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.
| 7551. |
Which of the following statements regarding catalyst is not true [CPMT 1983, 84; MNR 1993; KCET 1999] |
| A. | A catalyst remains unchanged in composition and quantity at the end of the reaction |
| B. | A catalyst can initiate a reaction |
| C. | A catalyst does not alter the equilibrium in a reversible reaction |
| D. | Catalyst are sometimes very specific in respect of reaction |
| Answer» C. A catalyst does not alter the equilibrium in a reversible reaction | |
| 7552. |
According to Lewis concept which one of the following is not a base [MP PET/PMT 1988; Pb. CET 2003] |
| A. | \[O{{H}^{-}}\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[A{{g}^{+}}\] |
| D. | \[N{{H}_{3}}\] |
| Answer» D. \[N{{H}_{3}}\] | |
| 7553. |
Butter is [MP PMT 1990] |
| A. | A gel |
| B. | An emulsion |
| C. | A sol |
| D. | Not a colloid |
| Answer» B. An emulsion | |
| 7554. |
Which one of the following is known as lunar caustic when in fused state [MP PMT 1999; JIPMER 2002] |
| A. | Silver nitrate |
| B. | Silver sulphate |
| C. | Silver chloride |
| D. | Sodium sulphate |
| Answer» B. Silver sulphate | |
| 7555. |
Identify the statement that is not correct as far as structure of diborane is concerned [Pb. PMT 1998] |
| A. | There are two bridging hydrogen atoms in diborane |
| B. | Each boron atom forms four bonds in diborane |
| C. | The hydrogen atoms are not in the same plane in diborane |
| D. | All B - H bonds in diborane are similar |
| Answer» E. | |
| 7556. |
Example of \[s{{p}^{2}}\] hybridization is [CPMT 1997] |
| A. | \[CH_{3}^{+}\] |
| B. | \[C{{H}_{3}}\] |
| C. | \[{{C}_{2}}H_{5}^{+}\] |
| D. | \[{{C}_{2}}{{H}_{5}}\] |
| Answer» B. \[C{{H}_{3}}\] | |
| 7557. |
\[ZnO\] when heated with \[BaO\] at \[1100{}^\circ C\] gives a compound. Identify the compound [AFMC 2002] |
| A. | \[BaZn{{O}_{2}}\] |
| B. | \[Ba{{O}_{2}}+Zn\] |
| C. | \[BaCd{{O}_{2}}\] |
| D. | \[Ba+Zn{{O}_{2}}\] |
| Answer» B. \[Ba{{O}_{2}}+Zn\] | |
| 7558. |
Silicon dioxide is formed by the reaction of [KCET (Med.) 2001] |
| A. | \[SiC{{l}_{4}}+2{{H}_{2}}O\] |
| B. | \[{{N}_{2}}\] |
| C. | \[Si{{O}_{2}}+NaOH\] |
| D. | \[SiC{{l}_{4}}+NaOH\] |
| Answer» B. \[{{N}_{2}}\] | |
| 7559. |
A hydrocarbon X adds on one mole of hydrogen to give another hydrocarbon and decolourised bromine water. X reacts with \[KMn{{O}_{4}}\]in presence of acid to give two moles of the same carboxylic acid. The structure of X is [JIPMER 2001] |
| A. | \[C{{H}_{2}}=CH-C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}-CH=CHC{{H}_{3}}\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}CH=CHC{{H}_{2}}C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}CH=CHC{{H}_{2}}C{{H}_{2}}C{{H}_{3}}\] |
| Answer» D. \[C{{H}_{3}}CH=CHC{{H}_{2}}C{{H}_{2}}C{{H}_{3}}\] | |
| 7560. |
\[4{{K}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\text{heat}}4{{K}_{2}}Cr{{O}_{4}}+3{{O}_{2}}+X\]. In the above reaction X is [DCE 2004] |
| A. | \[Cr{{O}_{3}}\] |
| B. | \[C{{r}_{2}}{{O}_{7}}\] |
| C. | \[C{{r}_{2}}{{O}_{3}}\] |
| D. | \[Cr{{O}_{5}}\] |
| Answer» D. \[Cr{{O}_{5}}\] | |
| 7561. |
If \[900\,J/g\] of heat is exchanged at boiling point of water, then what is increase in entropy [BHU 1998] |
| A. | 43.4 J/mole |
| B. | 87.2 J/mole |
| C. | 900 J/mole |
| D. | Zero |
| Answer» B. 87.2 J/mole | |
| 7562. |
In a spontaneous process, the entropy of the system and its surroundings [MP PET 1996; NCERT 1975] |
| A. | Equals zero |
| B. | Decreases |
