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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.
| 201. |
The number of isomers for the compound with molecular formula \[{{C}_{2}}BrClFI\]is [IIT-JEE (Screening) 2001] |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» E. | |
| 202. |
What is the concentration of nitrate ions if equal volumes of 0.1 M \[AgN{{O}_{3}}\] and 0.1 M NaCl are mixed together [NCERT 1981; CPMT 1983] |
| A. | 0.1 N |
| B. | 0.2 M |
| C. | 0.05 M |
| D. | 0.25 M |
| Answer» D. 0.25 M | |
| 203. |
A radioactive nucleus will not emit [DPMT 2005] |
| A. | Alpha and beta rays simultaneously |
| B. | Beta and gamma rays simultaneously |
| C. | Gamma and alpha rays |
| D. | Gamma rays only |
| Answer» E. | |
| 204. |
The number of possible enantiomeric pairs that can be produced during mono-chlorination of 2-methylbutane is [Pb. CET 2004] |
| A. | 3 |
| B. | 4 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 205. |
Which one of the following pairs represents stereoisomerism [CBSE PMT 2005] |
| A. | Chain isomerism and rotational isomerism |
| B. | Structural isomerism and geometric isomerism |
| C. | Linkage isomerism and geometric isomerism |
| D. | Optical isomerism and geometric isomerism |
| Answer» E. | |
| 206. |
The energy of a radiation of wavelength \[8000\,{AA}\] is \[{{E}_{1}}\]and energy of a radiation of wavelength \[16000\text{ }{AA}\]is \[{{E}_{2}}\]. What is the relation between these two [Kerala CET 2005] |
| A. | \[{{E}_{1}}=6{{E}_{2}}\] |
| B. | \[{{E}_{1}}=2{{E}_{2}}\] |
| C. | \[{{E}_{1}}=4{{E}_{2}}\] |
| D. | \[{{E}_{1}}=1/2{{E}_{2}}\] |
| E. | \[{{E}_{1}}={{E}_{2}}\] |
| Answer» C. \[{{E}_{1}}=4{{E}_{2}}\] | |
| 207. |
Which one of the following shows optical activity [NCERT 1984, 90] |
| A. | \[HO-\underset{H}{\mathop{\underset{|}{\mathop{\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-COOH\] |
| B. | \[C{{H}_{3}}-\underset{Cl}{\mathop{\underset{|}{\mathop{\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-COOH\] |
| C. | \[C{{H}_{3}}-\underset{OH\,\,}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,\,}{\mathop{C-\,}}\,}}\,}}\,}}\,COOH\] |
| D. | \[C{{H}_{3}}-\underset{Cl\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,\,\,}{\mathop{C-\,}}\,}}\,}}\,}}\,COOH\] |
| Answer» C. \[C{{H}_{3}}-\underset{OH\,\,}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,\,}{\mathop{C-\,}}\,}}\,}}\,}}\,COOH\] | |
| 208. |
Isomers have essentially identical [CBSE PMT 1988; MP PMT 1983, 86] |
| A. | Structural formula |
| B. | Chemical properties |
| C. | Molecular formula |
| D. | Physical properties |
| Answer» D. Physical properties | |
| 209. |
Nylon is not a [KCET 2004] |
| A. | Condensation polymer |
| B. | Polyamide |
| C. | Copolymer |
| D. | Homopolymer |
| Answer» E. | |
| 210. |
In the test of sulphate radical, the white precipitate of sulphate is soluble in |
| A. | Conc. \[HCl\] |
| B. | Conc. \[{{H}_{2}}S{{O}_{4}}\] |
| C. | Conc. \[HN{{O}_{3}}\] |
| D. | None of these |
| Answer» E. | |
| 211. |
In the reaction \[{{A}^{-{{n}_{2}}}}+x{{e}^{-}}\to {{A}^{-{{n}_{1}}}}\] Here \[x\] will be |
