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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.
| 2601. |
An organic compound dissolved in dry benzene evolved hydrogen on treatment with sodium. It is [NCERT 1981; SCRA 1990] |
| A. | A ketone |
| B. | An aldehyde |
| C. | A tertiary amine |
| D. | An alcohol |
| Answer» E. | |
| 2602. |
If formaldehyde and potassium hydroxide are heated, then we get [CPMT 1989, 90; KCET 2000] |
| A. | Acetylene |
| B. | Methane |
| C. | Methyl alcohol |
| D. | Ethyl formate |
| Answer» D. Ethyl formate | |
| 2603. |
Salicylaldehyde can be prepared from [CPMT 1983] |
| A. | Phenol and chloroform |
| B. | Phenol, chloroform and sodium hydroxide |
| C. | Phenol, carbon tetrachloride and NaOH |
| D. | None of these |
| Answer» C. Phenol, carbon tetrachloride and NaOH | |
| 2604. |
The reaction given below is known as \[{{C}_{2}}{{H}_{5}}ONa+I{{C}_{2}}{{H}_{5}}\xrightarrow{{}}{{C}_{2}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}+NaI\] [CPMT 1990; KCET 1990; MH CET 2003; Pb. CET 2002] |
| A. | Kolbe's synthesis |
| B. | Wurtz's synthesis |
| C. | Williamson's synthesis |
| D. | Grignard's synthesis |
| Answer» D. Grignard's synthesis | |
| 2605. |
Benzene diazonium chloride on boiling with dilute sulphuric acid gives [MP PMT 1983] |
| A. | Toluene |
| B. | Benzoic acid |
| C. | Benzene |
| D. | Phenol |
| Answer» E. | |
| 2606. |
Benzyl alcohol is obtained from benzaldehyde by [CPMT 1983; MNR 1993] |
| A. | Fittig's reaction |
| B. | Cannizaro's reaction |
| C. | Kolbe's reaction |
| D. | Wurtz's reaction |
| Answer» C. Kolbe's reaction | |
| 2607. |
Formaldehyde gives an additive product with methyl magnesium iodide which on aqueous hydrolysis gives [MP PMT/PET 1988] |
| A. | Isopropyl alcohol |
| B. | Ethyl alcohol |
| C. | Methyl alcohol |
| D. | Propyl alcohol |
| Answer» C. Methyl alcohol | |
| 2608. |
\[LiAl{{H}_{4}}\] converts acetic acid into [CPMT 1977; MP PMT 1990, 92] |
| A. | Acetaldehyde |
| B. | Methane |
| C. | Ethyl alcohol |
| D. | Methyl alcohol |
| Answer» D. Methyl alcohol | |
| 2609. |
On heating aqueous solution of benzene diazonium chloride, which is formed [CPMT 1988; BHU 1980] |
| A. | Benzene |
| B. | Chlorobenzene |
| C. | Phenol |
| D. | Aniline |
| Answer» D. Aniline | |
| 2610. |
Primary alcohols can be obtained from the reaction of the RMgX with [Pb. PMT 2001] |
| A. | \[C{{O}_{2}}\] |
| B. | \[HCHO\] |
| C. | \[C{{H}_{3}}CHO\] |
| D. | \[{{H}_{2}}O\] |
| Answer» C. \[C{{H}_{3}}CHO\] | |
| 2611. |
Which one of the following metals will give blue ash when its salt is heated with \[N{{a}_{2}}C{{O}_{3}}\] solid and \[Co{{\left( N{{O}_{3}} \right)}_{2}}\] on a charcoal piece [MNR 1987] |
| A. | \[Cu\] |
| B. | \[Mg\] |
| C. | \[Al\] |
| D. | \[Zn\] |
| Answer» D. \[Zn\] | |
| 2612. |
Ethanol is prepared industrially by [MP PMT 1989] |
| A. | Hydration of ethylene |
| B. | Fermentation of sugars |
| C. | Both the above |
| D. | None of these |
| Answer» D. None of these | |
| 2613. |
On mixing two colourless gases, a deep brown colour is observed. The gases are [CPMT 1977] |
| A. | \[{{N}_{2}}O\] and \[{{O}_{2}}\] |