| C. | Increases |
| D. | Remains constant |
| Answer» D. Remains constant | |
| 7563. |
The attacking (electrophilic) species in sulphonation of benzene is [RPMT 1997; CPMT 1999, 2002] |
| A. | \[S{{O}_{2}}\] |
| B. | \[S{{O}_{3}}\] |
| C. | \[SO_{4}^{2-}\] |
| D. | \[HSO_{3}^{-}\] |
| Answer» C. \[SO_{4}^{2-}\] | |
| 7564. |
What happens when naphthalene balls are put inside kerosene [Kerala (Med.) 2002] |
| A. | Precipitates |
| B. | Dissolves upon heating |
| C. | Dissolves easily |
| D. | Does not dissolve |
| E. | None of these |
| Answer» D. Does not dissolve | |
| 7565. |
\[\alpha \]-rays have high ionization power because they possess [CPMT 1982] |
| A. | Lesser kinetic energy |
| B. | Higher kinetic energy |
| C. | Lesser penetrating power |
| D. | Higher penetrating power |
| Answer» C. Lesser penetrating power | |
| 7566. |
A hydrocarbon contains 86% carbon, 488ml of the hydrocarbon weight 1.68 g at STP. Then the hydrocarbon is an |
| A. | Alkane |
| B. | Alkene |
| C. | Alkyne |
| D. | Arene |
| Answer» C. Alkyne | |
| 7567. |
Substances whose solutions can readily diffuse through parchment membranes are [CPMT 1984] |
| A. | Colloids |
| B. | Crystalloids |
| C. | Electrolytes |
| D. | Non-electrolytes |
| Answer» C. Electrolytes | |
| 7568. |
Colour is imported to glass by mixing [Pb. PMT 2002] |
| A. | Synthetic dyes |
| B. | Metal oxide |
| C. | Oxides of non-metal |
| D. | Coloured salt |
| Answer» C. Oxides of non-metal | |
| 7569. |
Oxygen gas can be prepared from solid \[KMn{{O}_{4}}\] by [DPMT 2001] |
| A. | Strongly heating the solid |
| B. | Treating the solid with \[{{H}_{2}}\] gas |
| C. | Dissolving the solid in dil. \[{{H}_{2}}S{{O}_{4}}\] |
| D. | Dissolving the solid in dil. \[HCl\] |
| Answer» B. Treating the solid with \[{{H}_{2}}\] gas | |
| 7570. |
Who observed that when the nucleus of uranium atom was bombarded with fast moving neutrons, it becomes so very unstable that it is immediately broken into two nuclei of nearly equal mass besides other fragments |
| A. | J.J. Thomson |
| B. | Chadwick |
| C. | Einstein |
| D. | Hahn and Strassmann |
| Answer» E. | |
| 7571. |
The temperature of the system decreases in an [KCET 2005] |
| A. | Adiabatic compression |
| B. | Isothermal compression |
| C. | Isothermal expansion |
| D. | Adiabatic expansion |
| Answer» E. | |
| 7572. |
A copper coin is completely covered with a gold film and is placed in dilute \[HN{{O}_{3}}\]. This will result in formation of [CPMT 1981] |
| A. | Gold nitrate |
| B. | Copper nitrate |
| C. | None of these |
| D. | Purple of cassins |
| Answer» D. Purple of cassins | |
| 7573. |
Which is not a polymer [DPMT 2005] |
| A. | Sucrose |
| B. | Enzyme |
| C. | Starch |
| D. | Teflon |
| Answer» B. Enzyme | |
| 7574. |
If monosaccharide contains an aldehyde group, it is known as |
| A. | Epimer |
| B. | Osones |
| C. | Osazone |
| D. | Aldose |
| Answer» E. | |
| 7575. |
Which of the following factors tends to increase the stability of metal ion complexes |
| A. | Higher ionic radius of the metal ion |
| B. | Higher charge/size ratio of the metal ion |
| C. | Lower ionisation potential of the metal ion |
| D. | Lower basicity of the ligand |
| Answer» C. Lower ionisation potential of the metal ion | |
| 7576. |
An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be [CPMT 1980] |
| A. | 26 |
| B. | 30 |
| C. | 36 |
| D. | 56 |
| Answer» C. 36 | |
| 7577. |
Which one of the following statements shows the correct percentage of carbon in steel, pig iron and wrought iron |
