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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.
| 9851. |
Artificial elements have been prepared by bombardment reactions in high energy accelerators. What is the mass number of the element X produced in the following nuclear reaction \[_{95}^{249}Cf+_{7}^{15}N{{\to }_{105}}X+4_{0}^{1}n\] [AMU (Engg.) 2002] |
| A. | 261 |
| B. | 264 |
| C. | 260 |
| D. | 257 |
| Answer» D. 257 | |
| 9852. |
The indicator used in the titration of sodium carbonate with sulphuric acid is [DPMT 2001] |
| A. | Phenolphthalein |
| B. | Methyl orange |
| C. | Potassium ferrocynide |
| D. | Potassium ferricynide |
| Answer» C. Potassium ferrocynide | |
| 9853. |
When 100 ml of 1\[M\,NaOH\]solution and 10 ml of 10\[N\,{{H}_{2}}S{{O}_{4}}\]solution are mixed together, the resulting solution will be [DPMT 1982] |
| A. | Alkaline |
| B. | Acidic |
| C. | Strongly acidic |
| D. | Neutral |
| Answer» E. | |
| 9854. |
Which is the correct representation of the solubility product constant of \[A{{g}_{2}}Cr{{O}_{4}}\] [NCERT 1974, 75] |
| A. | \[{{[A{{g}^{+}}]}^{2}}\,[CrO_{4}^{-2}]\] |
| B. | \[[A{{g}^{+}}]\,\,[CrO_{4}^{-2}]\] |
| C. | \[[2A{{g}^{+}}]\,\,[CrO_{4}^{-2}]\] |
| D. | \[{{[2A{{g}^{+}}]}^{2}}\,\,[CrO_{4}^{-2}]\] |
| Answer» B. \[[A{{g}^{+}}]\,\,[CrO_{4}^{-2}]\] | |
| 9855. |
In dry cell the reaction which takes place at the zinc anode is [MP PET 1996] |
| A. | \[Z{{n}^{2+}}+2{{e}^{-}}\to Zn(s)\] |
| B. | \[Zn(s)\to Z{{n}^{2+}}+2{{e}^{-}}\] |
| C. | \[M{{n}^{2+}}+2{{e}^{-}}\to Mn(s)\] |
| D. | \[Mn(s)\to M{{n}^{+}}+{{e}^{-}}+1.5V\] |
| Answer» C. \[M{{n}^{2+}}+2{{e}^{-}}\to Mn(s)\] | |
| 9856. |
What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene [CBSE PMT 1989] |
| A. | 2.8 kg |
| B. | 6.4 kg |
| C. | 9.6 kg |
| D. | 96 kg |
| Answer» C. 9.6 kg | |
| 9857. |
The compound which does not possess a peroxide linkage is [JIPMER 1999] |
| A. | \[N{{a}_{2}}{{O}_{2}}\] |
| B. | \[Cr{{O}_{5}}\] |
| C. | \[{{H}_{2}}S{{O}_{5}}\] |
| D. | \[Pb{{O}_{2}}\] |
| Answer» E. | |
| 9858. |
If half-life of a certain radioactive nucleus is \[1000\,s,\] the disintegration constant is [MP PET 2001] |
| A. | \[6.93\times {{10}^{2}}{{s}^{-1}}\] |
| B. | \[6.93\times {{10}^{-4}}s\] |
| C. | \[6.93\times {{10}^{-4}}{{s}^{-1}}\] |
| D. | \[6.93\times {{10}^{3}}s\] |
| Answer» D. \[6.93\times {{10}^{3}}s\] | |
| 9859. |
Which of the following is the electron deficient molecule [CBSE PMT 2005] |
| A. | \[{{B}_{2}}{{H}_{6}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[P{{H}_{3}}\] |
| D. | \[Si{{H}_{4}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{6}}\] | |
| 9860. |
An invert sugar is [AFMC 2000] |
| A. | Isorotatory |
| B. | Dextrorotatory |
| C. | Laevorotatory |
| D. | Optically inactive |
| Answer» D. Optically inactive | |
| 9861. |
The IUPAC name of n-butyl chloride is [Kerala (Med.) 2002] |
| A. | 1-chlorobutane |
| B. | n-chlorobutane |
| C. | ter-butylchloride |
| D. | 2-methylbutane |
| Answer» B. n-chlorobutane | |
| 9862. |
If \[C{{H}_{4}}\] is known as methane, then \[{{C}_{9}}{{H}_{20}}\]is known as [Kerala (Med.) 2002] |
| A. | Hexane |
| B. | Nonane |
| C. | Octane |
| D. | Butane |
| Answer» C. Octane | |
| 9863. |
Which of the following pairs of a chemical reaction is certain to result in spontaneous reaction ? [CBSE PMT 2005] |
