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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.
| 7051. |
The total number of valence electrons in \[4.2\,gm\] of \[N_{3}^{-}\] ion is (\[{{N}_{A}}\] is the Avogadro's number) [CBSE PMT 1994] |
| A. | \[1.6{{N}_{A}}\] |
| B. | \[3.2{{N}_{A}}\] |
| C. | \[2.1{{N}_{A}}\] |
| D. | \[4.2{{N}_{A}}\] |
| Answer» B. \[3.2{{N}_{A}}\] | |
| 7052. |
One litre hard water contains 12.00 mg \[M{{g}^{2+}}\]milli equivalent of washing soda required to remove its hardness is [CBSE PMT 2001] |
| A. | 1 |
| B. | 12.15 |
| C. | \[1\times {{10}^{-3}}\] |
| D. | \[12.15\times {{10}^{-3}}\] |
| Answer» B. 12.15 | |
| 7053. |
The type of hybrid orbitals used by the chlorine atom in \[ClO_{2}^{-}\] is [IIT 1992] |
| A. | \[s{{p}^{3}}\] |
| B. | \[s{{p}^{2}}\] |
| C. | \[sp\] |
| D. | None of these |
| Answer» B. \[s{{p}^{2}}\] | |
| 7054. |
If \[{{C}_{1}},\,{{C}_{2}},\,{{C}_{3}}......\]represent the speeds of \[{{n}_{1}},\,{{n}_{2}},\,{{n}_{3}}.....\] molecules, then the root mean square speed is [IIT 1993] |
| A. | \[{{\left( \frac{{{n}_{1}}C_{1}^{2}+{{n}_{2}}C_{2}^{2}+{{n}_{3}}C_{3}^{2}+.....}{{{n}_{1}}+{{n}_{2}}+{{n}_{3}}+.....} \right)}^{1/2}}\] |
| B. | \[\frac{{{({{n}_{1}}C_{1}^{2}+{{n}_{2}}C_{2}^{2}+{{n}_{3}}C_{3}^{2}+.....)}^{1/2}}}{{{n}_{1}}+{{n}_{2}}+{{n}_{3}}+.....}\] |
| C. | \[\frac{{{({{n}_{1}}C_{1}^{2})}^{1/2}}}{{{n}_{1}}}+\frac{{{({{n}_{2}}C_{2}^{2})}^{1/2}}}{{{n}_{2}}}+\frac{{{({{n}_{3}}C_{3}^{2})}^{1/2}}}{{{n}_{3}}}+......\] |
| D. | \[{{\left[ \frac{{{({{n}_{1}}{{C}_{1}}+{{n}_{2}}{{C}_{2}}+{{n}_{3}}{{C}_{3}}+....)}^{2}}}{({{n}_{1}}+{{n}_{2}}+{{n}_{3}}+....)} \right]}^{1/2}}\] |
| Answer» B. \[\frac{{{({{n}_{1}}C_{1}^{2}+{{n}_{2}}C_{2}^{2}+{{n}_{3}}C_{3}^{2}+.....)}^{1/2}}}{{{n}_{1}}+{{n}_{2}}+{{n}_{3}}+.....}\] | |
| 7055. |
At constant temperature, the equilibrium constant (Kp) for the decomposition reaction \[{{N}_{2}}{{O}_{4}}\]⇌\[2N{{O}_{2}}\] is expressed by\[{{K}_{P}}=\frac{(4{{x}^{2}}P)}{(1-{{x}^{2}})}\], where \[P=\] pressure, \[x=\] extent of decomposition. Which one of the following statements is true [IIT Screening 2001] |
| A. | Kp increases with increase of P |
| B. | Kp increases with increase of x |
| C. | Kp increases with decrease of x |
| D. | Kp remains constant with change in P and x |
| Answer» E. | |
| 7056. |
The dissociation constant of two acids \[H{{A}_{1}}\] and \[H{{A}_{2}}\] are \[3.14\times {{10}^{-4}}\] and \[1.96\times {{10}^{-5}}\] respectively. The relative strength of the acids will be approximately [RPMT 2000] |
| A. | 1 : 4 |
| B. | 4 : 1 |
| C. | 1 : 16 |
| D. | 16 : 1 |
