MCQOPTIONS
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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.
| 6951. |
\[MnO_{4}^{2-}\] (1 mole) in neutral aqueous medium is disproportionate to [AIIMS 2003] |
| A. | 2/3 mole of \[MnO_{4}^{-}\] and 1/3 mole of\[Mn{{O}_{2}}\] |
| B. | 1/3 mole of \[MnO_{4}^{-}\] and 2/3 mole of \[Mn{{O}_{2}}\] |
| C. | 1/3 mole of \[M{{n}_{2}}{{O}_{7}}\]and 1/3 mole of \[Mn{{O}_{2}}\] |
| D. | 2/3 mole of \[M{{n}_{2}}{{O}_{7}}\] and 1/3 mole of \[Mn{{O}_{2}}\] |
| Answer» B. 1/3 mole of \[MnO_{4}^{-}\] and 2/3 mole of \[Mn{{O}_{2}}\] | |
| 6952. |
Whose bond energy is maximum [CPMT 1988; MP PMT 1990] |
| A. | \[{{F}_{2}}\] |
| B. | \[C{{l}_{2}}\] |
| C. | \[B{{r}_{2}}\] |
| D. | \[{{I}_{2}}\] |
| Answer» C. \[B{{r}_{2}}\] | |
| 6953. |
Which of the following have high electron affinity [BHU 2000, 05] |
| A. | F |
| B. | Cl |
| C. | N |
| D. | O |
| Answer» C. N | |
| 6954. |
Among the following, the compound that is both paramagnetic and coloured is [IIT-JEE 1997] |
| A. | \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| B. | \[{{(N{{H}_{4}})}_{2}}(TiC{{l}_{6}})\] |
| C. | \[VOS{{O}_{4}}\] |
| D. | \[{{K}_{3}}\left[ Cu(C{{N}_{4}}) \right]\] |
| Answer» D. \[{{K}_{3}}\left[ Cu(C{{N}_{4}}) \right]\] | |
| 6955. |
The frequency of one of the lines in Paschen series of hydrogen atom is \[2.340\times {{10}^{11}}Hz.\] The quantum number \[{{n}_{2}}\] which produces this transition is [DPMT 2001] |
| A. | 6 |
| B. | 5 |
| C. | 4 |
| D. | 3 |
| Answer» C. 4 | |
| 6956. |
In which of the following the central atom does not use sp3 hybrid orbitals in its bonding [UPSEAT 2001, 02] |
| A. | \[BeF_{3}^{-}\] |
| B. | \[OH_{3}^{+}\] |
| C. | \[NH_{2}^{-}\] |
| D. | \[N{{F}_{3}}\] |
| Answer» B. \[OH_{3}^{+}\] | |
| 6957. |
If pressure becomes double at the same absolute temperature on 2 L\[C{{O}_{2}}\], then the volume of \[C{{O}_{2}}\] becomes [AIIMS 1992] |
| A. | 2 L |
| B. | 4 L |
| C. | 25 L |
| D. | 1 L |
| Answer» E. | |
| 6958. |
Arrange the acids (I) \[{{H}_{2}}S{{O}_{3}}\] (II) H3PO3 and (III) HClO3 in the decreasing order of acidity [UPSEAT 2001] |
| A. | I > III > II |
| B. | I > II > III |
| C. | II > III > I |
| D. | III > I > II |
| Answer» E. | |
| 6959. |
Which of the following can act as an acid and as a base [AMU 1999] |
| A. | \[HClO_{3}^{-}\] |
| B. | \[{{H}_{2}}PO_{4}^{-}\] |
| C. | \[H{{S}^{-}}\] |
| D. | All of these |
| Answer» E. | |
| 6960. |
Which of the following oxides is amphoteric in character [AIEEE 2005] |
| A. | \[CaO\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[Si{{O}_{2}}\] |
| D. | \[Sn{{O}_{2}}\] |
| Answer» E. | |
