MCQOPTIONS
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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.
| 7751. |
Of the following the formula which represents a saturated cyclic compound is [AMU 1983] |
| A. | \[{{C}_{3}}{{H}_{6}}\] |
| B. | \[{{C}_{3}}{{H}_{8}}\] |
| C. | \[{{C}_{8}}{{H}_{10}}\] |
| D. | \[{{C}_{8}}{{H}_{12}}\] |
| Answer» B. \[{{C}_{3}}{{H}_{8}}\] | |
| 7752. |
Dilute aqueous \[KMn{{O}_{4}}\], at room temperature reacts with \[\text{ }R-CH=CH-R\]to give [Roorkee 1992] |
| A. | R - CHO |
| B. | R - COOH |
| C. | RCHOH - CHOHR |
| D. | \[C{{O}_{2}}+{{H}_{2}}O\] |
| Answer» D. \[C{{O}_{2}}+{{H}_{2}}O\] | |
| 7753. |
According to the adsorption theory of catalysis, the speed of the reaction increases because [CBSE PMT 2003] |
| A. | Adsorption lowers the activation energy of the reaction |
| B. | The concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption |
| C. | In the process of adsorption, the activation energy of the molecules becomes large |
| D. | Adsorption produces heat which increases the speed of the reaction |
| Answer» B. The concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption | |
| 7754. |
In which of the following, the bond length between carbon and carbon atom is equal [CPMT 1997] |
| A. | 2-butene |
| B. | Benzene |
| C. | 1-butene |
| D. | 1-propyne |
| Answer» C. 1-butene | |
| 7755. |
1, 2-dibromoethane when heated with alcoholic potash gives [Kerala PMT 2004] |
| A. | Ethane |
| B. | Acetylene |
| C. | Ethylene |
| D. | Methane |
| E. | None of these |
| Answer» C. Ethylene | |
| 7756. |
Size of colloidal particle is [BCECE 2005] |
| A. | 1 nm |
| B. | 1 ? 100 nm |
| C. | > 100 nm |
| D. | > 1000 nm |
| Answer» C. > 100 nm | |
| 7757. |
Super conductors are derived from compounds of [Kerala (Engg.) 2002] |
| A. | p-block elements |
| B. | Lanthanides |
| C. | Actinides |
| D. | Transition elements |
| Answer» E. | |
| 7758. |
In which radiation mass number and atomic number will not change [JEE Orissa 2004] |
| A. | \[\alpha \] |
| B. | \[\beta \] |
| C. | \[\gamma \] |
| D. | \[\alpha \] and \[2\beta \] |
| Answer» D. \[\alpha \] and \[2\beta \] | |
| 7759. |
One of the following metals forms a volatile compound and this property is taken advantage for its extraction. This metal is [NCERT 1984] |
| A. | Iron |
| B. | Nickel |
| C. | Cobalt |
| D. | Tungsten |
| Answer» C. Cobalt | |
| 7760. |
Which one is not a conductor of electricity [RPET 1999] |
| A. | \[NaCl\](aqueous) |
| B. | \[NaCl\] (solid) |
| C. | \[NaCl\] (molten) |
| D. | \[Ag\] metal |
| Answer» C. \[NaCl\] (molten) | |
| 7761. |
Which one of the following is reduced by hydrogen peroxide in acid medium [EAMCET 1997] |
| A. | Potassium permanganate |
| B. | Potassium iodide |
| C. | Ferrous sulphate |
| D. | Potassium ferrocyanide |
| Answer» B. Potassium iodide | |
| 7762. |
Number of ions present in \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] [Pb. CET 2000] |
| A. | 2 |
| B. | 10 |
| C. | 3 |
| D. | 5 |
| Answer» E. | |
| 7763. |
Starch can be used as an indicator for the detection of traces of [CPMT 1986] |