| B. | \[NO\] and \[{{O}_{2}}\] |
| C. | \[{{N}_{2}}{{O}_{3}}\] and \[{{O}_{2}}\] |
| D. | None of these |
| Answer» C. \[{{N}_{2}}{{O}_{3}}\] and \[{{O}_{2}}\] | |
| 2614. |
Sodium borate on reaction with \[{{H}_{2}}S{{O}_{4}}\] (conc.) and \[{{C}_{2}}{{H}_{5}}OH\] gives a compound ?A? which burns with green flame. The compound ?A? is [MP PET 1994] |
| A. | \[{{H}_{2}}{{B}_{4}}{{O}_{7}}\] |
| B. | \[{{\left( {{C}_{2}}{{H}_{5}} \right)}_{2}}{{B}_{4}}{{O}_{7}}\] |
| C. | \[{{H}_{3}}B{{O}_{3}}\] |
| D. | \[{{\left( {{C}_{2}}{{H}_{5}} \right)}_{3}}B{{O}_{3}}\] |
| Answer» E. | |
| 2615. |
Which gives violet coloured bead in borax bead test [BHU 1988; MP PET 1997] |
| A. | \[F{{e}^{2+}}\] |
| B. | \[N{{i}^{2+}}\] |
| C. | \[C{{o}^{2+}}\] |
| D. | \[M{{n}^{2+}}\] |
| Answer» E. | |
| 2616. |
The composition of 'Golden spangles' is [CBSE PMT 1990] |
| A. | \[PbCr{{O}_{4}}\] |
| B. | \[Pb{{I}_{2}}\] |
| C. | \[A{{s}_{2}}{{S}_{3}}\] |
| D. | \[BaCr{{O}_{4}}\] |
| Answer» E. | |
| 2617. |
Which of the following is colored compound? [BCECE 2005] |
| A. | \[Cu{{F}_{2}}\] |
| B. | \[Cul\] |
| C. | \[NaCl\] |
| D. | \[MgC{{l}_{2}}\] |
| Answer» B. \[Cul\] | |
| 2618. |
\[Mn{{O}_{2}}\] and \[{{H}_{2}}S{{O}_{4}}\] added to \[NaCl\], the greenish yellow gas liberated is [Orissa JEE 2005] |
| A. | \[C{{l}_{2}}\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[{{N}_{2}}\] |
| D. | \[{{H}_{2}}\] |
| Answer» B. \[N{{H}_{3}}\] | |
| 2619. |
A colourless gas with the smell of rotten fish is [AFMC 2005] |
| A. | \[{{H}_{2}}S\] |
| B. | \[P{{H}_{3}}\] |
| C. | \[S{{O}_{2}}\] |
| D. | None of these |
| Answer» C. \[S{{O}_{2}}\] | |
| 2620. |
In laboratory burners, we use [DCE 2004] |
| A. | Producer gas |
| B. | Oil gas |
| C. | Gobar gas |
| D. | Coal gas |
| Answer» C. Gobar gas | |
| 2621. |
The metal that does not give the borax-bead test is [MP PMT 1999] |
| A. | Chromium |
| B. | Nickel |
| C. | Lead |
| D. | Manganese |
| Answer» D. Manganese | |
| 2622. |
Which of the following imparts green colour to the burner flame [DCE 2004] |
| A. | \[B{{(OMe)}_{3}}\] |
| B. | \[Na(OMe)\] |
| C. | \[Al{{(O\Pr )}_{3}}\] |
| D. | \[Sn{{(OH)}_{2}}\] |
| Answer» B. \[Na(OMe)\] | |
| 2623. |
Blue borax bead is obtained with [MADT Bihar 1982; MP PET 1995] |
| A. | \[Zn\] |
| B. | Cobalt |
| C. | Chromium |
| D. | \[Fe\] |
| Answer» C. Chromium | |
| 2624. |
Two gases when mixed give white dense fumes, the gases are |
| A. | \[N{{H}_{3}}\] and \[S{{O}_{2}}\] |
| B. | \[S{{O}_{2}}\] and steam |
| C. | \[N{{H}_{3}}\] and \[HCl\] |
| D. | \[N{{H}_{3}}\] and \[{{N}_{2}}O\] |
| Answer» D. \[N{{H}_{3}}\] and \[{{N}_{2}}O\] | |
| 2625. |
Which of the following salt gives white precipitate with \[AgN{{O}_{3}}\] solution and dil. \[{{H}_{2}}S{{O}_{4}}\] solution and gives green flame test |
| A. | \[CuC{{l}_{2}}\] |
| B. | \[BaC{{l}_{2}}\] |
| C. | \[PbC{{l}_{2}}\] |
| D. | \[Cu{{(N{{O}_{3}})}_{2}}\] |
| Answer» C. \[PbC{{l}_{2}}\] | |
| 2626. |
Starch-iodide paper is used for the test of |
| A. | Iodine |
| B. | Iodide ion |
| C. | Oxidising agent |
| D. | Reducing agent |
| Answer» B. Iodide ion | |
| 2627. |
A precipitate of calcium oxalate will not dissolve in [CPMT 1971] |