| 6961. |
Which is least soluble in water [MNR 1984, 89] |
| A. | \[AgCl\] |
| B. | \[AgBr\] |
| C. | \[AgI\] |
| D. | \[A{{g}_{2}}S\] |
| E. | \[AgF\] |
| Answer» E. \[AgF\] | |
| 6962. |
\[S{{N}^{1}}\] reaction is faster in [Orissa JEE 2004] |
| A. | \[C{{H}_{3}}C{{H}_{2}}Cl\] |
| B. | \[\begin{matrix} C{{H}_{3}} \\ C{{H}_{3}} \\ \end{matrix}>CH-Cl\] |
| C. | \[C{{H}_{3}}-\underset{C{{H}_{3}}\ }{\overset{C{{H}_{3}}\ }{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,-Cl}}}\,\] |
| D. | \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{\underset{|}{\mathop{C}}\,{{H}_{2}}}{\mathop{\underset{|}{\mathop{C}}\,H\ }}\,}}\,-Cl\] |
| Answer» D. \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{\underset{|}{\mathop{C}}\,{{H}_{2}}}{\mathop{\underset{|}{\mathop{C}}\,H\ }}\,}}\,-Cl\] | |
| 6963. |
How many primary, secondary, tertiary and quaternary carbons are present in the following hydrocarbon \[C{{H}_{3}}-CH(C{{H}_{3}})-C{{(C{{H}_{3}})}_{2}}-C{{H}_{2}}-CH(C{{H}_{3}})-C{{H}_{2}}-C{{H}_{3}}\] |
| A. | Primary-6 Secondary-2 Tertiary-2 Quaternary-1 |
| B. | Primary-2 Secondary-6 Tertiary-3 Quaternary-0 |
| C. | Primary-2 Secondary-4 Tertiary-3 Quaternary-2 |
| D. | Primary-2 Secondary-2 Tertiary-4 Quaternary-3 |
| Answer» B. Primary-2 Secondary-6 Tertiary-3 Quaternary-0 | |
| 6964. |
Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of \[_{6}{{C}^{12}}\] [NCERT 1982] |
| A. | Will remain approximately the same |
| B. | Will become approximately two times |
| C. | Will remain approximately half |
| D. | Will be reduced by 25% |
| Answer» E. | |
| 6965. |
Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of [Kerala CEE 2002] |
| A. | Conservation of mass |
| B. | Constant composition |
| C. | Multiple proportions |
| D. | Constant volume |
| Answer» C. Multiple proportions | |
| 6966. |
\[O_{2}^{2-}\]is the symbol of ?.. ion [EAMCET 2003] |
| A. | Oxide |
| B. | Superoxide |
| C. | Peroxide |
| D. | Monoxide |
| Answer» D. Monoxide | |
| 6967. |
A gas is found to have a formula\[{{[CO]}_{x}}\]. If its vapour density is 70, the value of \[x\] is [DCE 2004] |
| A. | 2.5 |
| B. | 3.0 |
| C. | 5.0 |
| D. | 6.0 |
| Answer» D. 6.0 | |
| 6968. |
Ammonia under a pressure of 15 atm at 27°C is heated to 347°C in a closed vessel in the presence of a catalyst. Under the conditions, \[N{{H}_{3}}\] is partially decomposed according to the equation, \[2N{{H}_{3}}\]⇌ \[{{N}_{2}}+3{{H}_{2}}\].The vessel is such that the volume remains effectively constant whereas pressure increases to 50 atm. Calculate the percentage of \[N{{H}_{3}}\] actually decomposed. [IIT 1981; MNR 1991; UPSEAT 2001] |
