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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.
| 6851. |
Fire extinguishers contain \[{{H}_{2}}S{{O}_{4}}\] and [AFMC 1980] |
| A. | \[CaC{{O}_{3}}\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | \[NaHC{{O}_{3}}\] |
| D. | \[NaHC{{O}_{3}}\] and \[N{{a}_{2}}C{{O}_{3}}\] |
| Answer» E. | |
| 6852. |
\[K{{O}_{2}}\] (potassium superoxide) is used in oxygen cylinders in space and submarines because it [AIEEE 2002] |
| A. | Absorbs \[C{{O}_{2}}\]and increases \[{{O}_{2}}\] content |
| B. | Eliminates moisture |
| C. | Absorbs \[C{{O}_{2}}\] |
| D. | Produces ozone |
| Answer» B. Eliminates moisture | |
| 6853. |
Which behaves both as a nucleophile and electrophile [IIT-JEE Screening 1991; Pb. CET 1985] |
| A. | \[C{{H}_{3}}N{{H}_{2}}\] |
| B. | \[C{{H}_{3}}Cl\] |
| C. | \[C{{H}_{3}}CN\] |
| D. | \[C{{H}_{3}}OH\] |
| Answer» D. \[C{{H}_{3}}OH\] | |
| 6854. |
\[{{K}_{sp}}\] of an electrolyte AB is \[1\times {{10}^{-10}}.\] \[[{{A}^{+}}]={{10}^{-5}}M,\] which concentration of \[{{B}^{-}}\] will not give precipitate of AB [BHU 2003] |
| A. | \[5\times {{10}^{-6}}\] |
| B. | \[1\times {{10}^{-5}}\] |
| C. | \[2\times {{10}^{-5}}\] |
| D. | \[5\times {{10}^{-5}}\] |
| Answer» B. \[1\times {{10}^{-5}}\] | |
| 6855. |
Which of the following compounds will show geometrical isomerism [IIT-JEE 1998] |
| A. | 2-butene |
| B. | Propene |
| C. | 1-phenylpropene |
| D. | 2-methyl-2-butene |
| Answer» B. Propene | |
| 6856. |
When equal volumes of the following solutions are mixed, precipitation of \[AgCl\,({{K}_{sp}}=1.8\times {{10}^{-10}})\] will occur only with [IIT 1988; CBSE PMT PMT 1992; DCE 2000] |
| A. | \[{{10}^{-4}}M\,A{{g}^{+}}\] and \[{{10}^{-4}}M\,C{{l}^{-}}\] |
| B. | \[{{10}^{-5}}M\,A{{g}^{+}}\] and \[{{10}^{-5}}M\,C{{l}^{-}}\] |
| C. | \[{{10}^{-6}}M\,A{{g}^{+}}\] and \[{{10}^{-6}}M\,C{{l}^{-}}\] |
| D. | \[{{10}^{-4}}M\,A{{g}^{+}}\] and \[{{10}^{-10}}M\,C{{l}^{-}}\] |
| Answer» B. \[{{10}^{-5}}M\,A{{g}^{+}}\] and \[{{10}^{-5}}M\,C{{l}^{-}}\] | |
| 6857. |
Silicon chloroform is prepared by [MH CET 1999] |
| A. | \[Si+HCl\] |
| B. | \[SiC{{l}_{4}}\]+\[{{H}_{2}}O\] |
| C. | \[Si{{F}_{4}}\]+\[NaF\] |
| D. | \[{{H}_{2}}Si{{F}_{6}}+C{{l}_{2}}\] |
| Answer» B. \[SiC{{l}_{4}}\]+\[{{H}_{2}}O\] | |
| 6858. |
Keto-enol tautomerism is found in [IIT-JEE 1988; MADT Bihar 1995] |
| A. | \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-H\] |
| B. | \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-{{C}_{6}}{{H}_{5}}\] |
| C. | \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}\] |
| D. | \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}\] |
| Answer» D. \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}\] | |
| 6859. |
\[CH\equiv CH+HBr\to X,\] product X is [Pb. CET 2003] |
| A. | Ethylene bromide |
| B. | Vinyl bromide |
| C. | Bromo ethane |
| D. | Ethyledine bromide |
| Answer» C. Bromo ethane | |
| 6860. |
The sulphide ion concentration \[[{{S}^{2-}}]\]in saturated \[{{H}_{2}}S\] solution is \[1\times {{10}^{-22}}.\] Which of the following sulphides should be quantitatively precipitated by \[{{H}_{2}}S\] in the presence of dil. \[HCl\] Sulphide Solubility Product (I) \[1.4\times {{10}^{-16}}\] (II) \[1.2\times {{10}^{-22}}\] (III) \[8.2\times {{10}^{-46}}\] (IV) \[5.0\times {{10}^{-34}}\] |