| A. | Exothermic and decreasing disorder |
| B. | Endothermic and increasing disorder |
| C. | Exothermic and increasing disorder |
| D. | Endothermic and decreasing disorder |
| Answer» D. Endothermic and decreasing disorder | |
| 9864. |
When a colloidal solution is observed under a microscope we can see [CPMT 1985] |
| A. | Light scattered by colloidal particles |
| B. | Size of colloidal particles |
| C. | Shape of colloidal particles |
| D. | Relative size of the colloidal particles |
| Answer» B. Size of colloidal particles | |
| 9865. |
Point out the wrong statement in relation to the structure of benzene |
| A. | It forms only one monosubstitution product |
| B. | The C - C bond distance in benzene is uniformly 1.397 Å |
| C. | It is a resonance hybrid of a number of canonical forms |
| D. | It has three delocalised \[\pi \]- molecular orbitals |
| Answer» B. The C - C bond distance in benzene is uniformly 1.397 Å | |
| 9866. |
Magnesia is |
| A. | \[MgC{{O}_{3}}\] |
| B. | \[MgO\] |
| C. | \[MgS{{O}_{4}}\] |
| D. | \[MgC{{l}_{2}}\] |
| Answer» C. \[MgS{{O}_{4}}\] | |
| 9867. |
Which element possesses biggest atomic radii |
| A. | \[P\] |
| B. | \[Si\] |
| C. | \[Al\] |
| D. | \[Mg\] |
| Answer» E. | |
| 9868. |
Addition of high proportions of manganese makes steel useful in making rails of rail-roads because manganese [IIT 1998] |
| A. | Gives hardness to steel |
| B. | Helps the formation of oxides of iron |
| C. | Can remove oxygen and sulphur |
| D. | Can show highest oxidation state of +7 |
| Answer» B. Helps the formation of oxides of iron | |
| 9869. |
Which of the following statements about \[{{H}_{3}}B{{O}_{3}}\] is not correct [CBSE PMT 1994] |
| A. | It is a strong tribasic acid |
| B. | It is prepared by acidifying an aqueous solution of borax |
| C. | It has a layer structure in which planar \[B{{O}_{3}}\] units are joined by hydrogen bonds |
| D. | It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ion |
| Answer» B. It is prepared by acidifying an aqueous solution of borax | |
| 9870. |
The electrolytic decomposition of dilute sulphonic acid with platinum electrode in cathodic reaction is [MNR 1988; UPSEAT 1999, 2002] |
| A. | Oxidation |
| B. | Reduction |
| C. | Oxidation and reduction both |
| D. | Neutralisation |
| Answer» C. Oxidation and reduction both | |
| 9871. |
Which of the following is a good conductor of heat of electricity [Pb. CET 2003] |
| A. | Diamond |
| B. | Graphite |
| C. | Anthracite |
| D. | Charcoal |
| Answer» C. Anthracite | |
| 9872. |
Which of the following is not a characteristic of chemisorption [KCET 2003] |
| A. | \[\Delta H\] is of the order of 400 kJ |
| B. | Adsorption is irreversible |
| C. | Adsorption may be multimolecular layer |
| D. | Adsorption is specific |
| Answer» D. Adsorption is specific | |
| 9873. |
Which pair will show common ion effect [MP PMT 1990, 99; Pb. PMT 2001] |
| A. | \[BaC{{l}_{2}}+Ba\,{{(N{{O}_{3}})}_{2}}\] |
| B. | \[NaCl+HCl\] |
| C. | \[N{{H}_{4}}OH+N{{H}_{4}}Cl\] |
| D. | \[AgCN+KCN\] |
| Answer» D. \[AgCN+KCN\] | |
| 9874. |
Which of the following is most reducing agent [RPMT 2002] |
| A. | \[HN{{O}_{3}}\] |
| B. | \[Na\] |
| C. | \[C{{l}_{2}}\] |
| D. | \[Cr\] |
| Answer» C. \[C{{l}_{2}}\] | |
| 9875. |
If \[Na\]is heated in presence of air, it forms [AFMC 2002] |