| A. | Steel containing less than 0.15% carbon; wrought iron 0.15 to 2.0% carbon; and pig iron over 2% carbon |
| B. | Pig iron less than 0.15% carbon; wrought iron 0.15 to 2.0% carbon; and steel over 2% carbon |
| C. | Wrought iron less than 0.15% carbon; steel 0.15 to 2.0% carbon; and pig iron over 2% carbon |
| D. | Wrought iron less than 0.15% carbon; pig iron 0.15 to 2.0% carbon; and steel over 2.0% carbon |
| Answer» D. Wrought iron less than 0.15% carbon; pig iron 0.15 to 2.0% carbon; and steel over 2.0% carbon | |
| 7578. |
Which of the following reactions will yield 2, 2-dibromopropane [MNR 1993; UPSEAT 2001] |
| A. | \[HC\equiv CH+2HBr\to \] |
| B. | \[C{{H}_{3}}C\equiv CH+2HBr\to \] |
| C. | \[C{{H}_{3}}CH=C{{H}_{2}}+HBr\to \] |
| D. | \[C{{H}_{3}}CH=CHBr+HBr\to \] |
| Answer» C. \[C{{H}_{3}}CH=C{{H}_{2}}+HBr\to \] | |
| 7579. |
\[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\underset{HBr}{\mathop{\xrightarrow{AlC{{l}_{3}}}}}\,\text{Product}\]. Product in above reaction is [RPMT 2003] |
| A. | \[C{{H}_{3}}-\underset{Br\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{CH\,}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{3}}\] |
| C. | \[\underset{Br\,\,\,\,}{\mathop{\underset{\,\,|\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,-C{{H}_{2}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,\] |
| D. | All of these |
| Answer» C. \[\underset{Br\,\,\,\,}{\mathop{\underset{\,\,|\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,-C{{H}_{2}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,\] | |
| 7580. |
On addition of ammonium chloride to a solution of ammonium hydroxide [CPMT 1976, 80, 81, 99; NCERT 1976, 77; MP PMT 1989, 99; DPMT 1983] |
| A. | Dissociation of \[N{{H}_{4}}OH\]increases |
| B. | Concentration of \[O{{H}^{-}}\]increases |
| C. | Concentration of \[O{{H}^{-}}\]decreases |
| D. | Concentration of \[NH_{4}^{+}\] and \[O{{H}^{-}}\]increases |
| Answer» D. Concentration of \[NH_{4}^{+}\] and \[O{{H}^{-}}\]increases | |
| 7581. |
At isoelectric point |
| A. | Colloidal sol becomes highly stable |
| B. | Precipitation of a colloidal sol takes place |
| C. | Colloidal particles becomes uncharged |
| D. | Peptization can be carried out |
| Answer» D. Peptization can be carried out | |
| 7582. |
An emulsifier is a substance which [KCET 2005] |
| A. | Stabilises the emulsion |
| B. | Homogenises the emulsion |
| C. | Coagulates the emulsion |
| D. | Accelerates the dispersion of liquid in liquid |
| Answer» B. Homogenises the emulsion | |
| 7583. |
Radioactive disintegration differs from a chemical change in being [MNR 1991] |
| A. | An exothermic change |
| B. | A spontaneous process |
| C. | A nuclear process |
| D. | A unimolecular first order reaction |
| Answer» D. A unimolecular first order reaction | |
| 7584. |
Aluminium is not used [DPMT 2002] |
| A. | In silvery paints |
| B. | For making utensils |
| C. | As a reducing agent |
| D. | As oxidizer in metallurgy |
| Answer» E. | |
| 7585. |
Alum helps in purifying water by [AIEEE 2002] |
| A. | Forming Si complex with clay particles |
| B. | Sulphate part which combines with the dirt and removes it |
| C. | Aluminium which coagulates the mud particles |
| D. | Making mud water soluble |
| Answer» D. Making mud water soluble | |
| 7586. |
Chrome green is |
| A. | Chromium sulphate |
| B. | Chromium chloride |
| C. | Chromium nitrate |
| D. | Chromium oxide |
| Answer» E. | |
| 7587. |
