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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.
| 9801. |
An organic compound has C = 60%, H = 13.3% and O = 26.7%. Its empirical formula will be |
| A. | \[{{C}_{3}}{{H}_{6}}O\] |
| B. | \[{{C}_{2}}{{H}_{6}}{{O}_{2}}\] |
| C. | \[{{C}_{4}}{{H}_{8}}{{O}_{2}}\] |
| D. | \[{{C}_{3}}{{H}_{8}}O\] |
| Answer» E. | |
| 9802. |
On analysis, a saturated hydrocarbon is found to contain 83.70 percent carbon and 16.30% hydrogen. The empirical formula will be (at. wt. of C=12, at. wt. of H = 1) [MP PMT 1995] |
| A. | \[{{C}_{3}}{{H}_{6}}\] |
| B. | \[{{C}_{3}}{{H}_{8}}\] |
| C. | \[{{C}_{3}}{{H}_{7}}\] |
| D. | \[{{C}_{6}}{{H}_{12}}\] |
| Answer» D. \[{{C}_{6}}{{H}_{12}}\] | |
| 9803. |
Salt cake is |
| A. | Sodium sulphate |
| B. | Sodium chloride |
| C. | Sodium bisulphite |
| D. | Sodium sulphate and Sodium chloride |
| Answer» B. Sodium chloride | |
| 9804. |
In an isochoric process the increase in internal energy is [MP PMT 1997] |
| A. | Equal to the heat absorbed |
| B. | Equal to the heat evolved |
| C. | Equal to the work done |
| D. | Equal to the sum of the heat absorbed and work done |
| Answer» B. Equal to the heat evolved | |
| 9805. |
A salt \['X'\] is dissolved in water \[(pH=7),\] the resulting solution becomes alkaline in nature. The salt is made of [CPMT 1983] |
| A. | A strong acid and strong base |
| B. | A strong acid and weak base |
| C. | A weak acid and weak base |
| D. | A weak acid and strong base |
| Answer» E. | |
| 9806. |
Tritium is the isotope of [CPMT 2003] |
| A. | Hydrogen |
| B. | Oxygen |
| C. | Carbon |
| D. | Sulpher |
| Answer» B. Oxygen | |
| 9807. |
Which element is estimated by Carius method |
| A. | Carbon |
| B. | Hydrogen |
| C. | Halogen |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
| 9808. |
Insulin contains 3.4% sulphur. The minimum molecular weight of insulin is [MP PET 1993] |
| A. | 350 |
| B. | 470 |
| C. | 560 |
| D. | 940 |
| Answer» E. | |
| 9809. |
What is the co-ordination number of cobalt in \[Co{{(N{{H}_{3}})}_{3}}C{{l}_{3}}\] [MP PET 1994] |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» E. | |
| 9810. |
Ethyne on reaction with dil. \[{{H}_{2}}S{{O}_{4}}\] and \[Hg(\text{II})\] gives |
| A. | Ethanol |
| B. | Ethanal |
| C. | Methoxymethane |
| D. | Ethyl hydrogen sulphate |
| Answer» C. Methoxymethane | |
| 9811. |
An engine operating between \[{{150}^{o}}C\] and \[{{25}^{o}}C\] takes 500 J heat from a higher temperature reservoir if there are no frictional losses, then work done by engine is [MH CET 1999] |
| A. | 147.7 J |
| B. | 157.75 J |
| C. | 165.85 J |
| D. | 169.95 J |
| Answer» B. 157.75 J | |
| 9812. |
The solubility product of silver sulphide is \[3.2\times {{10}^{-11}}.\]Its solubility at the experimental temperature is |
| A. | \[2\times {{10}^{-4}}\]moles per litre |
| B. | \[6\times {{10}^{-6}}\]moles per litre |
| C. | \[1.2\times {{10}^{-5}}\]moles per litre |
| D. | \[8\times {{10}^{-4}}\]moles per litre |
| Answer» B. \[6\times {{10}^{-6}}\]moles per litre | |
| 9813. |