| A. | 65% |
| B. | 61.3% |
| C. | 62.5% |
| D. | 64% |
| Answer» C. 62.5% | |
| 6969. |
The strongest Bronsted base in the following anion is [IIT 1981; MP PET 1992, 97; MP PMT 1994; RPMT 1999; KCET 2000; AIIMS 2001; UPSEAT 2002; AFMC 2002; Pb. CET 2004] |
| A. | \[Cl{{O}^{-}}\] |
| B. | \[ClO_{2}^{-}\] |
| C. | \[ClO_{3}^{-}\] |
| D. | \[ClO_{4}^{-}\] |
| Answer» B. \[ClO_{2}^{-}\] | |
| 6970. |
The compound which could not act both as oxidising as well as reducing agent is [IIT Screening 1991] |
| A. | \[S{{O}_{2}}\] |
| B. | \[Mn{{O}_{2}}\] |
| C. | \[A{{l}_{2}}{{O}_{3}}\] |
| D. | \[CrO\] |
| Answer» D. \[CrO\] | |
| 6971. |
Which of the following oxides is the most acidic [CBSE PMT 1999; MP PMT 2002] |
| A. | \[{{N}_{2}}{{O}_{5}}\] |
| B. | \[{{P}_{2}}{{O}_{5}}\] |
| C. | \[A{{s}_{2}}{{O}_{5}}\] |
| D. | \[S{{b}_{2}}{{O}_{5}}\] |
| Answer» B. \[{{P}_{2}}{{O}_{5}}\] | |
| 6972. |
Ionic radii of [IIT-JEE 1999] |
| A. | \[T{{i}^{4+}}<M{{n}^{7+}}\] |
| B. | \[^{35}C{{l}^{-}}{{<}^{37}}C{{l}^{-}}\] |
| C. | \[{{K}^{+}}>C{{l}^{-}}\] |
| D. | \[{{P}^{3+}}>{{P}^{5+}}\] |
| Answer» E. | |
| 6973. |
In nitroprusside ion, the iron and \[NO\] exist as \[F{{e}^{II}}\] and \[N{{O}^{+}}\] rather than \[F{{e}^{III}}\] and \[NO\]. These forms can be differentiated by [IIT-JEE 1998] |
| A. | Estimating the concentration of iron |
| B. | Measuring the concentration of \[C{{N}^{-}}\] |
| C. | Measuring the solid state magnetic moment |
| D. | Thermally decomposing the compound |
| Answer» D. Thermally decomposing the compound | |
| 6974. |
Examine the following three pairs of possible isomers Now state whether the pairs represent identical compounds or different isomers |
| A. | All three pairs represent different compounds |
| B. | (ia) and (ib) are identical; (iia) and (iib) are identical; and (iiia) and (iiib) are identical |
| C. | (ia) and (ib) are isomers; (iia) and (iib) are identical; and (iiia) and (iiib) are isomers |
| D. | (ia) and (ib) are identical; (iia) and (iib) are identical, and (iiia) and (iiib) are isomers |
| Answer» E. | |
| 6975. |
Formation of polyethylene from calcium carbide takes place as follows \[Ca{{C}_{2}}+2{{H}_{2}}O\to Ca{{(OH)}_{2}}+{{C}_{2}}{{H}_{2}}\] \[{{C}_{2}}{{H}_{2}}+{{H}_{2}}\to {{C}_{2}}{{H}_{4}}\] \[n({{C}_{2}}{{H}_{4}})\to {{(-C{{H}_{2}}-C{{H}_{2}}-)}_{n}}\] The amount of polyethylene obtained from 64.1 kg \[Ca{{C}_{2}}\] is [AIIMS 1997] |
| A. | 7 kg |
| B. | 14 kg |
| C. | 21 kg |
| D. | 28 kg |
| Answer» E. | |
| 6976. |
Which of the following has maximum number of unpaired electron (atomic number of Fe 26) [MP PMT 2001] |
| A. | Fe |
| B. | Fe (II) |
