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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.
| 7001. |
Carbocation which is most stable [BHU 2003] |
| A. | \[C{{H}_{3}}C{{H}_{2}}^{+}\] |
| B. | \[C{{H}_{3}}^{+}\] |
| C. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}^{+}\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}^{+}\] |
| Answer» D. \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}^{+}\] | |
| 7002. |
Which of the following is not aromatic [Pb. CET 2000] |
| A. | Benzene |
| B. | Naphthalene |
| C. | Pyridine |
| D. | 1,3,5 heptatriene |
| Answer» E. | |
| 7003. |
The energy required to dislodge electron from excited isolated H-atom, \[I{{E}_{1}}=13.6\,\,eV\] is [DCE 2000] |
| A. | \[=\,13.6\,eV\] |
| B. | \[>\,13.6\,eV\] |
| C. | \[<13.6\]and\[>3.4\,eV\] |
| D. | \[\le \,3.4\,eV\] |
| Answer» E. | |
| 7004. |
The mass of \[112\ c{{m}^{3}}\] of \[C{{H}_{4}}\] gas at STP is [Karnataka CET 2001] |
| A. | \[0.16\ g\] |
| B. | \[0.8\ g\] |
| C. | \[0.08\ g\] |
| D. | \[1.6\ g\] |
| Answer» D. \[1.6\ g\] | |
| 7005. |
Bond length of ethane (I), ethene (II), acetylene (III) and benzene (IV) follows the order [CPMT 1999] |
| A. | \[I>II>III>IV\] |
| B. | \[I>II>IV>III\] |
| C. | \[I>IV>II>III\] |
| D. | \[III>IV>II>I\] |
| Answer» D. \[III>IV>II>I\] | |
| 7006. |
The volume of 1 g each of methane \[(C{{H}_{4}})\], ethane \[({{C}_{2}}{{H}_{6}})\], propane\[({{C}_{3}}{{H}_{8}})\] and butane \[({{C}_{4}}{{H}_{10}})\] was measured at 350 K and 1 atm. What is the volume of butane [NCERT 1981] |
| A. | 495 \[c{{m}^{3}}\] |
| B. | 600 \[c{{m}^{3}}\] |
| C. | 900 \[c{{m}^{3}}\] |
| D. | 1700 \[c{{m}^{3}}\] |
| Answer» B. 600 \[c{{m}^{3}}\] | |
| 7007. |
The strongest of the four acids listed below is [NCERT 1984] |
| A. | \[mol\,\,litr{{e}^{-1}}.\] |
| B. | \[C{{H}_{3}}COOH\] |
| C. | \[ClC{{H}_{2}}COOH\] |
| D. | \[FC{{H}_{2}}COOH\] |
| Answer» E. | |
| 7008. |
Which one of the following reactions is not an example of redox reaction [Kurukshetra CEE 1998] |
| A. | \[C{{l}_{2}}+2{{H}_{2}}O+S{{O}_{2}}\to 4{{H}^{+}}+S{{O}^{4-}}+2C{{l}^{-}}\] |
| B. | \[C{{u}^{++}}+Zn\to Z{{n}^{++}}+Cu\] |
| C. | \[2{{H}_{2}}+{{O}_{2}}\to 2{{H}_{2}}O\] |
| D. | \[HCl+{{H}_{2}}O\to {{H}_{3}}{{O}^{-}}+C{{l}^{-}}\] |
| Answer» E. | |
| 7009. |
Which of the following is more paramagnetic [DCE 2001] |
| A. | \[F{{e}^{+2}}\] |
| B. | \[F{{e}^{+3}}\] |
| C. | \[C{{r}^{+3}}\] |
| D. | \[M{{n}^{+3}}\] |
| Answer» C. \[C{{r}^{+3}}\] | |
| 7010. |
The compound is known by which of the following names [MP PET 1997] |
| A. | Bicyclo-[2, 2, 2] octane |
| B. | Bicyclo-[2, 2, 1] octane |
| C. | Bicyclo-[1, 2, 1] octane |
| D. | Bicyclo-[1, 1, 1] octane |
| Answer» B. Bicyclo-[2, 2, 1] octane | |
| 7011. |
Naphthalene is a/an [AFMC 2004] |
| A. | Ionic solid |