| A. | Glucose in aqueous solution |
| B. | Protein in blood |
| C. | Iodine in aqueous solution |
| D. | Urea in blood |
| Answer» D. Urea in blood | |
| 7764. |
Which one is a polymer compound [CPMT 1997; Bihar MEE 1997] |
| A. | \[S{{O}_{2}}\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[C{{H}_{4}}\] |
| D. | PVC |
| Answer» E. | |
| 7765. |
Maltose contains how many oxygen atoms |
| A. | 6 |
| B. | 10 |
| C. | 11 |
| D. | 22 |
| Answer» D. 22 | |
| 7766. |
Formation of ammonia from \[{{H}_{2}}\] and \[{{N}_{2}}\] by Haber's process using \[Fe\] is an example of [J & K 2005] |
| A. | Heterogeneous catalysis |
| B. | Homogeneous catalysis |
| C. | Enzyme catalysis |
| D. | Non-catalytic process |
| Answer» B. Homogeneous catalysis | |
| 7767. |
Which of the following is a polyamide [AIEEE 2005] |
| A. | Teflon |
| B. | Nylon ?66 |
| C. | Terylene |
| D. | Bakelite |
| Answer» C. Terylene | |
| 7768. |
In the trinitrocellulose each glucose unit contains how many \[-OH\] groups |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 7769. |
Which of the following is not true for ligand-metal complex [MP PET 1993] |
| A. | Larger the ligand, the more stable is the metal-ligand bond |
| B. | Highly charged ligand forms strong bond |
| C. | Larger the permanent dipole moment of ligand, the more stable is the bond |
| D. | Greater the ionization potential of central metal, the stronger is the bond |
| Answer» C. Larger the permanent dipole moment of ligand, the more stable is the bond | |
| 7770. |
Polythene is |
| A. | Thermoplastic |
| B. | Thermosetting |
| C. | Both A and B |
| D. | None of these |
| Answer» B. Thermosetting | |
| 7771. |
Which of the following statement is correct with respect to the property of elements in the carbon family with an increase in atomic number, their [Pb. CET 2002] |
| A. | Atomic size decreases |
| B. | Ionization energy increases |
| C. | Metallic character decreases |
| D. | Stability of +2 oxidation state increases |
| Answer» E. | |
| 7772. |
For gold plating, the electrolyte used is [Pb.CET 2004] |
| A. | \[AuC{{l}_{3}}\] |
| B. | \[HAuC{{l}_{4}}\] |
| C. | \[k[Au{{(CN)}_{2}}]\] |
| D. | None of these |
| Answer» D. None of these | |
| 7773. |
Which is most readily nitrated [Roorkee 1992] |
| A. | Benzene |
| B. | Phenol |
| C. | Aniline |
| D. | Nitrobenzene |
| Answer» C. Aniline | |
| 7774. |
In alkanes, the bond angle is [MP PMT 1989; BHU 1996] |
| A. | \[{{109.5}^{o}}\] |
| B. | \[{{109}^{o}}\] |
| C. | \[{{120}^{o}}\] |
| D. | \[{{180}^{o}}\] |
| Answer» B. \[{{109}^{o}}\] | |
| 7775. |
Which of the following has the highest boiling point [DPMT 1986] |
| A. | Neopentane |
| B. | n-butane |
| C. | n-heptane |
| D. | Isobutane |
| Answer» D. Isobutane | |
| 7776. |
Molar heat of neutralization of \[NaOH\] with \[HCl\] in comparison to that of \[KOH\] with \[HN{{O}_{3}}\]is [MP PMT 1989] |
| A. | Less |
| B. | More |
| C. | Equal |
| D. | Depends on pressure |
| Answer» D. Depends on pressure | |
| 7777. |
In Wurtz reaction, the reagent used is [EAMCET 1998] |
| A. | Na |
| B. | \[{Na}/{\text{liquid }N{{H}_{3}}}\;\] |
