kJ |
| D. | + 2730 kJ |
| Answer» C. - 1365 kJ | |
| 678. |
How many molecules are present in one gram of hydrogen [AIIMS 1982] |
| A. | \[6.02\times {{10}^{23}}\] |
| B. | \[3.01\times {{10}^{23}}\] |
| C. | \[2.5\times {{10}^{23}}\] |
| D. | \[1.5\times {{10}^{23}}\] |
| Answer» C. \[2.5\times {{10}^{23}}\] | |
| 679. |
Three dimensional molecules with cross links are formed in the case of a [KCET 2005] |
| A. | Thermoplastic |
| B. | Thermosetting plastic |
| C. | Both |
| D. | None |
| Answer» C. Both | |
| 680. |
Bond length of ethane (I), ethene (II), acetylene (III), and benzene (IV) follows the order: |
| A. | \[I>II>III>IV\] |
| B. | \[I>II>IV>III\] |
| C. | \[I>IV>II>III\] |
| D. | \[III>IV>II>I\] |
| Answer» D. \[III>IV>II>I\] | |
| 681. |
Amongst the following, the total number of species which does/do not exist is : \[S{{F}_{6}},B{{F}_{6}}^{3-},S{{F}_{4}},O{{F}_{4}},Al{{F}_{6}}^{3-},P{{H}_{5}},PC{{l}_{5}},NC{{l}_{5}},SC{{l}_{6}}\] |
| A. | 9 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 682. |
Most favorable condition for ionic bonding are: |
| A. | low charge on ions, large cations, small anions |
| B. | low charge on ions, large cations, large anions |
| C. | high charge on ions, small cations, large anions |
| D. | high charge on ions, large cations, small anions |
| Answer» B. low charge on ions, large cations, large anions | |
| 683. |
Racemic mixture is formed by mixing two [AIEEE 2002] |
| A. | Isomeric compounds |
| B. | Chiral compounds |
| C. | Meso compounds |
| D. | Optical isomers |
| Answer» C. Meso compounds | |
| 684. |
\[\underset{H}{\overset{{{H}_{3}}C}{\mathop{{}}}}\,>C=CC=C< & {} \\ \,\,\,\,H & {} & C{{H}_{3}} \\ \end{matrix}\]exhibit which isomerism [MP PET 2002] |
| A. | Position isomerism |
| B. | Geometrical isomerism |
| C. | Optical isomerism |
| D. | Functional isomerism |
| Answer» C. Optical isomerism | |
| 685. |
\[BC{{l}_{3}}\] is a planar molecule whereas \[NC{{l}_{3}}\] is pyramidal because |
| A. | \[BC{{l}_{3}}\] has no lone pair of electrons but \[NC{{l}_{3}}\] has a lone pair of electrons. |
| B. | \[B-Cl\] bond is more polar than \[N-Cl\] bond. |
| C. | nitrogen atom is smaller than boron atom. |
| D. | \[N-Cl\] bond is more covalent than \[B-Cl\] bond. |
| Answer» B. \[B-Cl\] bond is more polar than \[N-Cl\] bond. | |
| 686. |
To a piece of charcoal, sulphuric acid is added. Then: |
| A. | there is no reaction |
| B. | water gas is formed |
| C. | \[S{{O}_{2}}\] and \[C{{O}_{2}}\] are evolved |
| D. | CO and \[S{{O}_{2}}\] are evolved |
| Answer» D. CO and \[S{{O}_{2}}\] are evolved | |
| 687. |
The solubility product of \[BaS{{O}_{4}}\] is \[1.3\times {{10}^{-9}}\]. The solubility of this salt in pure water will be [MP PET 2002] |
| A. | \[1.69\times {{10}^{-9}}mol\,litr{{e}^{-1}}\] |
| B. | \[1.69\times {{10}^{-18}}mol\,litr{{e}^{-1}}\] |
| C. | \[3.6\times {{10}^{-18}}mol\,litr{{e}^{-1}}\] |
| D. | \[3.6\times {{10}^{-5}}mol\,litr{{e}^{-1}}\] |
| Answer» E. | |
| 688. |
In the following metals which one has lowest probable interatomic forces [MP PMT 1990] |
| A. | Copper |