| B. | Covalent solid |
| C. | Metallic solid |
| D. | Molecular solid |
| Answer» E. | |
| 7012. |
What volume of Hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by Hydrogen [AIEEE 2003] |
| A. | 22.4 L |
| B. | 89.6 L |
| C. | 67.2 L |
| D. | 44.8 L |
| Answer» D. 44.8 L | |
| 7013. |
The ionization energy of hydrogen atom is \[-13.6\,eV.\] The energy required to excite the electron in a hydrogen atom from the ground state to the first excited state is (Avogadro?s constant = 6.022 × 1023) [BHU 1999] |
| A. | \[1.69\times {{10}^{-20}}J\] |
| B. | \[1.69\times {{10}^{-23}}J\] |
| C. | \[1.69\times {{10}^{23}}J\] |
| D. | \[1.69\times {{10}^{25}}J\] |
| Answer» C. \[1.69\times {{10}^{23}}J\] | |
| 7014. |
In the dichromate dianion [IIT 1999] |
| A. | \[4\,Cr-O\]bonds are equivalent |
| B. | \[6\,Cr-O\]bonds are equivalent |
| C. | All \[Cr-O\] bonds are equivalent |
| D. | All \[Cr-O\] bonds are non-equivalent |
| Answer» C. All \[Cr-O\] bonds are equivalent | |
| 7015. |
In an experiment during the analysis of a carbon compound, 145 \[l\] of \[{{H}_{2}}\] was collected at 760 mm Hg pressure and \[{{27}^{o}}C\] temperature. The mass of \[{{H}_{2}}\] is nearly [MNR 1987] |
| A. | 10 g |
| B. | 12 g |
| C. | 24 g |
| D. | 6 g |
| Answer» C. 24 g | |
| 7016. |
Which of the following is the strongest acid [AMU 1999; MH CET 1999, 2002] |
| A. | \[SO{{(OH)}_{2}}\] |
| B. | \[S{{O}_{2}}{{(OH)}_{2}}\] |
| C. | \[Cl{{O}_{3}}(OH)\] |
| D. | \[PO{{(OH)}_{3}}\] |
| Answer» D. \[PO{{(OH)}_{3}}\] | |
| 7017. |
The oxidation number of sulphur in \[{{S}_{8}},\,{{S}_{2}}{{F}_{2}},\,{{H}_{2}}S\] respectively, are [IIT 1999] |
| A. | 0, +1 and - 2 |
| B. | + 2, +1 and - 2 |
| C. | 0, + 1 and + 2 |
| D. | - 2, + 1 and - 2 |
| Answer» B. + 2, +1 and - 2 | |
| 7018. |
Total number of lone pair of electrons in \[XeO{{F}_{4}}\] is [IIT-JEE (Screening) 2004] |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 7019. |
Which of the following is not an element [DCE 2001] |
| A. | Graphite |
| B. | Diamond |
| C. | 22-carat gold |
| D. | Rhombic sulphur |
| Answer» D. Rhombic sulphur | |
| 7020. |
Name of the compound given below is [CBSE PMT 2003] |
| A. | 5-ethyl-6-methyloctane |
| B. | 4-ethyl-3-methyloctane |
| C. | 3-methyl-4-ethyloctane |
| D. | 2, 3-diethylheptane |
| Answer» C. 3-methyl-4-ethyloctane | |
| 7021. |
In the reaction : \[HC\equiv CH+2AgN{{O}_{3}}\xrightarrow{N{{H}_{4}}OH}X+2N{{H}_{4}}N{{O}_{3}}+2{{H}_{2}}O\] ?X? is |
| A. | \[A{{g}_{2}}C\] |
| B. | \[A{{g}_{2}}{{C}_{2}}\] |
| C. | \[AgC\] |
| D. | \[AgOH\] |
| Answer» C. \[AgC\] | |
| 7022. |
The series limit for Balmer series of H-spectra is [AMU (Engg.) 1999] |
| A. | 3800 |
| B. | 4200 |
| C. | 3646 |
| D. | 4000 |
| Answer» D. 4000 | |
| 7023. |
