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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.
| 9451. |
When little vanadium is mixed with steel, it becomes |
| A. | More hard |
| B. | More tensility |
| C. | Both a and b |
| D. | No effect |
| Answer» D. No effect | |
| 9452. |
An element have atomic weight 40 and it?s electronic configuration is \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}.\] Then its atomic number and number of neutrons will be [RPMT 2002] |
| A. | 18 and 22 |
| B. | 22 and 18 |
| C. | 26 and 20 |
| D. | 40 and 18 |
| Answer» B. 22 and 18 | |
| 9453. |
The solubility of \[S{{b}_{2}}{{S}_{3}}\]in water is \[1.0\times {{10}^{-5}}\]mol / litre at 298 K. What will be its solubility product [CPMT 2004] |
| A. | \[108\times {{10}^{-25}}\] |
| B. | \[1.0\times {{10}^{-25}}\] |
| C. | \[144\times {{10}^{-25}}\] |
| D. | \[126\times {{10}^{-24}}\] |
| Answer» B. \[1.0\times {{10}^{-25}}\] | |
| 9454. |
Which of the following does not have a metal carbon bond [CBSE PMT 2004] |
| A. | \[K[Pt({{C}_{2}}{{H}_{4}})C{{l}_{3}}]\] |
| B. | \[Ni{{(CO)}_{4}}\] |
| C. | \[Al{{(O{{C}_{2}}{{H}_{5}})}_{3}}\] |
| D. | \[{{C}_{2}}{{H}_{5}}MgBr\] |
| Answer» D. \[{{C}_{2}}{{H}_{5}}MgBr\] | |
| 9455. |
\[\alpha -D-\]glucose and \[\beta -D-\]glucose differ from each other due to difference in one of the carbons with respect to its [CBSE PMT 1995; AFMC 1999] |
| A. | Size of hemiacetal ring |
| B. | Number of OH groups |
| C. | Configuration |
| D. | Conformation |
| Answer» D. Conformation | |
| 9456. |
The transition metal used as a catalyst is [Pb. PMT 2004] |
| A. | Nickel |
| B. | Platinum |
| C. | Cobalt |
| D. | All of these |
| Answer» E. | |
| 9457. |
Lyophilic sols are more stable than lyophobic sols because their particles are [Karala CET 2005] |
| A. | Positively charged |
| B. | Negatively charged |
| C. | All soluble |
| D. | Attract each other |
| E. | Are heavier |
| Answer» D. Attract each other | |
| 9458. |
An ore of tin containing \[FeCr{{O}_{4}}\] is concentrated by [SCRA 1991] |
| A. | Magnetic separation |
| B. | Froth floatation |
| C. | Electrostatic method |
| D. | Gravity separation |
| Answer» B. Froth floatation | |
| 9459. |
In the preparation of Grignard reagent from haloalkane, the metal [RPET 1999] |
| A. | Mg |
| B. | Zn |
| C. | Li |
| D. | K |
| Answer» B. Zn | |
| 9460. |
Ethylidine dichloride can be prepared by the reaction of HCl and [MH CET 1999] |
| A. | \[{{C}_{2}}{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{2}}\] |
| C. | \[{{C}_{2}}{{H}_{5}}\] |
| D. | All of these |
| Answer» C. \[{{C}_{2}}{{H}_{5}}\] | |
| 9461. |
Which is most acidic of the following [J & K 2005] |
| A. | Methane |
| B. | Acetylene |
| C. | 1-butene |
| D. | Neo-pentane |
| Answer» C. 1-butene | |
| 9462. |
A hydrocarbon has C=85.72% and remaining H. The hydrocarbon is [MP PET 1996] |
| A. | \[{{C}_{2}}{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[{{C}_{2}}{{H}_{2}}\] |
| D. | \[C{{H}_{4}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{6}}\] | |
| 9463. |
The C - H bond length is minimum in the bond formed by |
| A. | sp - s overlapping (as in alkynes) |
| B. | \[s{{p}^{2}}-s\] overlapping (as in alkenes) |