| Answer» C. 1 : 16 | |
| 7057. |
One mole of \[{{N}_{2}}{{H}_{4}}\] loses 10 mol of electrons to form a new compound Y. Assuming that all nitrogen appear in the new compound, what is the oxidation state of \[{{N}_{2}}\]in Y ? (There is no change in the oxidation state of hydrogen) [IIT 1981; Pb. PMT 1998] |
| A. | + 3 |
| B. | -3 |
| C. | - 1 |
| D. | 5 |
| Answer» B. -3 | |
| 7058. |
Mark the oxide which is amphoteric in character [MP PMT 2000] |
| A. | \[C{{O}_{2}}\] |
| B. | \[Si{{O}_{2}}\] |
| C. | \[Sn{{O}_{2}}\] |
| D. | \[Ca{{O}_{{}}}\] |
| Answer» D. \[Ca{{O}_{{}}}\] | |
| 7059. |
Increasing order of electronegativity is [RPET 2003] |
| A. | \[Bi<P<S<Cl\] |
| B. | \[P<Bi<S<Cl\] |
| C. | \[S<Bi<P<Cl\] |
| D. | \[Cl<S<Bi<P\] |
| Answer» B. \[P<Bi<S<Cl\] | |
| 7060. |
Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species [CBSE PMT 2005] |
| A. | \[Cl<F<S<O\] |
| B. | \[O<S<F<Cl\] |
| C. | \[S<O<Cl<F\] |
| D. | \[F<Cl<O<S\] |
| Answer» C. \[S<O<Cl<F\] | |
| 7061. |
\[KMn{{O}_{4}}\] reacts with ferrous sulphate according to the equation \[MnO_{4}^{-}+5F{{e}^{2+}}+8{{H}^{+}}\to M{{n}^{2+}}+5F{{e}^{3+}}+4{{H}_{2}}O\] Here \[10ml\] of \[0.1M\] \[KMn{{O}_{4}}\] is equivalent to [CPMT 1999] |
| A. | \[20ml\] of \[0.1M\] \[FeS{{O}_{4}}\] |
| B. | \[30ml\] of \[0.1M\] \[FeS{{O}_{4}}\] |
| C. | \[40ml\] of \[0.1M\] \[FeS{{O}_{4}}\] |
| D. | \[50ml\] of \[0.1M\] \[FeS{{O}_{4}}\] |
| Answer» E. | |
| 7062. |
Arrange \[C{{e}^{+3}},L{{a}^{+3}},P{{m}^{+3}}\] and \[Y{{b}^{+3}}\] in increasing order of their ionic radii [AIEEE 2002] |
| A. | \[Y{{b}^{+3}}<P{{m}^{+3}}<C{{e}^{+3}}<L{{a}^{+3}}\] |
| B. | \[C{{e}^{+3}}<Y{{b}^{+3}}<P{{m}^{+3}}<L{{a}^{+3}}\] |
| C. | \[Y{{b}^{+3}}<P{{m}^{+3}}<L{{a}^{+3}}<C{{e}^{+3}}\] |
| D. | \[P{{m}^{+3}}<L{{a}^{+3}}<C{{e}^{+3}}<Y{{b}^{+3}}\] |
| Answer» B. \[C{{e}^{+3}}<Y{{b}^{+3}}<P{{m}^{+3}}<L{{a}^{+3}}\] | |
| 7063. |
Chloride of which of the following element is coloured [MP PMT 1990] |
| A. | \[Ag\] |
| B. | \[Hg\] |
| C. | \[Zn\] |
| D. | \[Co\] |
| Answer» E. | |
| 7064. |
In Kjeldahl's method, the nitrogen present in the organic compound is quantitatively converted into [DCE 2003] |
| A. | Gaseous ammonia |
| B. | Ammonium sulphate |
| C. | Ammonium phosphate |
| D. | Ammonia |
| Answer» E. | |
| 7065. |
A compound has 3 chiral carbon atoms. The number of possible optical isomers it can have [DCE 2004] |
| A. | 3 |
| B. | 2 |
| C. | 8 |
| D. | 4 |
| Answer» D. 4 | |
| 7066. |
Which one is electrophilic addition [AMU (Engg.) 1999] |
| A. | \[C{{H}_{3}}-C{{H}_{3}}+C{{l}_{2}}\to {{C}_{2}}{{H}_{5}}Cl+HCl\] |