A 100 ml solution of 0.1 n HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30 ml of NaOH solution. The remaining titration was completed by adding 0.25 N KOH solution. The volume of KOH required for completing the titration is [DCE 1999] |
| A. | 70 ml |
| B. | 32 ml |
| C. | 35 ml |
| D. | 16 ml |
| Answer» E. | |
| 7024. |
The correct order of increasing \[C-O\] bond length of \[CO,\,\,CO_{3}^{2-},\,\,C{{O}_{2}}\] is [IIT 1999] |
| A. | \[CO_{3}^{2-}<C{{O}_{2}}<CO\] |
| B. | \[C{{O}_{2}}<CO_{3}^{2-}<CO\] |
| C. | \[CO<CO_{3}^{2-}<C{{O}_{2}}\] |
| D. | \[CO<C{{O}_{2}}<CO_{3}^{2-}\] |
| Answer» E. | |
| 7025. |
A sample of \[{{O}_{2}}\] gas is collected over water at \[{{23}^{o}}C\] at a barometric pressure of 751 mm Hg (vapour pressure of water at \[{{23}^{o}}C\] is 21 mm Hg). The partial pressure of \[{{O}_{2}}\] gas in the sample collected is [CBSE PMT 1993] |
| A. | 21 mm Hg |
| B. | 751 mm Hg |
| C. | 0.96 atm |
| D. | 1.02 atm |
| Answer» D. 1.02 atm | |
| 7026. |
The \[pH\] of \[0.1\,\,M\] solution of the following salts increases in the order [IIT 1999] |
| A. | \[NaCl<N{{H}_{4}}Cl<NaCN<HCl\] |
| B. | \[HCl<N{{H}_{4}}Cl<NaCl<NaCN\] |
| C. | \[NaCN<N{{H}_{4}}Cl<NaCl<HCl\] |
| D. | \[HCl<NaCl<NaCN<N{{H}_{4}}Cl\] |
| Answer» E. | |
| 7027. |
The compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superconductivity has copper in oxidation state ........ Assume that the rare earth element Yttrium is in its usual \[+\,3\] oxidation state [IIT 1994] |
| A. | 3/7 |
| B. | 7/3 |
| C. | 3 |
| D. | 7 |
| Answer» C. 3 | |
| 7028. |
The metal which does not form ammonium nitrate by reaction with dilute nitric acid is [KCET 2004] |
| A. | Al |
| B. | Fe |
| C. | Pb |
| D. | Mg |
| Answer» D. Mg | |
| 7029. |
The first ionization potentials in electron volts of nitrogen and oxygen atoms are respectively given by [IIT 1987] |
| A. | 14.6, 13.6 |
| B. | 13.6, 14.6 |
| C. | 13.6, 13.6 |
| D. | 14.6, 14.6 |
| Answer» B. 13.6, 14.6 | |
| 7030. |
The IUPAC name of the compound is [AIEEE 2004] |
| A. | 3, 3- dimethyl-1-cyclohexanol |
| B. | 1, 1-dimethyl-3-hydroxy cyclohexane |
| C. | 3, 3-dimethyl-1-hydroxy cyclohexane |
| D. | 1, 1-dimethyl-3-cyclohexanol |
| Answer» B. 1, 1-dimethyl-3-hydroxy cyclohexane | |
| 7031. |
Number of isomers of \[{{C}_{4}}{{H}_{10}}\] is [CBSE PMT 1996; AFMC 1997; RPMT 2002; MP PMT 1997] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | Isomerism not exist |
| Answer» B. 3 | |
| 7032. |
The compound \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{\,\,|\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C\,\,=\,\,}}\,}}\,CH-C{{H}_{3}}\] on reaction with \[NaI{{O}_{4}}\]in the presence of \[KMn{{O}_{4}}\]gives [CBSE PMT 2003] |
| A. | \[C{{H}_{3}}CHO+C{{O}_{2}}\] |
| B. | \[C{{H}_{3}}COC{{H}_{3}}\] |
| C. | \[C{{H}_{3}}COC{{H}_{3}}+C{{H}_{3}}COOH\] |