| C. | \[s{{p}^{3}}-s\] overlapping (as in alkanes) |
| D. | None of these |
| Answer» B. \[s{{p}^{2}}-s\] overlapping (as in alkenes) | |
| 9464. |
IUPAC name of \[C{{H}_{3}}-\underset{C{{H}_{2}}C{{H}_{3}}\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-CHO}}\,}}\,\] is [IIT-JEE 1993] |
| A. | Butan-2-aldehyde |
| B. | 2-methylbutanal |
| C. | 3-methyl isobutyraldehyde |
| D. | 2-ethylpropanal |
| Answer» C. 3-methyl isobutyraldehyde | |
| 9465. |
Chloride ion and potassium ion are isoelectronic. Then [KCET 2002] |
| A. | Potassium ion is relatively bigger |
| B. | Depends on the other cation and anion |
| C. | Their size are same |
| D. | Chloride ion is bigger than potassium ion |
| Answer» E. | |
| 9466. |
The ionic radii of \[L{{i}^{+}},N{{a}^{+}},{{K}^{+}}\]are in which of the following order [MP PMT 2002] |
| A. | \[{{K}^{+}}>N{{a}^{+}}>L{{i}^{+}}\] |
| B. | \[{{K}^{+}}>N{{a}^{+}}<L{{i}^{+}}\] |
| C. | \[{{K}^{+}}<N{{a}^{+}}<L{{i}^{+}}\] |
| D. | \[L{{i}^{+}}>N{{a}^{+}}<{{K}^{+}}\] |
| Answer» B. \[{{K}^{+}}>N{{a}^{+}}<L{{i}^{+}}\] | |
| 9467. |
Which of the following has the largest ionic radius [Pb. PMT 2002; BHU 2003] |
| A. | \[N{{a}^{+}}\] |
| B. | \[N{{i}^{+}}\] |
| C. | \[C{{s}^{+}}\] |
| D. | \[M{{g}^{+2}}\] |
| Answer» D. \[M{{g}^{+2}}\] | |
| 9468. |
A radioactive isotope has a half-life of 20 days. If 100 gm of the substance is taken, the weight of the isotope remaining after 40 days is [NCERT 1979] |
| A. | 25 gm |
| B. | 2.5 gm |
| C. | 60 gm |
| D. | 40 gm |
| Answer» B. 2.5 gm | |
| 9469. |
Blood sugar is the same as [DPMT 2000] |
| A. | Glucose |
| B. | Galactose |
| C. | Glycogen |
| D. | Fructose |
| Answer» B. Galactose | |
| 9470. |
Which one of the following is not a colloid [BIT 1992] |
| A. | Milk |
| B. | Blood |
| C. | Solution of urea |
| D. | Ice cream |
| Answer» D. Ice cream | |
| 9471. |
Which of the following \[0.10\,m\] aqueous solution will have the lowest freezing point [CBSE PMT 1997] |
| A. | \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] |
| B. | \[{{C}_{5}}{{H}_{10}}{{O}_{5}}\] |
| C. | \[KI\] |
| D. | \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\] |
| Answer» B. \[{{C}_{5}}{{H}_{10}}{{O}_{5}}\] | |
| 9472. |
A negatively charged suspension of clay in water will need for precipitation the minimum amount of [CPMT 1973] |
| A. | Aluminium chloride |
| B. | Potassium sulphate |
| C. | Sodium hydroxide |
| D. | Hydrochloric acid |
| Answer» B. Potassium sulphate | |
| 9473. |
Amongst the following the most basic compound is [AIEEE 2005] |
| A. | Benzylamine |
| B. | Aniline |
| C. | Acetanilide |
| D. | p-nitroaniline |
| Answer» B. Aniline | |
| 9474. |
To neutralise 20 ml of \[M/10\] sodium hydroxide, the volume of \[M/20\] hydrochloric acid required is [Andhra MBBS 1980] |
| A. | 10 ml |
| B. | 15 ml |
| C. | 20 ml |
| D. | 40 ml |
| Answer» E. | |
| 9475. |
Element showing the phenomenon of allotropy is [MP PMT 1999] |
| A. | Aluminium |
| B. | Tin |
| C. | Lead |
| D. | Copper |
| Answer» C. Lead | |
| 9476. |
What will be the IUPAC name of the given compound \[\underset{\underset{\,C{{H}_{2}}-C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{\overset{\overset{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{2}}-C{{H}_{3}}}{\mathop{\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}}\,}{\mathop{C{{H}_{3}}-CH-CH-C{{H}_{2}}-CH-C{{H}_{3}}}}\,}}\,\] [BHU 2005] |