| A. | \[{{n}_{1}}+\text{ }{{n}_{2}}\] |
| B. | \[{{n}_{2}}-\text{ }{{n}_{1}}\] |
| C. | \[{{n}_{1}}-\text{ }{{n}_{2}}\] |
| D. | \[{{n}_{1}}.{{n}_{2}}\] |
| Answer» D. \[{{n}_{1}}.{{n}_{2}}\] | |
| 212. |
In a collection of H-atoms, all the electrons jump from n = 5 to ground level finally (directly or indirectly), without emitting any line in Balmer series. The number of possible different radiations is: |
| A. | 10 |
| B. | 8 |
| C. | 7 |
| D. | 6 |
| Answer» E. | |
| 213. |
Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in 35 g of chloroform. Molecular mass of anthracene is: (\[{{K}_{b}}\] for \[CHC{{l}_{3}}\]= 3.9 kg/mol ) |
| A. | 79.42 g/mol |
| B. | 132.32 g/mol |
| C. | 177.42 g/mol |
| D. | 242.32 g/mol |
| Answer» D. 242.32 g/mol | |
| 214. |
A solution saturated in lime water has a pH of 12.4. Then the Ksp for \[Ca{{(OH)}_{2}}\] is: |
| A. | \[3.2\times {{10}^{-3}}\] |
| B. | \[7.8\times {{10}^{-6}}\] |
| C. | \[7.8\times {{10}^{-28}}\] |
| D. | \[3.2\times {{10}^{-4}}\] |
| Answer» C. \[7.8\times {{10}^{-28}}\] | |
| 215. |
One mole of calcium phosphide on reaction with excess of water gives |
| A. | one mole of phosphine. |
| B. | two moles of phosphoric acid. |
| C. | two moles of phosphine. |
| D. | one mole of phosphorus oxide. |
| Answer» D. one mole of phosphorus oxide. | |
| 216. |
When dispersion medium is water, the colloidal system is called [MP PMT 1986] |
| A. | Sol |
| B. | Aerosol |
| C. | Organosol |
| D. | Aquasol |
| Answer» E. | |
| 217. |
The correct sequence of decrease in the bond angle of the following hybrides is [MP PET 2002] |
| A. | \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\] |
| B. | \[N{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}>Sb{{H}_{3}}\] |
| C. | \[Sb{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}>N{{H}_{3}}\] |
| D. | \[P{{H}_{3}}>N{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\] |
| Answer» B. \[N{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}>Sb{{H}_{3}}\] | |
| 218. |
The relative lowering of vapour pressure of aqueous solution containing a non-volatile solute is 0.0125. The molality of the solution is |
| A. | 0.7 |
| B. | 0.5 |
| C. | 0.8 |
| D. | 0.4 |
| Answer» B. 0.5 | |
| 219. |
The solution of sulphuric acid contains 80% by weight \[{{H}_{2}}S{{O}_{4}}\]. Specific gravity of this solution is 1.71. Its normality is about [CBSE 1991] |
| A. | 18.0 |
| B. | 27.9 |
| C. | 1.0 |
| D. | 10.0 |
| Answer» C. 1.0 | |
| 220. |
Phosphine is not obtained by which of the following reaction? |
| A. | White P is heated with\[NaOH\]. |
| B. | Red P is heated with\[NaOH\]. |
| C. | \[C{{a}_{3}}{{P}_{2}}\] reacts with water. |
| D. | Phosphorus trioxide is boiled with water. |
| Answer» C. \[C{{a}_{3}}{{P}_{2}}\] reacts with water. | |
| 221. |
Which one of the following compounds when heated with \[KOH\] and a primary amine gives carbylamines test [Orissa JEE 2005] |
| A. | \[CHC{{l}_{3}}\] |
| B. | \[C{{H}_{3}}Cl\] |
| C. | \[C{{H}_{3}}OH\] |
| D. | \[C{{H}_{3}}CN\] |
| Answer» B. \[C{{H}_{3}}Cl\] | |
| 222. |
The process, in which no heat enters or leaves the system, is termed as [Pb. PMT 1999; Kerala (Med.) 2002; J & K 2005] |
