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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.
| 8451. |
How many methyl group are present in 2, 5-dimethyl-4-ethylheptane [EAMCET 2003] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 8452. |
Which of the following is zero during adiabatic expansion of the gas |
| A. | \[\Delta T\] |
| B. | \[\Delta S\] |
| C. | \[\Delta E\] |
| D. | None of these |
| Answer» C. \[\Delta E\] | |
| 8453. |
The unit of equivalent conductivity is [CPMT 1999; BCECE 2005] |
| A. | ohm cm |
| B. | \[oh{{m}^{-1}}c{{m}^{2}}\,{{(gm\,\ equivalent)}^{-1}}\] |
| C. | ohm \[c{{m}^{2}}\,(gm\,\,equivalent)\] |
| D. | \[S\,c{{m}^{-2}}\] |
| Answer» C. ohm \[c{{m}^{2}}\,(gm\,\,equivalent)\] | |
| 8454. |
Among the following compound which one is planar in shape [MP PMT 2000] |
| A. | Methane |
| B. | Acetylene |
| C. | Benzene |
| D. | Isobutane |
| Answer» D. Isobutane | |
| 8455. |
While writing the formula of ferrous oxide it is written as \[(FeO),\] because it is |
| A. | Non-stoichiometric |
| B. | Non-existant |
| C. | Paramagnetic |
| D. | Ferromagnetic |
| Answer» B. Non-existant | |
| 8456. |
Mohr's salt is dissolved in dil. \[{{H}_{2}}S{{O}_{4}}\] instead of distilled water to |
| A. | Enhance the rate of dissolution |
| B. | Prevent cationic hydrolysis |
| C. | Increase the rate of ionisation |
| D. | Increase its reducing strength |
| Answer» C. Increase the rate of ionisation | |
| 8457. |
The number of a and b -particles emitted during the transformation of \[_{90}T{{h}^{232}}\] to \[_{82}{{P}^{208}}\] are respectively [MNR 1978; NCERT 1984;CPMT 1989; RPET 1999; MP PMT 2001; KCET 2003] |
| A. | 4, 2 |
| B. | 2, 2 |
| C. | 8, 6 |
| D. | 6, 4 |
| Answer» E. | |
| 8458. |
Which of the following statements is correct ? Galvanic cell converts [KCET 1991; MP PMT 1993] |
| A. | Chemical energy into electrical energy |
| B. | Electrical energy into chemical energy |
| C. | Metal from its elemental state to the combined state |
| D. | Electrolyte into individual ions |
| Answer» B. Electrical energy into chemical energy | |
| 8459. |
Which of the following is used to distinguish ethylene and acetylene [MP PET 2000; KCET 2000; JIPMER 2000; CPMT 1977; NCERT 1973] |
| A. | Alkaline \[KMn{{O}_{4}}\] |
| B. | Bromine water |
| C. | Ammoniacal cuprous chloride |
| D. | Conc. \[{{H}_{2}}S{{O}_{4}}\] |
| Answer» D. Conc. \[{{H}_{2}}S{{O}_{4}}\] | |
| 8460. |
Which compound does not dissolve in hot dilute \[HN{{O}_{3}}\] [DCE 2002; NCERT 1977] |
| A. | \[HgS\] |
| B. | \[CuS\] |
| C. | \[PbS\] |
| D. | \[CdS\] |
| Answer» B. \[CuS\] | |
| 8461. |
If the solubility of a sparingly soluble salt of the type \[B{{A}_{2}}\] (giving three ions on dissociation of a molecule) is \[x\] moles per litre, then its solubility product is given by [BHU 1987] |
| A. | \[{{x}^{2}}\] |
| B. | \[2{{x}^{3}}\] |
| C. | \[4{{x}^{2}}\] |
| D. | \[4{{x}^{3}}\] |
| Answer» E. | |
| 8462. |
Amongst the following chemical reactions, the one representing homogeneous catalysis is [MP PMT 1999] |
| A. | \[{{N}_{2}}(g)+3{{H}_{2}}(g)\xrightarrow{Fe}2N{{H}_{3}}(g)\] |
| B. | \[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{2NO}2S{{O}_{3}}(g)+2NO(g)\] |
| C. | \[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\] |
| D. | \[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{{{V}_{2}}{{O}_{5}}}2S{{O}_{3}}(g)\] |
| Answer» C. \[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\] | |
| 8463. |
When atoms are bombarded with alpha particles, only a few in million suffer deflection, others pass out undeflected. This is because [MNR 1979; NCERT 1980; AFMC 1995] |
| A. | The force of repulsion on the moving alpha particle is small |
| B. | The force of attraction on the alpha particle to the oppositely charged electrons is very small |
| C. | There is only one nucleus and large number of electrons |
| D. | The nucleus occupies much smaller volume compared to the volume of the atom |
| Answer» E. | |
| 8464. |
Reaction of HBr with propene in the presence of peroxide gives [CBSE PMT 2004] |
| A. | Allyl bromide |
| B. | n-propyl bromide |
| C. | Isopropyl bromide |
| D. | 3-bromo propane |
| Answer» C. Isopropyl bromide | |
| 8465. |