| A. | 2, 5 - diethyl - 4 - methylexane |
| B. | 3, 4, 6 - trimethyloctane |
| C. | 2, 5, 6 - trimethyloctane |
| D. | 3, 5 - dimethyl - 6 - ehtylheptane |
| Answer» C. 2, 5, 6 - trimethyloctane | |
| 9477. |
The IUPAC name for \[C{{H}_{3}}CO-C{{H}_{3}}\] is [J & K 2005] |
| A. | Dimethyl ketone |
| B. | Acetone |
| C. | Propanal |
| D. | Propanone |
| Answer» E. | |
| 9478. |
\[{{H}_{3}}C-\underset{Cl\,\,}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{C=}}\,}}\,CH-\underset{C{{H}_{3}}\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{3}}\] [KCET 2005] |
| A. | 2-chloro-4-methyl-2-pentene |
| B. | 4-chloro-2-methyl-3-pentene |
| C. | 4-methyl-2-chloro-2-pentene |
| D. | 2-chloro-4, 4-dimethyl-2-butene |
| Answer» B. 4-chloro-2-methyl-3-pentene | |
| 9479. |
For the reaction \[C{{H}_{3}}-CH=C{{H}_{2}}+HOCl\to A\] the product A is [Orissa JEE 2002] |
| A. | \[C{{H}_{3}}-CHCl-C{{H}_{2}}OH\] |
| B. | \[C{{H}_{3}}-\underset{OH}{\mathop{\underset{\,|\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{2}}-Cl\] |
| C. | \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-COCl\] |
| D. | \[C{{H}_{3}}-\underset{\,OH\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{\overset{\,\,Cl\,\,\,\,}{\mathop{\overset{|}{\mathop{C}}\,\,\,-}}\,}}\,}}\,C{{H}_{3}}\] |
| Answer» C. \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-COCl\] | |
| 9480. |
Cyclohexene on reaction with \[Os{{O}_{4}}\] followed by reaction with \[NaHS{{O}_{3}}\] gives [Orissa JEE 2005] |
| A. | cis-diol |
| B. | trans-diol |
| C. | epoxy |
| D. | alcohol |
| Answer» B. trans-diol | |
| 9481. |
Aqueous sulphuric acid reacts with 2-methyl-1-butene to give predominantly [Roorkee 1992] |
| A. | Isobutyl hydrogen sulphate |
| B. | 2-methyl-2-butanol |
| C. | 2-methyl-1-butanol |
| D. | Secondary butyl hydrogen sulphate |
| Answer» C. 2-methyl-1-butanol | |
| 9482. |
Which of the following hydrocarbons cannot be obtained by Sabatier and Senderen's reaction |
| A. | \[C{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[{{C}_{3}}{{H}_{8}}\] |
| D. | All |
| Answer» B. \[{{C}_{2}}{{H}_{6}}\] | |
| 9483. |
Hybridization of \[[Ni{{(CO)}_{4}}]\] is [Pb. CET 2000] |
| A. | \[s{{p}^{3}}\] |
| B. | \[{{d}^{2}}s{{p}^{3}}\] |
| C. | \[s{{p}^{3}}d\] |
| D. | \[s{{p}^{2}}\] |
| Answer» B. \[{{d}^{2}}s{{p}^{3}}\] | |
| 9484. |
Which property of an element is always a whole number [MP PMT 1986] |
| A. | Atomic weight |
| B. | Equivalent weight |
| C. | Atomic number |
| D. | Atomic volume |
| Answer» D. Atomic volume | |
| 9485. |
\[12g\]of \[Mg\](at. mass 24) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be [CPMT 1978] |
| A. | \[22.4\ L\] |
| B. | \[11.2\ L\] |
| C. | \[44.8\ L\] |
| D. | \[6.1\ L\] |
| Answer» C. \[44.8\ L\] | |
| 9486. |
Which is not example of Bronsted Lowry theory [AIEEE 2003] |
| A. | \[AlC{{l}_{3}}\] |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[S{{O}_{2}}\] |
| D. | \[HN{{O}_{3}}\] |
| Answer» D. \[HN{{O}_{3}}\] | |
| 9487. |
\[Cr{{O}_{3}}\] dissolves in aqueous \[NaOH\] to give [J & K 2005] |