| A. | Isochoric |
| B. | Isobaric |
| C. | Isothermal |
| D. | Adiabatic |
| Answer» E. | |
| 223. |
The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders? |
| A. | \[CsH>RbH>KH>NaH>LiH\] |
| B. | \[KH>NaH>LiH>CsH>RbH\] |
| C. | \[NaH>LiH>KH>RbH>CsH\] |
| D. | \[LiH>NaH>KH>RbH>CsH\] |
| Answer» E. | |
| 224. |
Which of the following compounds is optically active [Pb. PMT 2001; AMU 2002; Kerala (Med.) 2003] |
| A. | \[{{(C{{H}_{3}})}_{2}}CHC{{H}_{2}}OH\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| C. | \[CC{{l}_{2}}{{F}_{2}}\] |
| D. | \[C{{H}_{3}}CHOH{{C}_{2}}{{H}_{5}}\] |
| Answer» E. | |
| 225. |
What is the possible number of optical isomers for a compound containing 2-dissimilar asymmetric carbon atom [CPMT 1999; UPSEAT 1999, 2000, 02] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 226. |
In presence of air, fermentation of ethyl alcohol by azotobactor bacteria forms [MP PMT 1989] |
| A. | \[C{{H}_{2}}=C{{H}_{2}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[C{{H}_{3}}CHO\] |
| D. | \[C{{H}_{3}}COOH\] |
| Answer» E. | |
| 227. |
Which of the following radicals will not be precipitated by passing \[{{H}_{2}}S\] in concentrated acid solution [BHU 1986] |
| A. | Copper |
| B. | Antimony |
| C. | Arsenic |
| D. | Cadmium |
| Answer» E. | |
| 228. |
\[\underset{\text{(anode)}\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{Z{{n}_{(s)}}|Z{{n}^{2+}}_{(aq)}|}}\,|\underset{\text{(cathode)}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{u}^{2+}}_{(aq)}|C{{u}_{(s)}}}}\,\]is [Kerala (Engg.) 2002] |
| A. | Weston cell |
| B. | Daniel cell |
| C. | Calomel cell |
| D. | Faraday cell |
| E. | Standard cell |
| Answer» C. Calomel cell | |
| 229. |
Pure \[NaCl\]is prepared by saturating a cold saturated solution of common salt in water with \[HCl\] gas. The principle used is [AFMC 1992] |
| A. | Le Chatelier principle |
| B. | Displacement law |
| C. | Common ion effect |
| D. | Fractional distillation |
| Answer» D. Fractional distillation | |
| 230. |
The radius of electron in the first excited state of hydrogen atom is [MP PMT 2004] |
| A. | \[{{a}_{0}}\] |
| B. | \[4{{a}_{0}}\] |
| C. | \[2{{a}_{0}}\] |
| D. | \[8{{a}_{0}}\] |
| Answer» C. \[2{{a}_{0}}\] | |
| 231. |
\[6\times {{10}^{-3}}\] mole \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] reacts completely with \[9\times {{10}^{-3}}\] mole of \[{{x}^{n+}}\] to give \[XO_{3}^{-}\] and \[C{{r}^{3+}}\]. Value of n will be |
| A. | 1 |
| B. | 3 |
| C. | 2 |
| D. | 4 |
| Answer» B. 3 | |
| 232. |
Which kind of isomerism is possible for 1-chloro-2-nitroethene [J & K 2005] |
| A. | Functional group isomerism |
| B. | Position isomerism |
| C. | \[E/Z\] isomerism |
| D. | Optical isomerism |
| Answer» D. Optical isomerism | |
| 233. |
Which will give chiral molecule [DPMT 2005] |
| A. | \[C{{H}_{3}}COCl\xrightarrow{LiAl{{H}_{4}}}\] |
| B. | \[{{C}_{2}}{{H}_{5}}CHO\underset{{{H}^{+}}/{{H}_{2}}O}{\mathop{\xrightarrow{C{{H}_{3}}MgBr}}}\,\] |
| C. | \[{{(C{{H}_{3}})}_{2}}CH{{C}_{2}}{{H}_{5}}\xrightarrow{Cu}\] |