| A. | I, II |
| B. | III, IV |
| C. | II, III, IV |
| D. | Only I |
| Answer» C. II, III, IV | |
| 6861. |
Arrange \[S,\,O\] and \[Se\] in ascending order of electron affinity [Roorkee 1990] |
| A. | Se < S < O |
| B. | Se < O < S |
| C. | S < O < Se |
| D. | S < Se < O |
| Answer» B. Se < O < S | |
| 6862. |
A gas mixture contains 50% helium and 50% methane by volume. What is the percent by weight of methane in the mixture [Kerala PMT 2004] |
| A. | 0.1997 |
| B. | 0.2005 |
| C. | 0.5 |
| D. | 0.75 |
| E. | 0.8003 |
| Answer» F. | |
| 6863. |
The electronic configuration of a dipositive metal \[{{M}^{2+}}\] is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be [MNR 1984, 89; Kerala PMT 1999] |
| A. | 30 |
| B. | 32 |
| C. | 34 |
| D. | 42 |
| Answer» B. 32 | |
| 6864. |
10 \[d{{m}^{3}}\]of \[{{N}_{2}}\]gas and 10 \[d{{m}^{3}}\]of gas X at the same temperature contain the same number of molecules. The gas X is |
| A. | \[CO\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[{{H}_{2}}\] |
| D. | NO |
| Answer» B. \[C{{O}_{2}}\] | |
| 6865. |
When \[{{N}_{2}}\] goes to \[N_{2}^{+},\] the \[N-N\] bond distance ..... and when \[{{O}_{2}}\] goes to \[O_{2}^{+},\] the \[O-O\] bond distance ....... [IIT 1996] |
| A. | Decrease, increase |
| B. | Increase, decrease |
| C. | Increase, increase |
| D. | None of these |
| Answer» C. Increase, increase | |
| 6866. |
The molecular weight of \[{{O}_{2}}\] and \[S{{O}_{2}}\] are 32 and 64 respectively. If one litre of \[{{O}_{2}}\] at \[{{15}^{o}}C\] and 750 mm pressure contains 'N' molecules, the number of molecules in two litres of \[S{{O}_{2}}\] under the same conditions of temperature and pressure will be [CBSE 1990; MNR 1991] |
| A. | \[N/2\] |
| B. | N |
| C. | 2N |
| D. | 4N |
| Answer» D. 4N | |
| 6867. |
For the reaction \[2N{{O}_{2}}_{(g)}\]⇌\[2N{{O}_{(g)}}+{{O}_{2}}_{(g)}\] \[{{K}_{c}}=1.8\times {{10}^{-6}}\] at 185°C. At 185°C, the value of \[{{K}_{c}}\] for the reaction \[N{{O}_{\left( g \right)}}+\frac{1}{2}{{O}_{2}}_{\left( g \right)}\]⇌\[N{{O}_{2}}_{\left( g \right)}\] is [UPSEAT 2000] |
| A. | \[0.9\times {{10}^{6}}\] |
| B. | \[7.5\times {{10}^{2}}\] |
| C. | \[1.95\times {{10}^{-3}}\] |
| D. | \[1.95\times {{10}^{3}}\] |
| Answer» C. \[1.95\times {{10}^{-3}}\] | |
| 6868. |
Of all the three common mineral acids, only sulphuric acid is found to be suitable for making the solution acidic because [Kurukshetra CEE 2002] |
| A. | It does not react with \[KMn{{O}_{4}}\] or the reducing agent |
| B. | Hydrochloric acid reacts with \[KMn{{O}_{4}}\] |
| C. | Nitric acid is an oxidising agent which reacts with reducing agent |
| D. | All of the above are correct |
| Answer» E. | |
| 6869. |
Which of the following is in the increasing order of the ionic character [JIPMER 2002] |
| A. | \[PbC{{l}_{4}}<PbC{{l}_{2}}<CaC{{l}_{2}}<NaCl\] |
| B. | \[PbC{{l}_{2}}<PbC{{l}_{4}}<CaC{{l}_{2}}<NaCl\] |
| C. | \[PbC{{l}_{2}}<PbC{{l}_{4}}<NaCl<CaC{{l}_{2}}\] |