| C. | Fe (III) |
| D. | Fe (IV) |
| Answer» D. Fe (IV) | |
| 6977. |
Structure of \[IF_{4}^{+}\] and hybridization of iodine in this structure are [UPSEAT 2001] |
| A. | \[s{{p}^{3}}d\], Linear |
| B. | \[s{{p}^{3}}{{d}^{2}}\], T-shaped |
| C. | \[s{{p}^{3}}d\], Irregular tetrahedral |
| D. | \[s{{p}^{3}}{{d}^{2}}\], Octahedral |
| Answer» D. \[s{{p}^{3}}{{d}^{2}}\], Octahedral | |
| 6978. |
Pressure of a mixture of 4 g of \[{{O}_{2}}\] and 2 g of \[{{H}_{2}}\] confined in a bulb of 1 litre at \[{{0}^{o}}C\] is [AIIMS 2000] |
| A. | 25.215 atm |
| B. | 31.205 atm |
| C. | 45.215 atm |
| D. | 15.210 atm |
| Answer» B. 31.205 atm | |
| 6979. |
Dissociation constant of a weak acid is \[1\times {{10}^{-4}}\]. Equilibrium constant of its reaction with strong base is [UPSEAT 2003] |
| A. | \[1\times {{10}^{-4}}\] |
| B. | \[1\times {{10}^{10}}\] |
| C. | \[1\times {{10}^{-10}}\] |
| D. | \[1\times {{10}^{14}}\] |
| Answer» C. \[1\times {{10}^{-10}}\] | |
| 6980. |
In a balanced equation \[{{H}_{2}}S{{O}_{4}}+x\,HI\to {{H}_{2}}S+y\,{{I}_{2}}+z\,{{H}_{2}}O\], the values of x, y, z are [EAMCET 2003] |
| A. | x = 3, y = 5, z = 2 |
| B. | x = 4, y = 8, z = 5 |
| C. | x = 8, y = 4, z = 4 |
| D. | x = 5, y = 3, z = 4 |
| Answer» D. x = 5, y = 3, z = 4 | |
| 6981. |
Which of the following salt is insoluble in water [MP PET 2004] |
| A. | \[CuS{{O}_{4}}\] |
| B. | \[CdS{{O}_{4}}\] |
| C. | \[PbS{{O}_{4}}\] |
| D. | \[B{{i}_{2}}{{(S{{O}_{4}})}_{3}}\] |
| Answer» D. \[B{{i}_{2}}{{(S{{O}_{4}})}_{3}}\] | |
| 6982. |
Arrange F, Cl, O, N in the decreasing order of electronegativity |
| A. | \[O>F>N>Cl\] |
| B. | \[F>N>Cl>O\] |
| C. | \[Cl>F>N>O\] |
| D. | \[F>O>N\,\,\,>\]\[Cl\] |
| Answer» E. | |
| 6983. |
Amongest following the lowest degree of paramagnetism per mole of the compound at 298 K will be shown by |
| A. | \[MnS{{O}_{4}}.4{{H}_{2}}O\] |
| B. | \[CuS{{O}_{4}}.5{{H}_{2}}O\] |
| C. | \[FeS{{O}_{4}}.6{{H}_{2}}O\] |
| D. | \[FeS{{O}_{4}}.5{{H}_{2}}O\] |
| Answer» C. \[FeS{{O}_{4}}.6{{H}_{2}}O\] | |
| 6984. |
Which of the following will have geometrical isomers [MP PET 1996; MP PMT 1997; AFMC 1997] |
| A. | 2-methylpropene |
| B. | 2-butene |
| C. | 1-butene |
| D. | Propene |
| Answer» C. 1-butene | |
| 6985. |
Tautomerism is exhibited by [CBSE PMT 1997; KCET 2002] |
| A. | \[{{(C{{H}_{3}})}_{3}}CNO\] |
| B. | \[{{(C{{H}_{3}})}_{2}}NH\] |
| C. | \[{{R}_{3}}CN{{O}_{2}}\] |
| D. | \[RC{{H}_{2}}N{{O}_{2}}\] |
| Answer» E. | |
| 6986. |
Write the products of the addition reaction \[\,\,\,\,\,C=C\,\,\,\,\,+XY\to \] [Kerala (Med.) 2002] |