| D. | \[\begin{matrix} H \\ {} \\ C{{H}_{3}} \\ \end{matrix}\,\,\,\,\,\,C=C\,\,\,\,\,\,\,\,\begin{matrix} C{{H}_{3}} \\ {} \\ C{{H}_{3}} \\ \end{matrix}\xrightarrow{C{{l}_{2}}}\] |
| Answer» C. \[{{(C{{H}_{3}})}_{2}}CH{{C}_{2}}{{H}_{5}}\xrightarrow{Cu}\] | |
| 234. |
What is not true about polymers [MP PET 1999] |
| A. | Polymers do not carry any charge |
| B. | Polymers have high viscosity |
| C. | Polymers scatter light |
| D. | Polymers have low molecular weight |
| Answer» E. | |
| 235. |
Chlorophyll, the green colouring matter of plants responsible for photosynthesis, contains 2.68% of magnesium by mass. Calculate the number of magnesium atoms in 2.00g of chlorophyll. |
| A. | \[1.345\times {{10}^{21}}\] |
| B. | \[1.345\times {{10}^{20}}\] |
| C. | \[13.45\times {{10}^{21}}\] |
| D. | \[1.345\times {{10}^{23}}\] |
| Answer» B. \[1.345\times {{10}^{20}}\] | |
| 236. |
Among the given statements, the incorrect one is |
| A. | \[Be\] differs much from other alkali metals than \[Li\] does from other alkali metals. |
| B. | \[Be\] generally forms covalent compounds |
| C. | \[Be\] forms a very strong complex \[{{[Be{{({{H}_{2}}O)}_{4}}]}^{2+}}\]. |
| D. | \[Be\] usually has more than four water of crystallisation associated with it. |
| Answer» E. | |
| 237. |
Al is more reactive than Fe but Al is less easily corroded than Fe because |
| A. | it is a noble metal |
| B. | oxygen forms a protective oxide layer |
| C. | iron undergoes reaction easily with water |
| D. | Fe form mono and divalent ions. |
| Answer» C. iron undergoes reaction easily with water | |
| 238. |
Nylon ? 66 is [RPMT 2003] |
| A. | \[{{\left( -\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-{{(C{{H}_{2}})}_{4}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-NH-{{(C{{H}_{2}})}_{6}}-NH- \right)}_{n}}\] |
| B. | \[\left( -NH-{{(C{{H}_{2}})}_{5}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,- \right)\] |
| C. | \[{{\left( \underset{\,\,\,\,\,\,\,\,\,\,COOMe}{\overset{\,\,\,\,C{{H}_{3}}}{\mathop{C{{H}_{2}}-\underset{|}{\overset{|}{\mathop{C}}}\,-\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}}\, \right)}_{n}}\] |
| D. | \[{{\left[ -\begin{array}{*{35}{l}} F \\ \underset{|}{\overset{|}{\mathop{C}}}\,\,- \\ F \\ \end{array}\begin{array}{*{35}{l}} F \\ \underset{|}{\overset{|}{\mathop{C}}}\,\,- \\ F \\ \end{array} \right]}_{n}}\] |
| Answer» B. \[\left( -NH-{{(C{{H}_{2}})}_{5}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,- \right)\] | |
| 239. |
3 and 6 electrons are present in the outermost orbit of A and B respectively. The chemical formula of its compound will be |
| A. | \[{{A}_{3}}{{B}_{2}}\] |
| B. | \[{{A}_{2}}{{B}_{3}}\] |
| C. | \[{{A}_{2}}B\] |
| D. | \[AB\] |
| Answer» C. \[{{A}_{2}}B\] | |
| 240. |
The valency shell of calcium contains [JIPMER 2000] |
| A. | 8 electrons |
| B. | 6 electrons |
| C. | 4 electrons |
| D. | 2 electrons |
| Answer» E. | |
| 241. |
Which of the following halogens doesn?t exhibit positive oxidation state in its compounds [MH CET 1999] |
| A. | Cl |
| B. | Br |
| C. | I |
| D. | F |
| Answer» E. | |
| 242. |
The pH of solution, containing 0.1 N HCI and \[0.1\,N\,C{{H}_{3}}COOH\,({{K}_{a}}=2\times {{10}^{-5}})\] is |