| D. | \[C{{H}_{3}}COC{{H}_{3}}+C{{H}_{3}}CHO\] |
| Answer» E. | |
| 7033. |
The frequency of a wave of light is \[12\times {{10}^{14}}{{s}^{-1}}.\] The wave number associated with this light is [Pb. PMT 1999] |
| A. | \[5\times {{10}^{-7}}m\] |
| B. | \[4\times {{10}^{-8}}c{{m}^{-1}}\] |
| C. | \[2\times {{10}^{-7}}{{m}^{-1}}\] |
| D. | \[4\times {{10}^{4}}c{{m}^{-1}}\] |
| Answer» E. | |
| 7034. |
3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water, 20 ml of this solution requires 18 ml of \[KMn{{O}_{4}}\] during titration for complete oxidation. The weight of \[KMn{{O}_{4}}\] present in one litre of the solution is [Tamilnadu CET 2002] |
| A. | 3.476 g |
| B. | 12.38 g |
| C. | 34.76 g |
| D. | 1.238 g |
| Answer» B. 12.38 g | |
| 7035. |
In the compound \[C{{H}_{2}}=CH-C{{H}_{2}}-C{{H}_{2}}-C\equiv CH,\] the \[{{C}_{2}}-{{C}_{3}}\] bond is of the type [IIT 1999] |
| A. | \[sp-s{{p}^{2}}\] |
| B. | \[s{{p}^{3}}-s{{p}^{3}}\] |
| C. | \[sp-s{{p}^{3}}\] |
| D. | \[s{{p}^{2}}-s{{p}^{3}}\] |
| Answer» E. | |
| 7036. |
The dissociation constant of a weak acid is \[1.0\times {{10}^{-5}},\] the equilibrium constant for the reaction with strong base is [MP PMT 1990] |
| A. | \[1.0\times {{10}^{-5}}\] |
| B. | \[1.0\times {{10}^{-9}}\] |
| C. | \[1.0\times {{10}^{9}}\] |
| D. | \[1.0\times {{10}^{14}}\] |
| Answer» D. \[1.0\times {{10}^{14}}\] | |
| 7037. |
In which of the following compounds, is the oxidation number of iodine is fractional [BVP 2003] |
| A. | \[I{{F}_{3}}\] |
| B. | \[I{{F}_{2}}\] |
| C. | \[I_{3}^{-}\] |
| D. | \[I{{F}_{7}}\] |
| Answer» D. \[I{{F}_{7}}\] | |
| 7038. |
The composition of the common glass is [DCE 2004] |
| A. | \[N{{a}_{2}}O.CaO.6Si{{O}_{3}}\] |
| B. | \[N{{a}_{2}}O.A{{l}_{2}}{{O}_{3}}.Si{{O}_{2}}\] |
| C. | \[CaO.A{{l}_{2}}{{O}_{3}}.Si{{O}_{2}}\] |
| D. | \[N{{a}_{2}}O.CaO.6Si{{O}_{2}}\] |
| Answer» E. | |
| 7039. |
Which of the following configurations represents atoms of the elements having the highest second ionization energy [Pb. PMT 1998] |
| A. | \[1{{s}^{2}}2{{s}^{2}}2{{p}^{4}}\] |
| B. | \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\] |
| C. | \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{1}}\] |
| D. | \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}\] |
| Answer» D. \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}\] | |
| 7040. |
What is the correct IUPAC name of [MP PMT 2003] |
| A. | 4-methoxy-2-nitrobenzaldehyde |
| B. | 4-formyl-3-nitro anisole |
| C. | 4-methoxy-6-nitrobenzaldehyde |
| D. | 2-formyl-5-methoxy nitrobenzene |
| Answer» B. 4-formyl-3-nitro anisole | |
| 7041. |
The Bohr orbit radius for the hydrogen atom \[(n=1)\] is approximately \[0.530{AA}\]. The radius for the first excited state \[(n=2)\] orbit is [CBSE PMT 1998; BHU 1999] |
| A. | \[0.13{AA}\] |
| B. | \[1.06{AA}\] |