| A. | \[\,\,\,\,\,\underset{X}{\mathop{>\underset{|}{\mathop{C}}\,}}\,-\underset{\,Y\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,}{\mathop{C}}\,<}}\,\] |
| B. | \[X-\underset{|}{\mathop{C}}\,=\underset{|}{\mathop{C}}\,-Y\] |
| C. | \[\underset{|}{\overset{|}{\mathop{C}}}\,=\underset{Y}{\mathop{\underset{|}{\mathop{C}}\,}}\,-\] |
| D. | \[X-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-X\] |
| E. | \[\underset{|}{\overset{\overset{X}{\mathop{|}}\,}{\mathop{C}}}\,=\underset{\underset{Y}{\mathop{|}}\,}{\overset{|}{\mathop{C}}}\,\] |
| Answer» B. \[X-\underset{|}{\mathop{C}}\,=\underset{|}{\mathop{C}}\,-Y\] | |
| 6987. |
The third line in Balmer series corresponds to an electronic transition between which Bohr?s orbits in hydrogen [MP PMT 2001] |
| A. | 5 ® 3 |
| B. | 5 ® 2 |
| C. | 4 ® 3 |
| D. | 4 ® 2 |
| Answer» C. 4 ® 3 | |
| 6988. |
In the following reaction, which choice has value twice that of the equivalent mass of the oxidising agent \[S{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}3S+2{{H}_{2}}O\] [DPMT 2000] |
| A. | 64 |
| B. | 32 |
| C. | 16 |
| D. | 48 |
| Answer» C. 16 | |
| 6989. |
Molecular shapes of \[S{{F}_{4}},\,C{{F}_{4}}\] and \[Xe{{F}_{4}}\]are [IIT Screening 2000] |
| A. | The same with 2, 0 and 1 lone pairs of electrons respectively |
| B. | The same, with 1, 1 and 1 lone pairs of electrons respectively |
| C. | Different, with 0, 1 and 2 lone pairs of electrons respectively |
| D. | Different, with 1, 0 and 2 lone pairs of electrons respectively |
| Answer» E. | |
| 6990. |
At what temperature in the celsius scale, V (volume) of a certain mass of gas at \[{{27}^{o}}C\] will be doubled keeping the pressure constant [Orissa 1993] |
| A. | \[{{54}^{o}}C\] |
| B. | \[{{327}^{o}}C\] |
| C. | \[{{427}^{o}}C\] |
| D. | \[{{527}^{o}}C\] |
| Answer» C. \[{{427}^{o}}C\] | |
| 6991. |
The hydride ion \[{{H}^{-}}\]is stronger base than its hydroxide ion \[O{{H}^{-}}.\] Which of the following reaction will occur if sodium hydride \[(NaH)\] is dissolved in water [CBSE PMT 1997] |
| A. | \[{{H}^{-}}(aq)+{{H}_{2}}O\,\to \,{{H}_{2}}O\] |
| B. | \[{{H}^{-}}\,(aq)+{{H}_{2}}O\,(l)\,\to \,O{{H}^{-}}+{{H}_{2}}\] |
| C. | \[{{H}^{-}}\,+{{H}_{2}}O\,\to \]No reaction |
| D. | None of these |
| Answer» C. \[{{H}^{-}}\,+{{H}_{2}}O\,\to \]No reaction | |
| 6992. |
In the reaction \[{{B}_{2}}{{H}_{6}}+2KOH+2X\to 2Y+6{{H}_{2}},\] X and Y are respectively [EAMCET 2003] |
| A. | \[{{H}_{2}}\],\[{{H}_{3}}B{{O}_{3}}\] |
| B. | \[HCl\],\[KB{{O}_{3}}\] |
| C. | \[{{H}_{2}}O,\,\,KB{{O}_{3}}\] |
| D. | \[{{H}_{2}}O\],\[KB{{O}_{2}}\] |
| Answer» E. | |
| 6993. |
Which element having following electronic configurations has minimum ionization potential [NCERT 1978; KCET 1991; CBSE PMT 1991; Pb. PET 1999; BHU 2000] |