Volume of a gas at STP is \[1.12\times {{10}^{-7}}\]cc. Calculate the number of molecules in it [BHU 1997] |
| A. | \[3.01\times {{10}^{20}}\] |
| B. | \[3.01\times {{10}^{12}}\] |
| C. | \[3.01\times {{10}^{23}}\] |
| D. | \[3.01\times {{10}^{24}}\] |
| Answer» C. \[3.01\times {{10}^{23}}\] | |
| 7588. |
Glucose and mannose are [Orissa JEE 2004] |
| A. | Epimers |
| B. | Anomers |
| C. | Ketohexoses |
| D. | Disaccharides |
| Answer» B. Anomers | |
| 7589. |
\[\underset{CH}{\mathop{\overset{CH}{\mathop{|\,|\,|}}\,}}\,\xrightarrow{{{O}_{3}}/NaOH}X\xrightarrow{Zn/C{{H}_{3}}COOH}Y\] ?Y? is [AIIMS 1988] |
| A. | \[\underset{C{{H}_{2}}OH}{\mathop{\overset{C{{H}_{2}}OH}{\mathop{\,|\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}}\,\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| C. | \[C{{H}_{3}}COOH\] |
| D. | \[C{{H}_{3}}OH\] |
| Answer» B. \[C{{H}_{3}}C{{H}_{2}}OH\] | |
| 7590. |
Fusion bomb involves [AFMC 2004] |
| A. | Combination of lighter nuclei into bigger nucleus |
| B. | Destruction of heavy nucleus into smaller nuclei |
| C. | Combustion of oxygen |
| D. | Explosion of TNT |
| Answer» B. Destruction of heavy nucleus into smaller nuclei | |
| 7591. |
Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be [CBSE PMT 1993] |
| A. | 100 ml |
| B. | 20 ml |
| C. | 40 ml |
| D. | 60 ml |
| Answer» C. 40 ml | |
| 7592. |
A reaction attains equilibrium when the free energy change accompanying it is [KCET 1989] |
| A. | Positive and large |
| B. | Zero |
| C. | Negative and large |
| D. | Negative and small |
| Answer» C. Negative and large | |
| 7593. |
The pH is less than 7, of the solution of [Pb. PMT 2002; MP PMT 2003] |
| A. | \[FeC{{l}_{3}}\] |
| B. | \[NaCN\] |
| C. | \[NaOH\] |
| D. | \[NaCl\] |
| Answer» B. \[NaCN\] | |
| 7594. |
\[{{1}^{o}}C\] rise in temperature is equal to a rise of |
| A. | \[{{1}^{o}}F\] |
| B. | \[9/{{5}^{o}}F\] |
| C. | \[5/{{9}^{o}}F\] |
| D. | \[{{33}^{o}}F\] |
| Answer» C. \[5/{{9}^{o}}F\] | |
| 7595. |
Which one of the following would produce maximum elevation in boiling point [MP PMT 1985; CPMT 1990; NCERT 1982] |
| A. | 0.1 M glucose |
| B. | 0.2 M sucrose |
| C. | 0.1 M barium chloride |
| D. | 0.1 M magnesium sulphate |
| Answer» D. 0.1 M magnesium sulphate | |
| 7596. |
The solution of strong acid and weak base \[N{{H}_{4}}Cl\]is [MADT Bihar 1981; CPMT 1979, 83, 84] |
| A. | Acidic |
| B. | Basic |
| C. | Neutral |
| D. | None of the above |
| Answer» B. Basic | |
| 7597. |
The conjugate base of sulphuric acid is [EAMCET 1974] |
| A. | Sodium hydroxide |
| B. | Hydrochloric acid |
| C. | Bisulphate ion |
| D. | Barium hydroxide |
| Answer» D. Barium hydroxide | |
| 7598. |
Prussian blue is formed when [CBSE PMT 1990] |
| A. | Ferrous sulphate reacts with \[FeC{{l}_{3}}\] |
| B. | Ferric sulphate reacts with \[{{K}_{4}}\left[ Fe{{(CN)}_{6}} \right]\] |
| C. | Ferrous ammonium sulphate reacts with \[FeC{{l}_{3}}\] |
| D. | Ammonium sulphate reacts with \[FeC{{l}_{3}}\] |
| Answer» C. Ferrous ammonium sulphate reacts with \[FeC{{l}_{3}}\] | |
| 7599. |
Glycolysis is [CBSE PMT 2003] |
| A. | Conversion of glucose to haem |
| B. | Oxidation of glucose to glutamate |
| C. | Conversion of pyruvate to citrate |
| D. | Oxidation of glucose to pyruvate |
| Answer» E. | |
| 7600. |
The correct formula of permanganic acid is [MP PET 1999] |
| A. | \[HMn{{O}_{4}}\] |
| B. | \[HMn{{O}_{5}}\] |
| C. | \[{{H}_{2}}Mn{{O}_{4}}\] |
| D. | \[{{H}_{2}}Mn{{O}_{3}}\] |
| Answer» B. \[HMn{{O}_{5}}\] | |