| D. | \[PbC{{l}_{4}}<PbC{{l}_{2}}<NaCl<CaC{{l}_{2}}\] |
| Answer» B. \[PbC{{l}_{2}}<PbC{{l}_{4}}<CaC{{l}_{2}}<NaCl\] | |
| 6870. |
n-pentane and iso pentane can be distinguished by [BVP 2004] |
| A. | \[B{{r}_{2}}\] |
| B. | \[{{O}_{3}}\] |
| C. | conc. \[{{H}_{2}}S{{O}_{4}}\] |
| D. | \[KMn{{O}_{4}}\] |
| Answer» E. | |
| 6871. |
In the equilibrium \[{{A}^{-}}+{{H}_{2}}O\]⇌\[HA+O{{H}^{-}}\] \[({{K}_{a}}=1.0\times {{10}^{-5}})\]. The degree of hydrolysis of 0.001 M solution of the salt is [AMU 1999] |
| A. | \[{{10}^{-3}}\] |
| B. | \[{{10}^{-4}}\] |
| C. | \[{{10}^{-5}}\] |
| D. | \[{{10}^{-6}}\] |
| Answer» B. \[{{10}^{-4}}\] | |
| 6872. |
Which of the following oxide does not form acidic aqueous solution [CPMT 2004] |
| A. | \[{{N}_{2}}{{O}_{3}}\] |
| B. | \[N{{O}_{2}}\] |
| C. | \[{{N}_{2}}{{O}_{5}}\] |
| D. | NO |
| Answer» E. | |
| 6873. |
Identify Z in the following series \[C{{H}_{2}}=C{{H}_{2}}\xrightarrow{HBr}X\xrightarrow{\text{Hydrolysis}}Y\underset{{{I}_{2}}\text{ excess}}{\mathop{\xrightarrow{N{{a}_{2}}C{{O}_{3}}}}}\,Z\] [AIIMS 1983; RPMT 1999] |
| A. | \[{{C}_{2}}{{H}_{5}}I\] |
| B. | \[{{C}_{2}}{{H}_{5}}OH\] |
| C. | \[CH{{I}_{3}}\] |
| D. | \[C{{H}_{3}}CHO\] |
| Answer» D. \[C{{H}_{3}}CHO\] | |
| 6874. |
A weak acid HX has the dissociation constant \[1\times {{10}^{-5}}M\]. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1 M solution of NaX is [IIT JEE Screening 2004] |
| A. | 0.0001% |
| B. | 0.01% |
| C. | 0.1% |
| D. | 0.15% |
| Answer» C. 0.1% | |
| 6875. |
Carbon differs from other elements of the group. Which is the false statement [DPMT 2000] |
| A. | Due to its marked tendency to form long chains (catenation) |
| B. | Due to its unique ability to form multiple bonds |
| C. | Due to d-orbital in penultimate shell |
| D. | Due to its limitation of co-ordination number 4 |
| Answer» D. Due to its limitation of co-ordination number 4 | |
| 6876. |
Compound \[{{C}_{6}}{{H}_{12}}\] is an [AMU 1983] |
| A. | Aliphatic saturated compound |
| B. | Alicyclic compound |
| C. | Aromatic compound |
| D. | Heterocyclic compound |
| Answer» C. Aromatic compound | |
| 6877. |
The ionisation constant of phenol is higher than that of ethanol because [JIPMER 2002] |
| A. | Phenoxide ion is bulkier than ethanoxide |
| B. | Phenoxide ion is stronger base than ethanoxide |
| C. | Phenoxide ion is stabilised through delocalization |
| D. | Phenoxide ion is less stable than ethoxide |
| Answer» D. Phenoxide ion is less stable than ethoxide | |
| 6878. |
Which of the following compounds will show metamerism [KCET 1996] |
| A. | \[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\] |
| B. | \[{{C}_{2}}{{H}_{5}}-S-{{C}_{2}}{{H}_{5}}\] |
| C. | \[C{{H}_{3}}-O-C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}-O-{{C}_{2}}{{H}_{5}}\] |
| Answer» C. \[C{{H}_{3}}-O-C{{H}_{3}}\] | |
| 6879. |
If the solubility product of \[AgBr{{O}_{3}}\] and \[A{{g}_{2}}S{{O}_{4}}\]are \[5.5\times {{10}^{-5}}\] and \[2\times {{10}^{-5}}\]respectively, the relationship between the solubilities of these can be correctly represented as [EAMCET 1985] |
| A. | \[{{S}_{AgBr{{O}_{3}}}}>{{S}_{A{{g}_{2}}S{{O}_{4}}}}\] |