| A. | \[1{{s}^{1}}\] |
| B. | \[1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{6}}\] |
| C. | \[1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{6}},\,3{{s}^{1}}\] |
| D. | \[1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{2}}\] |
| Answer» D. \[1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{2}}\] | |
| 6994. |
The basic character of the transition metal monoxides follows the order [CBSE PMT 2003] |
| A. | \[TiO>VO>CrO>FeO\] |
| B. | \[VO>CrO>TiO>FeO\] |
| C. | \[CrO>VO>FeO>TiO\] |
| D. | \[TiO>FeO>VO>CrO\] (Atomic no. Ti = 22, V = 23, Cr = 24, Fe = 26) |
| Answer» B. \[VO>CrO>TiO>FeO\] | |
| 6995. |
Complete combustion of \[0.858\ g\] of compound X gives \[2.63\ g\] of \[C{{O}_{2}}\] and \[1.28\ g\] of \[{{H}_{2}}O\]. The lowest molecular mass X can have [Kerala MEE 2000] |
| A. | \[43\ g\] |
| B. | \[86\ g\] |
| C. | \[129\ g\] |
| D. | \[172\ g\] |
| Answer» B. \[86\ g\] | |
| 6996. |
Hybridisation state of chlorine in \[Cl{{F}_{3}}\] is [RPET 1999] |
| A. | \[s{{p}^{3}}\] |
| B. | \[s{{p}^{3}}d\] |
| C. | \[s{{p}^{3}}{{d}^{2}}\] |
| D. | \[s{{p}^{3}}{{d}^{3}}\] |
| Answer» C. \[s{{p}^{3}}{{d}^{2}}\] | |
| 6997. |
The ratio of the rate of diffusion of helium and methane under identical condition of pressure and temperature will be [IIT 2005] |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| D. | 0.5 |
| Answer» C. 1 | |
| 6998. |
Which equilibrium can be described as an acid-base reaction using the Lewis acid-base definition but not using the Bronsted-Lowry definition [AIIMS 1980] |
| A. | \[2N{{H}_{3}}+{{H}_{2}}S{{O}_{4}}\]⇄ \[2NH_{4}^{+}+SO_{4}^{2-}\] |
| B. | \[N{{H}_{3}}+C{{H}_{3}}COOH\]⇄ \[NH_{4}^{+}+C{{H}_{3}}CO{{O}^{-}}\] |
| C. | \[{{H}_{2}}O+C{{H}_{3}}COOH\]⇄ \[{{H}_{3}}{{O}^{+}}+C{{H}_{3}}CO{{O}^{-}}\] |
| D. | \[{{[Cu{{({{H}_{2}}O)}_{4}}]}^{2+}}+4N{{H}_{3}}\]⇄ \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}+4{{H}_{2}}O\] |
| Answer» E. | |
| 6999. |
For the reactions, \[C+{{O}_{2}}\to C{{O}_{2}};\Delta H=-393J\] \[2\,\,Zn+{{O}_{2}}\to 2\,\,ZnO;\Delta H=-412J\] [AIEEE 2002] |
| A. | Carbon can oxidise \[Zn\] |
| B. | Oxidation of carbon is not feasible |
| C. | Oxidation of \[Zn\]is not feasible |
| D. | \[Zn\] can oxidise carbon |
| Answer» E. | |
| 7000. |
The number of d-electrons in \[F{{e}^{2+}}\](at no. of \[Fe=26\]) is not equal to that of the [MNR 1994] |
| A. | p - electrons in Ne (at. no. = 10) |
| B. | s - electrons in \[Mg\] (at. no. = 12) |
| C. | d - electrons in \[Fe\] |
| D. | p - electrons in \[C{{l}^{-}}\] (at. no. of \[Cl=17\]) |
| Answer» E. | |