| B. | \[C{{H}_{3}}CH=O+HCN\to {{(C{{H}_{3}})}_{2}}C(OH)CN\] |
| C. | \[B{{r}_{2}}\to B{{r}^{\bullet }}+B{{r}^{\bullet }}\] |
| D. | \[C{{H}_{2}}=C{{H}_{2}}+B{{r}_{2}}\to C{{H}_{2}}BrC{{H}_{2}}Br\] |
| Answer» E. | |
| 7067. |
Which one of the following reactions is most suitable for the preparation of n-propyl benzene [MP PET/PMT 1998] |
| A. | Friedel-Craft's reaction |
| B. | Wurtz reaction |
| C. | Wurtz-Fittig reaction |
| D. | Grignard reaction |
| Answer» D. Grignard reaction | |
| 7068. |
The energy of the electron in the first orbit of \[H{{e}^{+}}\] is \[-871.6\times {{10}^{-20}}J\]. The energy of the electron in the first orbit of hydrogen would be [Roorkee Qualifying 1998] |
| A. | \[-871.6\times {{10}^{-20}}J\] |
| B. | \[-435.8\times {{10}^{-20}}J\] |
| C. | \[-217.9\times {{10}^{-20}}J\] |
| D. | \[-108.9\times {{10}^{-20}}J\] |
| Answer» D. \[-108.9\times {{10}^{-20}}J\] | |
| 7069. |
The set of numerical coefficient that balances the equation\[{{K}_{2}}Cr{{O}_{4}}+HCl\to {{K}_{2}}C{{r}_{2}}{{O}_{7}}+KCl+{{H}_{2}}O\] is [Kerala CEE 2001] |
| A. | 1, 1, 2, 2, 1 |
| B. | 2, 2, 1, 1, 1 |
| C. | 2, 1, 1, 2, 1 |
| D. | 2, 2, 1, 2, 1 |
| Answer» E. | |
| 7070. |
Which of the following arrangement of molecules is correct on the basis of their dipole moments [AIIMS 2002] |
| A. | \[B{{F}_{3}}>N{{F}_{3}}>N{{H}_{3}}\] |
| B. | \[N{{F}_{3}}>B{{F}_{3}}>N{{H}_{3}}\] |
| C. | \[N{{H}_{3}}>B{{F}_{3}}>N{{F}_{3}}\] |
| D. | \[N{{H}_{3}}>N{{F}_{3}}>B{{F}_{3}}\] |
| Answer» E. | |
| 7071. |
The ratio of rates of diffusion of \[S{{O}_{2}},\,{{O}_{2}}\] and \[C{{H}_{4}}\] is [BHU 1992] |
| A. | \[1:\sqrt{2}:2\] |
| B. | 1 : 2 : 4 |
| C. | \[2:\sqrt{2}:1\] |
| D. | \[1:2:\sqrt{2}\] |
| Answer» B. 1 : 2 : 4 | |
| 7072. |
For the reaction \[CO(g)+{{H}_{2}}O(g)\]⇌\[C{{O}_{2}}(g)+{{H}_{2}}(g)\] at a given temperature, the equilibrium amount of \[C{{O}_{2}}(g)\] can be increased by [IIT 1998] |
| A. | Adding a suitable catalyst |
| B. | Adding an inert gas |
| C. | Decreasing the volume of the container |
| D. | Increasing the amount \[CO(g)\] |
| Answer» E. | |
| 7073. |
\[p{{K}_{a}}\] values of two acids A and B are 4 and 5. The strengths of these two acids are related as [KCET 2001] |
| A. | Acid A is 10 times stronger than acids B |
| B. | Strength of acid A: strength a of acid \[B=4:5\] |
| C. | The strengths of the two acids can not be compared |
| D. | Acid B is 10 times stronger than acid A |
| Answer» B. Strength of acid A: strength a of acid \[B=4:5\] | |
| 7074. |
The pair of amphoteric hydroxides is [AIIMS 2005] |
| A. | \[Al{{(OH)}_{3}},\ LiOH\] |