| A. | 1 |
| B. | 0.7 |
| C. | 3 |
| D. | 1.3 |
| Answer» E. | |
| 243. |
Select the best indicator from the given table for titration of 20 mL of \[0.02\,M\,\,C{{H}_{3}}COOH\] with 0.02 M NaOH. Given \[p{{K}_{a}}\,(C{{H}_{3}}COOH)=4.74\] Indicator pH Range (I) Bromothy mol blue 6.0-7.6 (II) Thymolphthalein 9.3-11.05 (III) Malachite green 11.4-13 (IV) M-Cresol purple 7.4-9.0 |
| A. | I |
| B. | II |
| C. | III |
| D. | IV |
| Answer» E. | |
| 244. |
The vapour pressure curves of the same solute in the same solvent are shown. The curves are parallel to each other and do not intersect. The concentrations of solutions are in order of: |
| A. | I < II < III |
| B. | I = II = III |
| C. | I > II >III |
| D. | I > III > II |
| Answer» B. I = II = III | |
| 245. |
Concentrated \[HN{{O}_{3}}\] is 63% \[HN{{O}_{3}}\] by mass and has a density of 1.4 g/mL. How many millilitres of this solution are required to prepare 250 mL of a 1.20 M \[HN{{O}_{3}}\] solution? |
| A. | 18 |
| B. | 21.42 |
| C. | 20 |
| D. | 14.21 |
| Answer» C. 20 | |
| 246. |
Osmosis result from |
| A. | Increase in entropy in semi permeable |
| B. | decrease in entropy in less diluted solution |
| C. | decrease in internal energy of less diluted solution |
| D. | decrease in entropy of more diluted solution. |
| Answer» E. | |
| 247. |
Anhydrous aluminium chloride \[(A{{l}_{2}}C{{l}_{6}})\] is covalent compound and soluble in water giving: |
| A. | \[A{{l}^{3+}}\] and \[C{{l}^{-}}\]ions |
| B. | \[{{[Al{{({{H}_{2}}O)}_{6}}]}^{3+}}\] and \[C{{l}^{-}}\] ions |
| C. | \[{{[AlC{{l}_{2}}{{({{H}_{2}}O)}_{4}}]}^{3+}}\] and \[{{[AlC{{l}_{4}}{{({{H}_{2}}O)}_{2}}]}^{-}}\] ions |
| D. | none of the above |
| Answer» D. none of the above | |
| 248. |
According to Bohr's theory the energy required for the transition of H-atom from\[~n=6\text{ }to\text{ }n=8\] state is |
| A. | equal to the energy required for the transition from \[n=5\text{ }to\text{ }n=6\]state |
| B. | larger than in [a] |
| C. | less than in [a] |
| D. | equal to the energy required for the transition from \[n=7\text{ }to\text{ }n=9\]state. |
| Answer» D. equal to the energy required for the transition from \[n=7\text{ }to\text{ }n=9\]state. | |
| 249. |
Match List-I with List-II and select the correct answer using the code given below the lists:List-IList-ISub-atomic particlesPersons responsible for discovery(A) Electron (p) James Chadwick(B) Proton (q) J.J. Thomson(C) Neutron(r) Rutherford(D) Nucleus(s) GoldsteinCodes: |
| A. | A\[\to \]q, B\[\to \]s, C\[\to \]r, D\[\to \]p |
| B. | A\[\to \]p, B\[\to \]p, C\[\to \]q, D\[\to \]s |
| C. | A\[\to \]r, B\[\to \]s, C\[\to \]p, D\[\to \]q |
| D. | A\[\to \]q, B\[\to \]s, C\[\to \]p, D\[\to \]r |
| Answer» E. | |
| 250. |
The following transition occurs when Lithium atoms are sprayed into hot flame. The various steps are numbered for identification. \[2s\xrightarrow{I}2p\xrightarrow{II}3d\xrightarrow{III}3p\xrightarrow{IV}\]\[4s\xrightarrow{V}3p\] Which of these transitions result in emission of light? |
| A. | I, II & V |
| B. | III & V |
| C. | III, IV & V |
| D. | All |
| Answer» C. III, IV & V | |