| C. | \[{Na}/{\text{dry ether}}\;\] |
| D. | \[{Na}/{\text{dry alcohol}}\;\] |
| Answer» D. \[{Na}/{\text{dry alcohol}}\;\] | |
| 7778. |
Presence of peroxides affects the addition of [BHU 1987] |
| A. | HBr |
| B. | HCl |
| C. | HI |
| D. | All of these |
| Answer» B. HCl | |
| 7779. |
A carbohydrate consists of [NCERT 1971] |
| A. | C and O |
| B. | \[C,\,\,H\] and O |
| C. | \[C,\,\,H,\,\,N\] and O |
| D. | C and H |
| Answer» C. \[C,\,\,H,\,\,N\] and O | |
| 7780. |
Which of the following are isoelectronic and isostructural \[NO_{3}^{-},\,CO_{3}^{2-},\,ClO_{3}^{-},\,S{{O}_{3}}\] [IIT Screening 2003] |
| A. | \[NO_{3}^{-},\,CO_{3}^{2-}\] |
| B. | \[S{{O}_{3}},\,NO_{3}^{-}\] |
| C. | \[ClO_{3}^{-},\,CO_{3}^{2-}\] |
| D. | \[CO_{3}^{2-},\,S{{O}_{3}}\] |
| Answer» B. \[S{{O}_{3}},\,NO_{3}^{-}\] | |
| 7781. |
In acetylene molecule, the two carbon atoms are linked by [KCET 2004] |
| A. | One sigma bond and two pi bonds |
| B. | Two sigma bonds and one pi bond |
| C. | Three sigma bonds |
| D. | Three pi bonds |
| Answer» B. Two sigma bonds and one pi bond | |
| 7782. |
Equimolar solutions in the same solvent have [AIEEE 2005] |
| A. | Same boiling point but different freezing point |
| B. | Same freezing point but different boiling point |
| C. | Same boiling and same freezing points |
| D. | Different boiling and different freezing points |
| Answer» D. Different boiling and different freezing points | |
| 7783. |
Which of the following metal gives more than one chloride |
| A. | \[Cu\] |
| B. | \[Al\] |
| C. | \[Ag\] |
| D. | \[Na\] |
| Answer» B. \[Al\] | |
| 7784. |
In alkaline condition \[KMn{{O}_{4}},\] reacts as follows : \[2KMn{{O}_{4}}+2KOH\to 2{{K}_{2}}Mn{{O}_{4}}+{{H}_{2}}O+O\] Therefore its equivalent weight will be [NCERT 1974; CPMT 1977; DCE 2002] |
| A. | 31.5 |
| B. | 52.7 |
| C. | 72 |
| D. | 158 |
| Answer» E. | |
| 7785. |
Ethylene possess [RPET 1999] |
| A. | Two sigma and two pi bonds |
| B. | Two pi bonds |
| C. | Five sigma and one pi bond |
| D. | Four sigma and one pi bond |
| Answer» D. Four sigma and one pi bond | |
| 7786. |
The structure of orthophosphoric acid is [KCET 2003] |
| A. | \[H-O-\overset{\,O\,}{\mathop{\underset{H}{\mathop{\underset{|\,}{\mathop{\underset{\,O\,}{\mathop{\underset{|\,}{\overset{\uparrow \,}{\mathop{P}}}\,}}\,}}\,}}\,}}\,-O-H\] |
| B. | \[O\leftarrow \underset{\,H\,}{\mathop{\underset{|\,}{\mathop{\underset{\,O\,}{\overset{\,H\,}{\mathop{\underset{|\,}{\overset{|}{\mathop{P}}}\,}}}\,}}\,}}\,-O-H\] |
| C. | \[O\leftarrow \underset{H\,}{\overset{H}{\mathop{\underset{|\,\,\,}{\overset{|\,\,}{\mathop{P\,}}}\,}}}\,-O-H\]\[\] |
| D. | \[H-O-\overset{\,O}{\mathop{\overset{\uparrow }{\mathop{P}}\,}}\,=O\]\[\] |
| Answer» B. \[O\leftarrow \underset{\,H\,}{\mathop{\underset{|\,}{\mathop{\underset{\,O\,}{\overset{\,H\,}{\mathop{\underset{|\,}{\overset{|}{\mathop{P}}}\,}}}\,}}\,}}\,-O-H\] | |
| 7787. |
Sucrose contains which of the following groups |
| A. | \[-CHO\] |
| B. | \[>C=O\] |
| C. | Both A and B |
| D. | None of these |
| Answer» E. | |
| 7788. |
In photography sodium thiosulphate is used as [DPMT 2005] |