| B. | \[{{S}_{AgBr{{O}_{3}}}}<{{S}_{A{{g}_{2}}S{{O}_{4}}}}\] |
| C. | \[{{S}_{AgBr{{O}_{3}}}}={{S}_{A{{g}_{2}}S{{O}_{4}}}}\] |
| D. | \[{{S}_{AgBr{{O}_{3}}}}\approx {{S}_{A{{g}_{2}}S{{O}_{4}}}}\] |
| Answer» C. \[{{S}_{AgBr{{O}_{3}}}}={{S}_{A{{g}_{2}}S{{O}_{4}}}}\] | |
| 6880. |
Which one has asymmetric C-atom [Roorkee 1995] |
| A. | \[C{{H}_{3}}-C{{H}_{2}}-\underset{Br}{\mathop{\underset{|\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,\] |
| B. | \[C{{H}_{3}}-\underset{Br}{\mathop{\underset{|\,\,\,}{\mathop{CH}}\,}}\,--\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{3}}\] |
| C. | \[C{{H}_{3}}-C{{H}_{2}}-\underset{Br}{\mathop{\underset{|\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}-\underset{Br\,}{\mathop{\underset{|\,\,\,\,}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,}{\mathop{C-}}\,}}\,}}\,}}\,C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\] |
| Answer» C. \[C{{H}_{3}}-C{{H}_{2}}-\underset{Br}{\mathop{\underset{|\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{3}}\] | |
| 6881. |
In presence of light toluene on reaction with chlorine gives [RPET 1999] |
| A. | Benzoyl chloride |
| B. | Ortho chlorotoluene |
| C. | Para chloro toluene |
| D. | Benzyl chloride |
| Answer» E. | |
| 6882. |
\[p{{K}_{a}}\]of acetic acid is \[4.74\]. The concentration of \[C{{H}_{3}}COONa\] is 0.01 M. The pH of \[C{{H}_{3}}OONa\]is [Orissa JEE 2004] |
| A. | 3.37 |
| B. | 4.37 |
| C. | 4.74 |
| D. | 0.474 |
| Answer» B. 4.37 | |
| 6883. |
The +I effect of alkyl groups is in the order [DCE 2002] |
| A. | \[2{}^\circ \text{ }>\text{ }3{}^\circ \text{ }>\text{ }1{}^\circ ~~~~~~~~~~\] |
| B. | \[1{}^\circ \text{ }>\text{ }2{}^\circ \text{ }>\text{ }3{}^\circ \] |
| C. | \[3{}^\circ \text{ }>\text{ }2{}^\circ \text{ }>\text{ }1{}^\circ ~~~~~~~~~~\] |
| D. | None of these |
| Answer» D. None of these | |
| 6884. |
Which kind of isomerism will butene-2 show |
| A. | Geometrical |
| B. | Optical |
| C. | Position |
| D. | None of these |
| Answer» B. Optical | |
| 6885. |
\[{{K}_{sp}}\] for \[Cr{{(OH)}_{3}}\]is \[2.7\times {{10}^{-31}}\]. What is its solubility in moles / litre. [JEE Orissa 2004] |
| A. | \[1\times {{10}^{-8}}\] |
| B. | \[8\times {{10}^{-8}}\] |
| C. | \[1.1\times {{10}^{-8}}\] |
| D. | \[0.18\times {{10}^{-8}}\] |
| Answer» B. \[8\times {{10}^{-8}}\] | |
| 6886. |
Which of the following orders regarding relative stability of free radicals is correct [UPSEAT 2004] |
| A. | \[3{}^\circ <2{}^\circ <1{}^\circ \] |
| B. | \[3{}^\circ \text{ }>\text{ }2{}^\circ \text{ }>\text{ }1{}^\circ \] |
| C. | \[1{}^\circ \text{ }<\text{ }2{}^\circ \text{ }>\text{ }3{}^\circ \] |
| D. | \[3{}^\circ \text{ }>\text{ }2{}^\circ \text{ }<\text{ }1{}^\circ \] |
| Answer» C. \[1{}^\circ \text{ }<\text{ }2{}^\circ \text{ }>\text{ }3{}^\circ \] | |
| 6887. |
The only o, p-directing group which is deactivating in nature is |
| A. | \[-N{{H}_{2}}\] |
| B. | \[-OH\] |
| C. | \[-X\] (Halogens) |
| D. | \[-R\] (Alkyl groups) |
| Answer» D. \[-R\] (Alkyl groups) | |
| 6888. |
A 0.004 M solution of \[N{{a}_{2}}S{{O}_{4}}\] is isotonic with a 0.010 M solution of glucose at same temperature. The apparent degree of disociation of \[N{{a}_{2}}S{{O}_{4}}\] is [IIT JEE Screening 2004] |