| A. | \[N{{a}_{2}}C{{O}_{3}}\] |
| B. | \[N{{a}_{2}}{{O}_{2}}\] |
| C. | \[N{{a}_{2}}O\] |
| D. | Both b and c |
| Answer» E. | |
| 9876. |
\[Sn\] is dissolved in excess of \[NaOH\] solution, the compound obtained is [RPMT 1997] |
| A. | \[Sn{{(OH)}_{2}}\] |
| B. | \[N{{a}_{2}}Sn{{O}_{3}}\] |
| C. | \[N{{a}_{2}}Sn{{O}_{2}}\] |
| D. | \[Sn{{O}_{2}}\] |
| Answer» C. \[N{{a}_{2}}Sn{{O}_{2}}\] | |
| 9877. |
\[Na\] imparts yellow colour to Bunsen flame because of [RPMT 1997] |
| A. | Low ionisation potential |
| B. | Sensitivity |
| C. | Sublimation |
| D. | Absorbed high radiation |
| Answer» E. | |
| 9878. |
Electrophilic addition on a carbon-carbon double bond involves the intermediate formation of a more stable carbocation. This statement is called |
| A. | Saytzeff's rule |
| B. | Baeyer's effect |
| C. | Markownikoff's rule |
| D. | None of these |
| Answer» D. None of these | |
| 9879. |
Catalytic dehydrogenation of n-haptane in presence of \[C{{r}_{2}}{{O}_{3}}/A{{l}_{2}}{{O}_{3}}\] at 750 K gives [Roorkee 1999] |
| A. | iso-heptane |
| B. | 1-heptene |
| C. | toluene |
| D. | 2, 3-dimethylpentene-1 |
| Answer» D. 2, 3-dimethylpentene-1 | |
| 9880. |
Which of the following dissolves in water to give a neutral solution [Bihar MADT 1980] |
| A. | \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] |
| B. | \[Ba{{(N{{O}_{3}})}_{2}}\] |
| C. | \[CrC{{l}_{3}}\] |
| D. | \[CuS{{O}_{4}}\] |
| Answer» C. \[CrC{{l}_{3}}\] | |
| 9881. |
Which of the following polymers are hard |
| A. | Linear |
| B. | Cross-linked |
| C. | Branched chain |
| D. | Thermoplastic |
| Answer» C. Branched chain | |
| 9882. |
The action of steam on heated iron is represented as [MP PMT 1994] |
| A. | \[3Fe+4{{H}_{2}}O\to F{{e}_{3}}{{O}_{4}}+4{{H}_{2}}\] |
| B. | \[2Fe+3{{H}_{2}}O\to F{{e}_{2}}{{O}_{3}}+3{{H}_{2}}\] |
| C. | \[Fe+{{H}_{2}}O\to FeO+{{H}_{2}}\] |
| D. | \[2Fe+{{H}_{2}}O+{{O}_{2}}\to F{{e}_{2}}{{O}_{3}}+{{H}_{2}}\] |
| Answer» B. \[2Fe+3{{H}_{2}}O\to F{{e}_{2}}{{O}_{3}}+3{{H}_{2}}\] | |
| 9883. |
Strongest acid is [MP PMT 2004] |
| A. | \[HC\equiv CH\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[{{C}_{6}}{{H}_{6}}\] |
| D. | \[C{{H}_{3}}OH\] |
| Answer» E. | |
| 9884. |
Which of the following electrolytes have maximum coagulating power |
| A. | \[CC{{l}_{4}}\] |
| B. | \[ZnC{{l}_{2}}\] |
| C. | \[KCl\] |
| D. | \[NaCl\] |
| Answer» C. \[KCl\] | |
| 9885. |
The energy of an electron revolving in \[{{n}^{th}}\] Bohr's orbit of an atom is given by the expression [MP PMT 1999] |
| A. | \[{{E}_{n}}=-\frac{2{{\pi }^{2}}{{m}^{4}}{{e}^{2}}{{z}^{2}}}{{{n}^{2}}{{h}^{2}}}\] |
| B. | \[{{E}_{n}}=-\frac{2{{\pi }^{2}}m{{e}^{2}}{{z}^{2}}}{{{n}^{2}}{{h}^{2}}}\] |
| C. | \[{{E}_{n}}=-\frac{2{{\pi }^{2}}m{{e}^{4}}{{z}^{2}}}{{{n}^{2}}{{h}^{2}}}\] |
| D. | \[{{E}_{n}}=-\frac{2\pi {{m}^{2}}{{e}^{2}}{{z}^{4}}}{{{n}^{2}}{{h}^{2}}}\] |
| Answer» D. \[{{E}_{n}}=-\frac{2\pi {{m}^{2}}{{e}^{2}}{{z}^{4}}}{{{n}^{2}}{{h}^{2}}}\] | |
| 9886. |
The number of atoms in 4.25 g of \[N{{H}_{3}}\]is approximately [CBSE PMT 1999; MH CET 2003] |
| A. | \[1\times {{10}^{23}}\] |
| B. | \[2\times {{10}^{23}}\] |
| C. | \[4\times {{10}^{23}}\] |
| D. | \[6\times {{10}^{23}}\] |
| Answer» E. | |
| 9887. |
Which of the following can be represented by the configuration \[[Kr]\,5{{s}^{2}}\]? [MP PMT 1997] |