| B. | \[Be{{(OH)}_{2}},\ Mg{{(OH)}_{2}}\] |
| C. | \[B{{(OH)}_{3}},\ Be{{(OH)}_{2}}\] |
| D. | \[Be{{(OH)}_{2}},\ Zn{{(OH)}_{2}}\] |
| Answer» E. | |
| 7075. |
Which of the following statement is correct with respect to the property of elements with an increase in atomic number in the carbon family (group 14) [BHU 2004] |
| A. | Atomic size decrease |
| B. | Ionization energy increase |
| C. | Metallic character decrease |
| D. | Stability of +2 oxidation state increase |
| Answer» E. | |
| 7076. |
Which of the following pair will have effective magnetic moment equal |
| A. | \[C{{r}^{+3}}\] and \[M{{n}^{+2}}\] |
| B. | \[C{{r}^{+2}}\] and \[F{{e}^{+2}}\] |
| C. | \[{{V}^{+2}}\] and \[S{{c}^{+3}}\] |
| D. | \[T{{i}^{+2}}\] and \[{{V}^{+2}}\] |
| Answer» C. \[{{V}^{+2}}\] and \[S{{c}^{+3}}\] | |
| 7077. |
Transition metal with low oxidation number will act as [DCE 2001] |
| A. | A base |
| B. | An acid |
| C. | An oxidising agent |
| D. | None of these |
| Answer» D. None of these | |
| 7078. |
\[116mg\] of a compound on vaporization in a Victor Meyer?s apparatus displaces \[44.8\,ml\] of air measured at S.T.P. The molecular weight of the compounds is [Kerala PMT 2004] |
| A. | 116 |
| B. | 232 |
| C. | 58 |
| D. | 44.8 |
| E. | 46.4 |
| Answer» D. 44.8 | |
| 7079. |
The molecular formula of diphenyl methane, , is \[{{C}_{13}}{{H}_{12}}\] How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom [CBSE PMT 2004] |
| A. | 8 |
| B. | 7 |
| C. | 6 |
| D. | 4 |
| Answer» E. | |
| 7080. |
In the case homologous series of alkanes, which one of the following statements is incorrect? [JIPMER 2000] |
| A. | The members of the series are isomers of each other |
| B. | The members of the series have similar chemical properties |
| C. | The members of the series have the general formula\[{{C}_{n}}{{H}_{2n+2}}\], where n is an integer |
| D. | The difference between any two successive members of the series corresponds to 14 unit of relative atomic mass |
| Answer» B. The members of the series have similar chemical properties | |
| 7081. |
In the given conformation \[{{C}_{2}}\] is rotated about \[{{C}_{2}}-{{C}_{3}}\] bond anticlockwise by an angle of \[120{}^\circ \] then the conformation obtained is [AIIMS 2004] |
| A. | Fully eclipsed conformation |
| B. | Partially eclipsed conformation |
| C. | Gauche conformation |
| D. | Staggered conformation |
| Answer» D. Staggered conformation | |
| 7082. |
Which of the following atoms and ions are isoelectronic i.e. have the same number of electrons with the neon atom [NCERT 1978] |
| A. | \[{{F}^{-}}\] |
| B. | Oxygen atom |
| C. | \[Mg\] |