| A. | 25% |
| B. | 50% |
| C. | 75% |
| D. | 85% |
| Answer» D. 85% | |
| 6889. |
Which of the following gives most stable carbocation by dehydration [RPMT 2002] |
| A. | \[(C{{H}_{3}}){{}_{2}}CH-OH\] |
| B. | \[{{(C{{H}_{3}})}_{3}}C-OH\] |
| C. | \[C{{H}_{3}}-C{{H}_{2}}-OH\] |
| D. | \[C{{H}_{3}}-C{{H}_{2}}-O-C{{H}_{2}}-C{{H}_{3}}\] |
| Answer» C. \[C{{H}_{3}}-C{{H}_{2}}-OH\] | |
| 6890. |
When acetylene is reacted with HBr, we get [CPMT 1979; JIPMER 2002] |
| A. | Methyl bromide |
| B. | Ethyl bromide |
| C. | Ethylene bromide |
| D. | Ethylidene bromide |
| Answer» E. | |
| 6891. |
The solubility of \[CuBr\]is \[2\times {{10}^{-4}}mol/l\]at \[25{}^\circ C\]. The \[{{K}_{sp}}\] value for \[CuBr\]is [AIIMS 2002] |
| A. | \[4\times {{10}^{-8}}mo{{l}^{2}}{{l}^{-2}}\] |
| B. | \[4\times {{10}^{-11}}mo{{l}^{2}}{{L}^{-1}}\] |
| C. | \[4\times {{10}^{-4}}mo{{l}^{2}}{{l}^{-2}}\] |
| D. | \[4\times {{10}^{-15}}mo{{l}^{2}}{{l}^{-2}}\] |
| Answer» B. \[4\times {{10}^{-11}}mo{{l}^{2}}{{L}^{-1}}\] | |
| 6892. |
Which of the following salt becomes plaster of paris on being appropriately hydrated [CPMT 1985] |
| A. | \[ZnC{{O}_{3}}\] |
| B. | \[CaS{{O}_{4}}\] |
| C. | \[MgS{{O}_{4}}\] |
| D. | \[CaC{{O}_{3}}\] |
| Answer» C. \[MgS{{O}_{4}}\] | |
| 6893. |
Which of the following is formed as a result of biological oxidation of benzene in the body of the dog [Manipal MEE 1995] |
| A. | Acrylic acid |
| B. | Cinnamic acid |
| C. | Maleic acid |
| D. | Gluconic acid |
| Answer» C. Maleic acid | |
| 6894. |
Which is neucleophile [DPMT 2001; RPMT 2002] |
| A. | \[B{{F}_{3}}\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[BeC{{l}_{2}}\] |
| D. | \[{{H}_{2}}O\] |
| Answer» C. \[BeC{{l}_{2}}\] | |
| 6895. |
In benzene 1, 3 position is called |
| A. | Meta |
| B. | Para |
| C. | Ortho |
| D. | Odd position |
| Answer» B. Para | |
| 6896. |
What is \[[{{H}^{+}}]\] of a solution that is \[0.01\,M\] in \[HCN\]and \[0.02\,M\] in \[NaCN\] \[({{K}_{a}}\]for \[HCN=6.2\times {{10}^{-10}})\] [MP PMT 2000] |
| A. | \[3.1\times {{10}^{10}}\] |
| B. | \[6.2\times {{10}^{5}}\] |
| C. | \[6.2\times {{10}^{-10}}\] |
| D. | \[3.1\times {{10}^{-10}}\] |
| Answer» E. | |
| 6897. |
Which has highest melting point [RPMT 1997] |
| A. | \[LiCl\] |
| B. | \[BeC{{l}_{2}}\] |
| C. | \[BC{{l}_{3}}\] |
| D. | \[CC{{l}_{4}}\] |
| Answer» C. \[BC{{l}_{3}}\] | |
| 6898. |
How many enantiomer pairs are obtained by monochlorination of 2, 3-dimethylbutane [Kerala PMT 2004] |
| A. | Nil |
| B. | Four |
| C. | Two |
| D. | Three |
| E. | One |
| Answer» F. | |
| 6899. |
The octane number of a sample of petrol is 40. It means that its knocking property is equal to the mixture of [MP PMT 2003] |
| A. | 40% n-heptane + 60% iso-octane |
| B. | 40% petrol + 60% iso-octane |
| C. | 60% n-heptane + 40% iso-octane |
| D. | 60% petrol + 40% iso-octane |
| Answer» D. 60% petrol + 40% iso-octane | |
| 6900. |
Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be |
| A. | 45.3 g |
| B. | 4.53 g |
| C. | 0.453 g |
| D. | 453 g |
| Answer» C. 0.453 g | |