A precipitate is changed to colloidal solution by the following process [UPSEAT 2004] |
| A. | Dialysis |
| B. | Ultrafiltration |
| C. | Peptization |
| D. | Electrophoresis |
| Answer» D. Electrophoresis | |
| 9814. |
Propionic acid is subjected to reduction with hydroiodic acid in the presence of a little P, the product formed is [JIPMER 1997] |
| A. | Ethane |
| B. | Propane |
| C. | Butane |
| D. | None of these |
| Answer» C. Butane | |
| 9815. |
IUPAC name of the compound is \[C{{H}_{3}}-CH=\underset{C{{H}_{2}}-C{{H}_{2}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C-C{{H}_{3}}}}\,}}\,\] [NCERT 1983; MP PMT 1989, 96; BHU 1997] |
| A. | 2-ethyl-2-butene |
| B. | 3-ethyl-2-butene |
| C. | 3-Methyl-3-pentene |
| D. | 3-methyl-2-pentene |
| Answer» E. | |
| 9816. |
For the reaction in aqueous solution \[Z{{n}^{2+}}+{{X}^{-}}\]⇄ \[Zn{{X}^{+}},\] the \[{{K}_{eq}}\] is greatest when \[X\]is [Pb. PMT 1998] |
| A. | \[{{F}^{-}}\] |
| B. | \[NO_{3}^{-}\] |
| C. | \[ClO_{4}^{-}\] |
| D. | \[{{I}^{-}}\] |
| Answer» B. \[NO_{3}^{-}\] | |
| 9817. |
IUPAC name for the compounds [DPMT 2004] |
| A. | a-Methyl cyclohexanone |
| B. | 2-Methyl cyclohexanone |
| C. | Heptanone-2 |
| D. | Methyl cyclo-hexanone |
| Answer» C. Heptanone-2 | |
| 9818. |
The disintegration of an isotope of sodium. \[_{11}N{{a}^{24}}{{\to }_{12}}M{{g}^{24}}{{+}_{-1}}{{e}^{0}}\] shown is due to [AMU (Engg.) 2000] |
| A. | The emission of b-radiation |
| B. | The formation of a stable nuclide |
| C. | The fall in the neutron : proton ratio |
| D. | None of these |
| Answer» B. The formation of a stable nuclide | |
| 9819. |
The IUPAC name of \[C{{H}_{3}}C{{H}_{2}}C(Br)=CH-Cl\] is [CPMT 2004] |
| A. | 2-bromo-1-chloro butane |
| B. | 1-chloro-2-bromo-butene |
| C. | 3-chloro-2-bromo butene-2 |
| D. | None of these |
| Answer» B. 1-chloro-2-bromo-butene | |
| 9820. |
An atom has the electronic configuration of \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\], \[3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{5}}\]. Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be [MP PMT 1987] |
| A. | 35 and 45 |
| B. | 45 and 35 |
| C. | 40 and 40 |
| D. | 30 and 50 |
| Answer» B. 45 and 35 | |
| 9821. |
Which of the following imparts green colour to the glass [CPMT 1993] |
| A. | \[C{{u}_{2}}O\] |
| B. | \[CdS\] |
| C. | \[Mn{{O}_{2}}\] |
| D. | \[C{{r}_{2}}{{O}_{3}}\] |
| Answer» E. | |
| 9822. |
The charring of sugar, when treated with conc. \[{{H}_{2}}S{{O}_{4}},\] is due to [Pb. CET 2002] |
| A. | Oxidation |
| B. | Reduction |
| C. | Dehydration |
| D. | Hydrolysis |
| Answer» D. Hydrolysis | |
| 9823. |
Which of these does not follow Anti-Markownikoff's rule [Orissa JEE 2005] |
| A. | 2-butene |
| B. | 1-butene |
| C. | 2-pentene |
| D. | 2-hexene |
| Answer» B. 1-butene | |
| 9824. |
The correct structure of benzene was proposed by [CPMT 1972] |
| A. | Faraday |
| B. | Davy |
| C. | Kekule |
| D. | Wohler |
| Answer» D. Wohler | |
| 9825. |
When a neutral atom is converted into cation, there is [EAMCET 1986] |
| A. | Decrease in the atomic number |