| A. | Complexing agent |
| B. | Oxidising agent |
| C. | Reducing agent |
| D. | None of these |
| Answer» B. Oxidising agent | |
| 7789. |
Natural gas is a mixture of [MP PMT 1986] |
| A. | \[CO+C{{O}_{2}}\] |
| B. | \[CO+{{N}_{2}}\] |
| C. | \[CO+{{H}_{2}}+C{{H}_{4}}\] |
| D. | \[C{{H}_{4}}+{{C}_{2}}{{H}_{6}}+{{C}_{3}}{{H}_{8}}\] |
| Answer» E. | |
| 7790. |
Name the reaction \[{{C}_{10}}{{H}_{22}}\xrightarrow{900K}{{C}_{4}}{{H}_{8}}+{{C}_{6}}{{H}_{14}}\] [MP PET 1995; MP PMT 1997] |
| A. | Alkylation |
| B. | Cracking |
| C. | Pyrolysis |
| D. | Fractionation |
| Answer» C. Pyrolysis | |
| 7791. |
Mohr's salt is [MNR 1986] |
| A. | Normal salt |
| B. | Acid salt |
| C. | Basic salt |
| D. | Double salt |
| Answer» E. | |
| 7792. |
Triple bond of ethyne is made of or Cylindrical shape of an alkyne is due to [EAMCET 1978; NCERT 1979; CBSE PMT 1997; Manipal MEE 1995; Bihar MEE 1996] |
| A. | Three \[\sigma -\text{bonds}\] |
| B. | Three \[\pi -\text{bonds}\] |
| C. | Two \[\sigma \] and one \[\pi -\text{bond}\] |
| D. | Two \[\pi \] and one \[\sigma -\text{bond}\] |
| Answer» E. | |
| 7793. |
The end product of \[(4n+1)\] radioactive disintegration series is [MP PMT 1999] |
| A. | \[_{83}B{{i}^{209}}\] |
| B. | \[_{84}P{{o}^{210}}\] |
| C. | \[_{82}P{{b}^{208}}\] |
| D. | \[_{82}P{{b}^{207}}\] |
| Answer» B. \[_{84}P{{o}^{210}}\] | |
| 7794. |
Energy of activation of a reactant is reduced by |
| A. | Increased temperature |
| B. | Reduced temperature |
| C. | Reduced pressure |
| D. | Increased pressure |
| Answer» B. Reduced temperature | |
| 7795. |
The carbon dating is based on [MP PMT 2001] |
| A. | \[_{6}^{15}C\] |
| B. | \[_{6}^{14}C\] |
| C. | \[_{6}^{13}C\] |
| D. | \[_{6}^{11}C\] |
| Answer» C. \[_{6}^{13}C\] | |
| 7796. |
1 amu is equal to |
| A. | \[\frac{1}{12}\text{of }C-12\] |
| B. | \[\frac{1}{14}\text{of O-16}\] |
| C. | \[1g\text{ of }{{H}_{2}}\] |
| D. | \[1.66\times {{10}^{-23}}\]kg |
| Answer» B. \[\frac{1}{14}\text{of O-16}\] | |
| 7797. |
When \[KCl{{O}_{3}}\] is heated, it decomposes into \[KCl+{{O}_{2}}\]. If some \[Mn{{O}_{2}}\] is added, the reaction goes much faster because [CPMT 1971,76,80,94] |
| A. | \[Mn{{O}_{2}}\] decomposes to give \[{{O}_{2}}\] |
| B. | \[Mn{{O}_{2}}\] provides heat by reacting |
| C. | Better contact is provided by \[Mn{{O}_{2}}\] |
| D. | \[Mn{{O}_{2}}\] acts as a catalyst |
| Answer» E. | |
| 7798. |
The bond length between \[s{{p}^{3}}\] hybridised carbon atom and other carbon atom is minimum in [CBSE PMT 1996; Pb. PMT 1999] |
| A. | Propane |
| B. | Butane |
| C. | Propene |
| D. | Propyne |
| Answer» E. | |
| 7799. |
Which of the following compound has maximum boiling point [IIT-JEE 1982; MP PMT 1986; MADT Bihar 1995; Pb. PMT 1999] |
| A. | n-hexane |
| B. | n-pentane |
| C. | 2, 2-dimethyl propane |
| D. | 2-methyl butane |
| Answer» B. n-pentane | |
| 7800. |
An example of a Lewis acid is [MADT Bihar 1982; AMU 1982; MNR 1994; RPMT 1997; KCET 2000; Orissa JEE 2005] |
| A. | \[NaCl\] |
| B. | \[{{25}^{o}}C\] |
| C. | \[AlC{{l}_{3}}\] |
| D. | \[SnC{{l}_{4}}\] |
| Answer» D. \[SnC{{l}_{4}}\] | |