| B. | Silver |
| C. | Zinc |
| D. | Mercury |
| Answer» E. | |
| 689. |
Which one of the following removes temporary hardness of water |
| A. | Slaked lime |
| B. | Plaster of Paris |
| C. | Cuprous |
| D. | Hydrolith |
| Answer» B. Plaster of Paris | |
| 690. |
Quartz is a crystalline variety of [Pb. PMT 2000] |
| A. | Silica |
| B. | Sodium silicate |
| C. | Silicon carbide |
| D. | Silicon |
| Answer» B. Sodium silicate | |
| 691. |
The radius of the nucleus is related to the mass number \[A\] by [EAMCET 1998] |
| A. | \[R={{R}_{o}}{{A}^{1/2}}\] |
| B. | \[R={{R}_{o}}A\] |
| C. | \[R={{R}_{o}}{{A}^{2}}\] |
| D. | \[R={{R}_{o}}{{A}^{1/3}}\] |
| Answer» E. | |
| 692. |
Which of the following species would be least likely to act as Lewis base? |
| A. | \[PC{{l}_{3}}\] |
| B. | \[C{{N}^{-}}\] |
| C. | \[SC{{l}_{2}}\] |
| D. | \[{{I}^{+}}\] |
| Answer» E. | |
| 693. |
Which of the following cannot have a conjugate base? |
| A. | \[{{H}_{2}}PO_{2}^{-}\] |
| B. | \[HCO_{3}^{-}\] |
| C. | \[{{H}_{2}}{{O}_{2}}\] |
| D. | \[HSO_{4}^{-}\] |
| Answer» B. \[HCO_{3}^{-}\] | |
| 694. |
If acetic acid is 1.0% ionised in its decinormal solution, then pH of its seminormal solution will be |
| A. | 3.4 |
| B. | 4.8 |
| C. | 1.6 |
| D. | 2.6 |
| Answer» E. | |
| 695. |
The least number of oxyacids are formed by: |
| A. | Chlorine |
| B. | Nitrogen |
| C. | Fluorine |
| D. | Sulphur |
| Answer» D. Sulphur | |
| 696. |
Which of the following halogen acids is least acidic [RPET 2003] |
| A. | HI |
| B. | HCl |
| C. | HF |
| D. | HBr |
| Answer» D. HBr | |
| 697. |
\[{{N}_{0}}/2\] atoms of X(g) are converted into \[{{X}^{+}}(g)\] by energy E. \[{{N}_{0}}/2\] atoms of X(g) are converted into \[{{X}^{-}}(g)\] by energy \[{{E}_{2}}\]. Hence, ionization potential and electron affinity of X(g) are |
| A. | \[\frac{2{{E}_{1}}}{{{N}_{0}}},\frac{2({{E}_{1}}-{{E}_{2}})}{{{N}_{0}}}\] |
| B. | \[\frac{2{{E}_{1}}}{{{N}_{0}}},\frac{2{{E}_{2}}}{{{N}_{0}}}\] |
| C. | \[\frac{({{E}_{1}}-{{E}_{2}})}{{{N}_{0}}},\frac{2{{E}_{2}}}{{{N}_{0}}}\] |
| D. | None is correct |
| Answer» C. \[\frac{({{E}_{1}}-{{E}_{2}})}{{{N}_{0}}},\frac{2{{E}_{2}}}{{{N}_{0}}}\] | |
| 698. |
The number of molecules in 8.96 litre of a gas at \[0{}^\circ C\] and 1 atm. pressure is approximately |
| A. | \[6.023\times {{10}^{23}}\] |
| B. | \[12.04\times {{10}^{23}}\] |
| C. | \[18.06\times {{10}^{23}}\] |
| D. | \[24.08\times {{10}^{22}}\] |
| Answer» E. | |
| 699. |
What is the reagent used for testing fluoride ion in water [EAMCET 2003] |
| A. | Alizarin - S |
| B. | Quinalizarin |
| C. | Phenolphthalein |
| D. | Benzene |
| Answer» B. Quinalizarin | |
| 700. |
The mobility of metal ions in aqueous medium \[(L{{i}^{+}},N{{a}^{+}},{{K}^{+}},R{{b}^{+}})\] in the electric field, follows the order |
| A. | \[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\] |
| B. | \[R{{b}^{+}}>N{{a}^{+}}={{K}^{+}}>L{{i}^{+}}\] |
| C. | \[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<R{{b}^{+}}\] |
| D. | \[N{{a}^{+}}={{K}^{+}}>R{{b}^{+}}>L{{i}^{+}}\] |
| Answer» D. \[N{{a}^{+}}={{K}^{+}}>R{{b}^{+}}>L{{i}^{+}}\] | |