| D. | \[{{N}^{-}}\] |
| Answer» B. Oxygen atom | |
| 7083. |
Mixture of sand and sulphur may best be separated by [Kerala CET 2001] |
| A. | Fractional crystallisation from aqueous solution |
| B. | Magnetic method |
| C. | Fractional distillation |
| D. | Dissolving in \[C{{S}_{2}}\] and filtering |
| Answer» E. | |
| 7084. |
The values of electronegativity of atoms A and B are 1.20 and 4.0 respectively. The percentage of ionic character of A ? B bond is [MP PET 2003] |
| A. | 50 % |
| B. | 43 % |
| C. | 55.3 % |
| D. | 72.24% |
| Answer» E. | |
| 7085. |
As the temperature is raised from \[{{20}^{o}}C\] to \[{{40}^{o}}C\] the average kinetic energy of neon atoms changes by a factor of which of the following [AIEEE 2004] |
| A. | 313/293 |
| B. | \[\sqrt{(313/293)}\] |
| C. | 1/2 |
| D. | 2 |
| Answer» B. \[\sqrt{(313/293)}\] | |
| 7086. |
The \[{{K}_{SP}}\] of \[AgI\] is \[1.5\times {{10}^{-16}}\]. On mixing equal volumes of the following solutions, precipitation will occur only with [AMU 2000] |
| A. | \[{{10}^{-7}}M\,A{{g}^{+}}\] and \[{{10}^{-19}}M\,{{I}^{-}}\] |
| B. | \[{{10}^{-8}}M\,A{{g}^{+}}\]and \[{{10}^{-8}}M\,{{I}^{-}}\] |
| C. | \[{{10}^{-16}}M\,A{{g}^{+}}\]and \[{{10}^{-16}}M\,{{I}^{-}}\] |
| D. | \[{{10}^{-9}}M\,A{{g}^{+}}\]and \[{{10}^{-9}}M\,{{I}^{-}}\] |
| Answer» C. \[{{10}^{-16}}M\,A{{g}^{+}}\]and \[{{10}^{-16}}M\,{{I}^{-}}\] | |
| 7087. |
The edge length of face centred unit cubic cell is \[508\,\,pm.\] If the radius of the cation is \[110\,\,pm,\] the radius of the anion is [CBSE PMT 1998] |
| A. | \[285\,\,pm\] |
| B. | \[398\,\,pm\] |
| C. | \[144\,\,pm\] |
| D. | \[618\,\,pm\] |
| Answer» D. \[618\,\,pm\] | |
| 7088. |
Which has no rotation of symmetry [Orrisa JEE 2004] |
| A. | Hexagonal |
| B. | Orthorhombic |
| C. | Cubic |
| D. | Triclinic |
| Answer» E. | |
| 7089. |
A match box exhibits [MP PET 1993, 95] |
| A. | Cubic geometry |
| B. | Monoclinic geometry |
| C. | Orthorhombic geometry |
| D. | Tetragonal geometry |
| Answer» D. Tetragonal geometry | |
| 7090. |
What type of crystal defect is indicated in the diagram below [AIEEE 2004] \[N{{a}^{+}}\,\,C{{l}^{-}}\,\,N{{a}^{+}}\,\,C{{l}^{-}}\,\,\,N{{a}^{+}}\,\,\,C{{l}^{-}}\] \[C{{l}^{-}}\] ¨ \[C{{l}^{-}}\] \[N{{a}^{+}}\] ¨ \[N{{a}^{+}}\] \[N{{a}^{+}}\] \[C{{l}^{-}}\]¨ \[C{{l}^{-}}\] \[N{{a}^{+}}\] \[C{{l}^{-}}\] \[C{{l}^{-}}\] \[N{{a}^{+}}\] \[C{{l}^{-}}\] \[N{{a}^{+}}\] ¨ \[N{{a}^{+}}\] |
| A. | Interstitial defect |
| B. | Schottky defect |
| C. | Frenkel defect |
| D. | Frenkel and Schottky defects |
| Answer» C. Frenkel defect | |
| 7091. |