| B. | An increase in the atomic number |
| C. | A decrease in size |
| D. | An increase in size |
| Answer» D. An increase in size | |
| 9826. |
\[A{{l}^{3+}}\] has a lower ionic radius than \[M{{g}^{2+}}\] because [EAMCET 1992] |
| A. | \[Mg\] atom has less number of neutrons than \[Al\] |
| B. | \[A{{l}^{3+}}\] has a higher nuclear charge than \[M{{g}^{2+}}\] |
| C. | Their electronegativities are different |
| D. | \[Al\] has a lower ionisation potential than \[Mg\] atom |
| Answer» C. Their electronegativities are different | |
| 9827. |
Which is an amphoteric oxide [JEE Orissa 2004, 05] |
| A. | ZnO |
| B. | CaO |
| C. | BaO |
| D. | SrO |
| Answer» B. CaO | |
| 9828. |
Number of electrons in \[-CON{{H}_{2}}\] is [AMU 1988] |
| A. | 22 |
| B. | 24 |
| C. | 20 |
| D. | 28 |
| Answer» C. 20 | |
| 9829. |
Which of the following is not linked with methane |
| A. | Marsh gas |
| B. | Natural gas |
| C. | Producer gas |
| D. | Coal gas |
| Answer» D. Coal gas | |
| 9830. |
The transitional element of III-B group is isomorphic with \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]. Therefore the compound will be |
| A. | Purple |
| B. | Blue |
| C. | White |
| D. | Uncertain |
| Answer» D. Uncertain | |
| 9831. |
Tyndall effect is shown by [Pb. PMT 1999] |
| A. | Sol |
| B. | Solution |
| C. | Plasma |
| D. | Precipitation |
| Answer» B. Solution | |
| 9832. |
The least stable oxide at room temperature is [DCE 2002] |
| A. | ZnO |
| B. | CuO |
| C. | \[S{{b}_{2}}{{O}_{3}}\] |
| D. | \[A{{g}_{2}}O\] |
| Answer» E. | |
| 9833. |
Which of the following reaction is catalysed by enzyme maltase [MP PMT 2003] |
| A. | Starch ® maltose |
| B. | Maltose ® glucose |
| C. | Lactose ® maltose |
| D. | Maltose ® glucose + fructose |
| Answer» C. Lactose ® maltose | |
| 9834. |
Iso-electronic species is [RPMT 2002] |
| A. | \[{{F}^{-}},\,\,{{O}^{-2}}\] |
| B. | \[{{F}^{-}},\,\,O\] |
| C. | \[{{F}^{-}},\,\,{{O}^{+}}\] |
| D. | \[{{F}^{-}},\,\,{{O}^{+2}}\] |
| Answer» B. \[{{F}^{-}},\,\,O\] | |
| 9835. |
In the extraction of aluminium the electrolyte is [CBSE PMT 1989; AIEEE 2002] |
| A. | Fused cryolite with felspar |
| B. | Fused cryolite with fluorspar |
| C. | Pure alumina in molten cryolite |
| D. | Pure alumina with bauxite and molten cryolite |
| Answer» D. Pure alumina with bauxite and molten cryolite | |
| 9836. |
The shapes of methane, ethene and ethyne molecules are, respectively |
| A. | Tetrahedral, planar and linear |
| B. | Tetrahedral, linear and planar |
| C. | Pyramidal, planar and linear |
| D. | Tetrahedral, pyramidal and planar |
| Answer» E. | |
| 9837. |
From a solution of \[CuS{{O}_{4}}\], the metal used to recover copper is [MP PET 1992; CPMT 1990] |
| A. | Sodium |
| B. | Iron |
| C. | Silver |
| D. | \[Hg\] |
| Answer» C. Silver | |
| 9838. |
If X is the specific resistance of the solution and M is the molarity of the solution, the molar conductivity of the solution is given by [Kurukshetra CEE 2002] |
| A. | \[\frac{1000X}{M}\] |
| B. | \[\frac{1000}{MX}\] |
| C. | \[\frac{1000M}{X}\] |
| D. | \[\frac{MX}{1000}\] |