| A. | \[HCl\] |
| B. | \[HN{{O}_{3}}\] |
| C. | Aqua-regia |
| D. | Acetic acid |
| Answer» E. | |
| 2628. |
Which one of the following salt give green coloured flame when the salt is tested by Pt wire |
| A. | Barium salt |
| B. | Calcium salt |
| C. | Borate |
| D. | Lead salt |
| Answer» B. Calcium salt | |
| 2629. |
When concentrated \[{{H}_{2}}S{{O}_{4}}\] is added to dry \[KN{{O}_{3}}\], brown fumes evolve. These fumes are [CPMT 1988; IIT 1987] |
| A. | \[S{{O}_{2}}\] |
| B. | \[S{{O}_{3}}\] |
| C. | \[NO\] |
| D. | \[N{{O}_{2}}\] |
| Answer» E. | |
| 2630. |
The metal that does not give the borax bead test is [BHU 1987; AFMC 1995; MHCET 2003] |
| A. | Cr |
| B. | \[Ni\] |
| C. | \[Na\] |
| D. | \[Mn\] |
| Answer» D. \[Mn\] | |
| 2631. |
In borax bead test, which of the following compound is formed [CBSE PMT 2002] |
| A. | Meta borate |
| B. | Tetra borate |
| C. | Double oxide |
| D. | Ortho borate |
| Answer» B. Tetra borate | |
| 2632. |
In which of the following molecule is the covalent bond most polar [AMU 1985; MP PET 2001] |
| A. | \[HI\] |
| B. | \[HBr\] |
| C. | \[HCl\] |
| D. | \[{{H}_{2}}\] |
| Answer» D. \[{{H}_{2}}\] | |
| 2633. |
Two electrons of one atom A and two electrons of another atom B are utilized to form a compound AB. This is an example of [MNR 1981] |
| A. | Polar covalent bond |
| B. | Non-polar covalent bond |
| C. | Polar bond |
| D. | Dative bond |
| Answer» B. Non-polar covalent bond | |
| 2634. |
The bonds between \[P\] atoms and \[Cl\] atoms in \[PC{{l}_{5}}\] are likely to be [MP PMT 1987] |
| A. | Ionic with no covalent character |
| B. | Covalent with some ionic character |
| C. | Covalent with no ionic character |
| D. | Ionic with some metallic character |
| Answer» C. Covalent with no ionic character | |
| 2635. |
Polarization is the distortion of the shape of an anion by an adjacently placed cation. Which of the following statements is correct [NCERT 1982] |
| A. | Maximum polarization is brought about by a cation of high charge |
| B. | Minimum polarization is brought about by a cation of low radius |
| C. | A large cation is likely to bring about a large degree of polarization |
| D. | A small anion is likely to undergo a large degree of polarization |
| Answer» B. Minimum polarization is brought about by a cation of low radius | |
| 2636. |
Which of the following liquids is not deflected by a non-uniform electrostatic field [NCERT 1978] |
| A. | Water |
| B. | Chloroform |
| C. | Nitrobenzene |
| D. | Hexane |
| Answer» E. | |
| 2637. |
If the electron pair forming a bond between two atoms A and B is not in the centre, then the bond is [AIIMS 1984] |
| A. | Single bond |
| B. | Polar bond |
| C. | Non-polar bond |
| D. | \[\pi \]bond |
| Answer» C. Non-polar bond | |
| 2638. |
Bond polarity of diatomic molecule is because of [UPSEAT 2002] |
| A. | Difference in electron affinities of the two atoms |
| B. | Difference in electronegativities of the two atoms |
| C. | Difference in ionisation potential |
| D. | All of these |
| Answer» C. Difference in ionisation potential | |
| 2639. |