The basic building unit of all silicates is [UPSEAT 2002] |
| A. | \[Si{{O}_{4}}\] square planar |
| B. | \[{{[Si{{O}_{4}}]}^{4-}}\] tetrahedron |
| C. | \[Si{{O}_{4}}\] octahedron |
| D. | \[Si{{O}_{4}}\] linear |
| Answer» C. \[Si{{O}_{4}}\] octahedron | |
| 7092. |
For some crystals, the radius ratio for cation and anion is 0.525, its coordination number will be |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 7093. |
If the coordination of \[C{{a}^{2+}}\]in \[Ca{{F}_{2}}\] is 8, then the coordination number of \[{{F}^{-}}\] ion would be |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 7094. |
If the pressure on a \[NaCl\] structure is increased, then its coordination number will [AFMC 2000] |
| A. | Increase |
| B. | Decrease |
| C. | Remain the same |
| D. | Either B or C |
| Answer» B. Decrease | |
| 7095. |
An element (atomic mass \[100g/mol)\] having \[bcc\] structure has unit cell edge \[400\,\,pm.\] Then density of the element is [CBSE PMT 1996; AIIMS 2002] |
| A. | \[10.376\,\,g/c{{m}^{3}}\] |
| B. | \[5.188\,\,g/c{{m}^{3}}\] |
| C. | \[7.289\,\,g/c{{m}^{3}}\] |
| D. | \[2.144\,\,g/c{{m}^{3}}\] |
| Answer» C. \[7.289\,\,g/c{{m}^{3}}\] | |
| 7096. |
Which one of the following is not a surfactant [AIIMS 2003] |
| A. | \[C{{H}_{3}}-{{(C{{H}_{2}})}_{15}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{{{N}^{+}}-}}}\,}}}\,C{{H}_{3}}B{{r}^{-}}\] |
| B. | \[C{{H}_{3}}-{{(C{{H}_{2}})}_{14}}-C{{H}_{2}}-N{{H}_{2}}\] |
| C. | \[C{{H}_{3}}-{{(C{{H}_{2}})}_{16}}-C{{H}_{2}}OSO_{2}^{-}N{{a}^{+}}\] |
| D. | \[OHC-{{(C{{H}_{2}})}_{14}}-C{{H}_{2}}-CO{{O}^{-}}N{{a}^{+}}\] |
| Answer» C. \[C{{H}_{3}}-{{(C{{H}_{2}})}_{16}}-C{{H}_{2}}OSO_{2}^{-}N{{a}^{+}}\] | |
| 7097. |
Which is not colloidal [CPMT 1984; MP PET 1989, 91] |
| A. | Chlorophyll |
| B. | Egg |
| C. | Ruby glass |
| D. | Milk |
| Answer» B. Egg | |
| 7098. |
Which one of the following is an incorrect statement for physisorption [MP PET 2002] |
| A. | It is a reversible process |
| B. | It requires less heat of adsorption |
| C. | It requires activation energy |
| D. | It takes place at low temperature |
| Answer» D. It takes place at low temperature | |
| 7099. |
The decomposition of hydrogen peroxide can be slowed by the addition of a small amount of acetamide. The latter acts as a [MNR 1978] |
| A. | Detainer |
| B. | Stopper |
| C. | Promoter |
| D. | Inhibitor |
| Answer» E. | |
| 7100. |
Which of the following forms cationic miscelles above certain concentration [CBSE PMT 2004] |
| A. | Urea |
| B. | Cetyltrimethylammonium bromide |
| C. | Sodium dodecyl sulphate |
| D. | Sodium acetate |
| Answer» E. | |