| A. | \[CrO_{4}^{2-}\] |
| B. | \[Cr(OH)_{3}^{-}\] |
| C. | \[C{{r}_{2}}O_{7}^{2-}\] |
| D. | \[Cr{{(OH)}_{2}}\] |
| Answer» B. \[Cr(OH)_{3}^{-}\] | |
| 9488. |
Adding of \[C{{l}_{2}}\] to benzene in the presence of \[AlC{{l}_{3}}\] is an example of [Bihar MEE 1996] |
| A. | Addition |
| B. | Halogenation |
| C. | Substitution |
| D. | Elimination |
| E. | None of these |
| Answer» D. Elimination | |
| 9489. |
The charge on the atom containing 17 protons, 18 neutrons and 18 electrons is [AIIMS 1996] |
| A. | \[+1\] |
| B. | \[-2\] |
| C. | \[-1\] |
| D. | Zero |
| Answer» D. Zero | |
| 9490. |
The colour of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] changes from red orange to lemon yellow on treatment with aqueous \[KOH\] because of [MP PMT 1994] |
| A. | The reduction of \[C{{r}^{VI}}\] to \[C{{r}^{III}}\] |
| B. | The formation of chromium hydroxide |
| C. | The conversion of dichromate to chromate |
| D. | The oxidation of potassium hydroxide to potassium peroxide |
| Answer» D. The oxidation of potassium hydroxide to potassium peroxide | |
| 9491. |
Acetic acid dissolved in benzene shows a molecular weight of [MP PET 1993, 02] |
| A. | 60 |
| B. | 120 |
| C. | 180 |
| D. | 240 |
| Answer» C. 180 | |
| 9492. |
Potassium nitrate is called [RPMT 1999] |
| A. | Mohr's salt |
| B. | Gypsum |
| C. | Indian salt petre |
| D. | Chile salt petre |
| Answer» D. Chile salt petre | |
| 9493. |
The word 'alkali' is used for alkali metals indicates [RPMT 1999] |
| A. | Ash of the plants |
| B. | Metallic nature |
| C. | Silvery lusture |
| D. | Active metal |
| Answer» B. Metallic nature | |
| 9494. |
In the Ostwald's process for the manufacture of \[HN{{O}_{3}}\], the catalyst used is [AMU 1982, 83; MP PET 1999] |
| A. | \[Mo\] |
| B. | \[Fe\] |
| C. | \[Ni\] |
| D. | \[Pt\] |
| Answer» E. | |
| 9495. |
The IUPAC name of \[C{{H}_{3}}CH(C{{H}_{3}})COOH\] is [CPMT 1988; RPMT 2000] |
| A. | Dimethyl acetic acid |
| B. | 2-methyl propanoic acid |
| C. | Propanoic acid |
| D. | Butyric acid |
| Answer» C. Propanoic acid | |
| 9496. |
Alkene can be prepared from alkyl halide by the following reagent \[R-X+N{{u}^{-}}\to \text{Alkene}+NuH\] [RPET 2000] |
| A. | Alc. KOH + heat |
| B. | Aq. KOH + cold water |
| C. | NaOH |
| D. | LiOH |
| Answer» B. Aq. KOH + cold water | |
| 9497. |
The reaction \[_{1}{{H}^{2}}+{{\,}_{1}}{{H}^{3}}\to {{\,}_{2}}H{{e}^{4}}+{{\,}_{0}}{{n}^{1}}+\]energy represents [MP PMT 1990; CPMT 1990; KCET 1992] |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Artificial disintegration |
| D. | Transmutation of element |
| Answer» C. Artificial disintegration | |
| 9498. |
A gas decolourises Bayer's reagent but does not react with Tollen's reagent, this gas is [MP PMT 2001] |
| A. | Ethene |
| B. | Ethyne |
| C. | Ethane |
| D. | Methane |
| Answer» B. Ethyne | |
| 9499. |
Mg burns in CO to produce [Pb.PMT 2001] |
| A. | \[Mg{{O}_{2}}\] |
| B. | \[MgC{{O}_{3}}\] |
| C. | \[MgO+CO\] |
| D. | \[MgO+C\] |
| Answer» E. | |
| 9500. |
\[MgC{{l}_{2}}.6{{H}_{2}}O\]. When heated gives [MHCET 2003] |
| A. | Magnesium oxide |
| B. | Magnesium oxychloride |
| C. | Magnesium dichloride |
| D. | Magnesium chloride |
| Answer» D. Magnesium chloride | |