| Answer» C. \[\frac{1000M}{X}\] | |
| 9839. |
A process is taking place at constant temperature and pressure. Then [KCET 2004] |
| A. | \[\Delta H=\Delta E\] |
| B. | \[\Delta H=T\Delta S\] |
| C. | \[\Delta H=0\] |
| D. | \[\Delta S=0\] |
| Answer» C. \[\Delta H=0\] | |
| 9840. |
Boron halides behave as Lewis acids, because of their [CBSE PMT 1996; BHU 2004] |
| A. | Ionic nature |
| B. | Acidic nature |
| C. | Covalent nature |
| D. | Electron deficient nature |
| Answer» E. | |
| 9841. |
In absence of formation of complex ions by the addition of a common ion, the solubility of a given salt is [BHU 1979] |
| A. | Increased |
| B. | Decreased |
| C. | Unaffected |
| D. | First increased and then decreased |
| Answer» C. Unaffected | |
| 9842. |
Which type of hybridisation occurs in ethylene [CBSE PMT 1991; Bihar MEE 1996; JIPMER 1997] |
| A. | sp |
| B. | \[s{{p}^{2}}\] |
| C. | \[s{{p}^{3}}\] |
| D. | \[s{{p}^{3}}d\] |
| Answer» C. \[s{{p}^{3}}\] | |
| 9843. |
\[HSO_{4}^{-}\] is the conjugate base of [NCERT 1977] |
| A. | \[{{H}^{+}}\] |
| B. | \[{{H}_{2}}S{{O}_{3}}\] |
| C. | \[SO_{4}^{2-}\] |
| D. | \[{{H}_{2}}S{{O}_{4}}\] |
| Answer» E. | |
| 9844. |
IUPAC name of \[C{{H}_{2}}=CH-CH(C{{H}_{3}}C{{H}_{2}})\underset{Br}{\mathop{\underset{|\,\,\,\,\,}{\mathop{C=}}\,}}\,C{{H}_{2}}\] is ?.. [JEE Orissa 2004] |
| A. | 4-bromo-3-ethyl-1, 4-pentadiene |
| B. | 2-bromo-3-ethyl-1, 4-pentadiene |
| C. | 2-bromo-3-ethyl-1, 5-pentadiene |
| D. | None of these |
| Answer» C. 2-bromo-3-ethyl-1, 5-pentadiene | |
| 9845. |
Which of the following compounds is not chiral [AIEEE 2004] |
| A. | 1-chloro-2-methyl pentane |
| B. | 2-chloropentane |
| C. | 1-chloropentane |
| D. | 3-chloro-2-methyl pentane |
| Answer» B. 2-chloropentane | |
| 9846. |
Which element is alloyed with copper to form bronze [CPMT 1972, 80, 93; CPMT 1980, 82] |
| A. | Fe |
| B. | Mn |
| C. | Sn |
| D. | Zn |
| Answer» D. Zn | |
| 9847. |
When a liquid boils, there is [JIPMER 2002] |
| A. | An increase in entropy |
| B. | A decrease in entropy |
| C. | An increase in heat of vaporization |
| D. | An increase in free energy |
| Answer» B. A decrease in entropy | |
| 9848. |
Pick out the statement which is not relevant in the discussion of colloids [KCET 2003] |
| A. | Sodium aluminium silicate is used in the softening of hard water |
| B. | Potash alum is used in shaving rounds and as antiseptic in medicine |
| C. | Artificial rain is caused by throwing electrified sand on the clouds from an aeroplane |
| D. | Deltas are formed at a place where the river pours its water into the sea |
| Answer» B. Potash alum is used in shaving rounds and as antiseptic in medicine | |
| 9849. |
On complete combustion 1.4 g hydrocarbon gave 1.8 g water. Empirical formula of the hydrocarbon is |
| A. | \[CH\] |
| B. | \[C{{H}_{2}}\] |
| C. | \[C{{H}_{3}}\] |
| D. | \[C{{H}_{4}}\] |
| Answer» C. \[C{{H}_{3}}\] | |
| 9850. |
Aqueous solution of \[AlC{{l}_{3}}\] is [RPMT 2002] |
| A. | Acidic |
| B. | Basic |
| C. | Amphoteric |
| D. | None of these |
| Answer» B. Basic | |