Amongst LiCl, RbCl, \[BeC{{l}_{2}}\] and \[MgC{{l}_{2}}\] the compounds with the greatest and the least ionic character, respectively, are [UPSEAT 2002] |
| A. | LiCl and RbCl |
| B. | RbCl and \[BeC{{l}_{2}}\] |
| C. | RbCl and \[MgC{{l}_{2}}\] |
| D. | \[MgC{{l}_{2}}\] and \[BeC{{l}_{2}}\] |
| Answer» C. RbCl and \[MgC{{l}_{2}}\] | |
| 2640. |
Pauling?s electronegativity values for elements are useful in predicting [UPSEAT 2004] |
| A. | Polarity of bonds in molecules |
| B. | Position of elements in electrochemical series |
| C. | Co-ordination number |
| D. | Dipole moment of various molecules |
| Answer» B. Position of elements in electrochemical series | |
| 2641. |
Which of the following compounds has least dipole moment [RPET 2003] |
| A. | \[P{{H}_{3}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[B{{F}_{3}}\] |
| Answer» E. | |
| 2642. |
Which of the following has zero dipole moment [MP PMT 2002] |
| A. | ClF |
| B. | \[PC{{l}_{3}}\] |
| C. | \[Si{{F}_{4}}\] |
| D. | \[CFC{{l}_{3}}\] |
| Answer» D. \[CFC{{l}_{3}}\] | |
| 2643. |
Which of the following is a polar compound [AIIMS 2001] |
| A. | HF |
| B. | HCl |
| C. | \[HN{{O}_{3}}\] |
| D. | \[{{H}_{2}}S{{O}_{4}}\] |
| Answer» B. HCl | |
| 2644. |
Which one is polar molecule among the following |
| A. | \[C{{O}_{2}}\] |
| B. | \[CC{{l}_{4}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[C{{H}_{4}}\] |
| Answer» D. \[C{{H}_{4}}\] | |
| 2645. |
The \[ICl\] molecule is [DPMT 2001] |
| A. | Purely electrovalent |
| B. | Purely covalent |
| C. | Polar with negative end on iodine |
| D. | Polar with negative end on chlorine |
| Answer» E. | |
| 2646. |
Choose the correct statement [RPMT 2000] |
| A. | Amino polarisation is more pronounced by highly charged cation |
| B. | Small cation has minimum capacity to polarise an anion. |
| C. | Small anion has maximum polarizability |
| D. | None of these |
| Answer» B. Small cation has minimum capacity to polarise an anion. | |
| 2647. |
Which of the following statements is correct [AMU 1999] |
| A. | \[S{{F}_{4}}\]is polar and non-reactive |
| B. | \[S{{F}_{6}}\]is non-polar and very reactive |
| C. | \[S{{F}_{6}}\]is a strong fluorinating agent |
| D. | \[S{{F}_{4}}\]is prepared by fluorinating \[SC{{l}_{2}}\]with \[NaF\] |
| Answer» C. \[S{{F}_{6}}\]is a strong fluorinating agent | |
| 2648. |
According to Fajan?s rule, covalent bond is favoured by [AIIMS 1999] |
| A. | Large cation and small anion |
| B. | Large cation and large anion |
| C. | Small cation and large anion |
| D. | Small cation and small anion |
| Answer» D. Small cation and small anion | |
| 2649. |
Polarisibility of halide ions increases in the order [DCE 1999] |
| A. | \[{{F}^{-}},\,\,{{I}^{-}},\,\,B{{r}^{-}},\,\,C{{l}^{-}}\] |
| B. | \[C{{l}^{-}},\,\,B{{r}^{-}},\,\,\,{{I}^{-}},\,\,\,{{F}^{-}}\] |
| C. | \[{{I}^{-}},\,\,B{{r}^{-}},\,\,C{{l}^{-}},\,\,{{F}^{-}}\] |
| D. | \[{{F}^{-}},\,\,C{{l}^{-}},\,\,B{{r}^{-}},\,\,{{I}^{-}}\] |
| Answer» E. | |
| 2650. |
Which of the following has a high polarising power [CET Pune 1998] |
| A. | \[M{{g}^{2+}}\] |
| B. | \[A{{l}^{3+}}\] |
| C. | \[N{{a}^{+}}\] |
| D. | \[C{{a}^{2+}}\] |
| Answer» C. \[N{{a}^{+}}\] | |