| C. | \[4.77{AA}\] |
| D. | \[2.12{AA}\] |
| Answer» E. | |
| 7042. |
In standardization of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] using \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] by iodometry, the equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] is [IIT 2000] |
| A. | \[MW/2\] |
| B. | \[MW/3\] |
| C. | \[MW/6\] |
| D. | \[MW/1\] |
| Answer» D. \[MW/1\] | |
| 7043. |
Among the following species, identify the isostructural pairs, \[N{{F}_{3}},\,\,NO_{3}^{-},\,\,B{{F}_{3}},\,\,{{H}_{3}}{{O}^{+}},\,\,H{{N}_{3}}\] [IIT 1996] |
| A. | \[[N{{F}_{3}},\,\,NO_{3}^{-}]\] and \[[B{{F}_{3}},\,\,{{H}_{3}}{{O}^{+}}]\] |
| B. | \[[N{{F}_{3}},\,\,H{{N}_{3}}]\] and \[[NO_{3}^{-},\,\,B{{F}_{3}}]\] |
| C. | \[[N{{F}_{3}},\,\,{{H}_{3}}{{O}^{+}}]\] and \[[NO_{3}^{-},\,\,B{{F}_{3}}]\] |
| D. | \[[N{{F}_{3}},\,\,{{H}_{3}}{{O}^{+}}]\] and \[[H{{N}_{3}},\,\,B{{F}_{3}}]\] |
| Answer» D. \[[N{{F}_{3}},\,\,{{H}_{3}}{{O}^{+}}]\] and \[[H{{N}_{3}},\,\,B{{F}_{3}}]\] | |
| 7044. |
50 ml of hydrogen diffuses out through a small hole from a vessel in 20 minutes. The time needed for 40 ml of oxygen to diffuse out is [CBSE PMT 1994] |
| A. | 12 min |
| B. | 64 min |
| C. | 8 min |
| D. | 32 min |
| Answer» C. 8 min | |
| 7045. |
An aqueous solution of ammonium acetate is [NCERT 1980, 81; RPMT 1999] |
| A. | Faintly acidic |
| B. | Faintly basic |
| C. | Fairly acidic |
| D. | Almost neutral |
| Answer» E. | |
| 7046. |
Amongst the following identify the species with an atom in + 6 oxidation state [IIT Screening 2000] |
| A. | \[MnO_{4}^{-}\] |
| B. | \[Cr(CN)_{6}^{3-}\] |
| C. | \[NiF_{6}^{2-}\] |
| D. | \[Cr{{O}_{2}}C{{l}_{2}}\] |
| Answer» E. | |
| 7047. |
Concentrated aqueous sodium hydroxide can separate mixture of [MNR 1995] |
| A. | \[A{{l}^{3+}}\] and \[S{{n}^{2+}}\] |
| B. | \[A{{l}^{3+}}\] and \[F{{e}^{3+}}\] |
| C. | \[A{{l}^{3+}}\] and \[Z{{n}^{2+}}\] |
| D. | \[Z{{n}^{2+}}\] and \[P{{b}^{2+}}\] |
| Answer» C. \[A{{l}^{3+}}\] and \[Z{{n}^{2+}}\] | |
| 7048. |
What will be the order of Ist ionisation energy [BHU 2005] |
| A. | Li > Na > K |
| B. | K > Li > Na |
| C. | Na > Li > K |
| D. | Li > K > Na |
| Answer» B. K > Li > Na | |
| 7049. |
How many chiral isomers can be drawn from 2-bromo, 3-chloro butane [DCE 2003] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 7050. |
Propane cannot be prepared from which reaction [DCE 2003] |
| A. | \[C{{H}_{3}}-CH=C{{H}_{2}}\underset{O{{H}^{-}}}{\mathop{\xrightarrow{{{B}_{2}}{{H}_{6}}}}}\,\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}I\underset{P}{\mathop{\xrightarrow{HI}}}\,\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Cl\xrightarrow{Na}\] |
| D. | None of these |
| Answer» B. \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}I\underset{P}{\mathop{\xrightarrow{HI}}}\,\] | |