| A. | \[Ca\] |
| B. | \[Sr\] |
| C. | \[Ba\] |
| D. | \[Ra\] |
| Answer» C. \[Ba\] | |
| 9888. |
A saturated solution of \[A{{g}_{2}}S{{O}_{4}}\]is \[2.5\times {{10}^{-2}}\]M; The value of its solubility product is [Pb.CET 2004] |
| A. | \[62.5\times {{10}^{-6}}\] |
| B. | \[6.25\times {{10}^{-4}}\] |
| C. | \[15.625\times {{10}^{-6}}\] |
| D. | \[3.125\times {{10}^{-6}}\] |
| Answer» B. \[6.25\times {{10}^{-4}}\] | |
| 9889. |
Compared with an atom of atomic weight 12 and atomic number 6, the atom of atomic weight 13 and atomic number 6 [NCERT 1971] |
| A. | Contains more neutrons |
| B. | Contains more electrons |
| C. | Contains more protons |
| D. | Is a different element |
| Answer» B. Contains more electrons | |
| 9890. |
Glucose is a [CPMT 1984] |
| A. | Monosaccharide |
| B. | Disaccharide |
| C. | Trisaccharide |
| D. | Polysaccharide |
| Answer» B. Disaccharide | |
| 9891. |
On passing \[{{H}_{2}}S\] gas through a highly acidic solution containing \[C{{d}^{2+}}\]ions, \[CdS\]is not precipitated because |
| A. | Of common ion effect |
| B. | The solubility of \[CdS\]is low |
| C. | \[C{{d}^{2+}}\]ions do not form complex with \[{{H}_{2}}S\] |
| D. | The solubility product of \[CdS\] is low |
| Answer» B. The solubility of \[CdS\]is low | |
| 9892. |
In the electrolytic purification of copper some gold is found in the [CPMT 1972; AFMC 1995; RPET 2003] |
| A. | Cathode |
| B. | Cathode mud |
| C. | Anode mud |
| D. | Electrolyte |
| Answer» D. Electrolyte | |
| 9893. |
Activated charcoal is used to remove coloring matter from pure substances. It works by [KCET 2005] |
| A. | Oxidation |
| B. | Reduction |
| C. | Bleaching |
| D. | Adsorption |
| Answer» E. | |
| 9894. |
Setting of plaster of paris is [MP PMT 1985; CPMT 1989] |
| A. | Oxidation with atmospheric oxygen |
| B. | Combination with atmospheric \[C{{O}_{2}}\] |
| C. | Dehydration |
| D. | Hydration to yield another hydrate |
| Answer» E. | |
| 9895. |
Which of the following metal is found in green colouring pigment chlorophyll of plants [KCET 1993; RPMT 1999; MP PET 2002] |
| A. | \[Fe\] |
| B. | \[Mg\] |
| C. | \[Na\] |
| D. | \[Al\] |
| Answer» C. \[Na\] | |
| 9896. |
To prevent magnesium from oxidation in electrolytic extraction process |
| A. | Some calcium fluoride is added |
| B. | Some chlorides are added |
| C. | Metal is taken out by spoons |
| D. | The whole process is done in an atmosphere of coal gas |
| Answer» E. | |
| 9897. |
Milk is a colloid in which [MP PMT 1985, 2002; MP PET 2001; JIPMER (Med.) 2002] |
| A. | A liquid is dispersed in liquid |
| B. | A solid is dispersed in liquid |
| C. | A gas is dispersed in liquid |
| D. | Some suger is dispersed in water |
| Answer» B. A solid is dispersed in liquid | |
| 9898. |
Nitrogen gas is absorbed by [DPMT 2001] |
| A. | Calcium hydroxide |
| B. | Ferrous sulphate |
| C. | Calcium carbide |
| D. | Aluminium carbide |
| Answer» D. Aluminium carbide | |
| 9899. |
Number of water molecules in Mohr's salt is [CPMT 1997; AIIMS 2001; JIPMER 2001] |
| A. | 7 |
| B. | 6 |
| C. | 5 |
| D. | 8 |
| Answer» C. 5 | |
| 9900. |
The hydrolysis of sucrose produces a mixture which is |
| A. | Laevorotatory |
| B. | Dextrorotatory |
| C. | Equally both (+) and (?) rotatory |
| D. | Optically inactive |
| Answer» B. Dextrorotatory | |