An example of autocatalytic reaction is [NCERT 1983] |
| A. | The decomposition of nitroglycerine |
| B. | Thermal decomposition of \[KCl{{O}_{3}}\] and \[Mn{{O}_{2}}\] mixture |
| C. | Break down of \[_{6}{{C}^{14}}\] |
| D. | Hydrogenation of vegetable oil using nickel catalysts |
| Answer» B. Thermal decomposition of \[KCl{{O}_{3}}\] and \[Mn{{O}_{2}}\] mixture | |
| 8466. |
Why pure \[NaCl\] is precipitated when \[HCl\] gas is passed in a saturated solution of \[NaCl\] [NCERT 1977; MP PMT 1987; CPMT 1974, 78, 81] |
| A. | Impurities dissolves in \[HCl\] |
| B. | The value of \[[N{{a}^{+}}]\]and \[[C{{l}^{-}}]\] becomes smaller than \[{{K}_{sp}}\] of \[NaCl\] |
| C. | The value of \[[N{{a}^{+}}]\]and \[[C{{l}^{-}}]\] becomes greater than \[{{K}_{sp}}\] of \[NaCl\] |
| D. | \[HCl\]dissolves in the water |
| Answer» D. \[HCl\]dissolves in the water | |
| 8467. |
Which is not a colligative property [CPMT 1984; BHU 1982; Manipal MEE 1995] |
| A. | Refractive index |
| B. | Lowering of vapour pressure |
| C. | Depression of freezing point |
| D. | Elevation of boiling point |
| Answer» B. Lowering of vapour pressure | |
| 8468. |
The colloidal system consisting of a liquid adsorbent in a solid adsorbate is termed as |
| A. | Aerosol |
| B. | Sol |
| C. | Foam |
| D. | Gel |
| Answer» C. Foam | |
| 8469. |
The \[{{C}^{14}}\]to \[{{C}^{12}}\] ratio in a wooden article is 13% that of the fresh wood. Calculate the age of the wooden article. Given that the half-life of \[{{C}^{14}}\] is 5770 years [Pb.CET 2004] |
| A. | 16989 years |
| B. | 16858 years |
| C. | 15675 years |
| D. | 17700 years |
| Answer» B. 16858 years | |
| 8470. |
Vapour density of a metal chloride is 66. Its oxide contains 53% metal. The atomic weight of the metal is [Bihar MADT 1982] |
| A. | 21 |
| B. | 54 |
| C. | 27.06 |
| D. | 2.086 |
| Answer» D. 2.086 | |
| 8471. |
Ethylene reacts with bromine to form [MP PET 2001] |
| A. | \[Br-C{{H}_{2}}-C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}-CB{{r}_{3}}\] |
| C. | \[Br-C{{H}_{2}}-C{{H}_{2}}Br\] |
| D. | \[CHB{{r}_{3}}\] |
| Answer» D. \[CHB{{r}_{3}}\] | |
| 8472. |
Splitting of spectral lines under the influence of magnetic field is called [MP PET 2004] |
| A. | Zeeman effect |
| B. | Stark effect |
| C. | Photoelectric effect |
| D. | None of these |
| Answer» B. Stark effect | |
| 8473. |
\[C{{H}_{3}}-C\equiv CH\underset{Zn/{{H}_{2}}{{O}_{2}}}{\mathop{\xrightarrow{{{O}_{3}}}}}\,\text{Product}\].Product in above reaction is [RPMT 2003] |
| A. | \[C{{H}_{3}}COOH\] |
| B. | \[HCOOH\] |
| C. | Both A and B |
| D. | \[C{{H}_{3}}CHO+HCHO\] |
| Answer» D. \[C{{H}_{3}}CHO+HCHO\] | |
| 8474. |
Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be [DPMT 1984] |
| A. | 26.89 |
| B. | 8.9 |
| C. | 17.8 |
| D. | 26.7 |
| Answer» E. | |
| 8475. |
Nylone 66 is [RPMT 2002; MH CET 2003; AFMC 1998] |
| A. | Polyamide |
| B. | Polyester |
| C. | Polystyrene |
| D. | Polyvinyl |
| Answer» B. Polyester | |
| 8476. |
Which of the following ligands forms a chelate [MP PET/PMT 1998] |
| A. | Acetate |
| B. | Oxalate |
| C. | Cyanide |
| D. | Ammonia |
| Answer» E. | |
| 8477. |
The presence of \[Si\] in steel gives it |
| A. | Fibrous structure |
| B. | Silicate type structure |
| C. | Sheet type structure |
| D. | None of these |
| Answer» B. Silicate type structure | |
| 8478. |
A certain compound gives negative test with ninhydrin and positive test with Benedict's solution. The compound is [NCERT 1978; KCET 2000] |
| A. | A protein |
| B. | A monosaccharide |
| C. | A lipid |
| D. | An amino acid |
| Answer» C. A lipid | |
| 8479. |
Which of the following are isoelectronic with one another [NCERT 1983; EAMCET 1989] |
| A. | \[N{{a}^{+}}\] and \[Ne\] |
| B. | \[{{K}^{+}}\] and \[O\] |
| C. | \[Ne\] and \[O\] |
| D. | \[N{{a}^{+}}\] and \[{{K}^{+}}\] |
| Answer» B. \[{{K}^{+}}\] and \[O\] | |
| 8480. |
Carbon atoms in the compound \[{{(CN)}_{4}}{{C}_{2}}\] are [Roorkee 1999] |
| A. | sp hybridized |
| B. | \[s{{p}^{2}}\] hybridized |
| C. | sp and \[s{{p}^{2}}\] hybridized |
| D. | sp, \[s{{p}^{2}}\] and \[s{{p}^{3}}\] hybridized |
| Answer» D. sp, \[s{{p}^{2}}\] and \[s{{p}^{3}}\] hybridized | |
| 8481. |
\[Nd\,(Z=60)\] is a member of group -3 in periodic table. An isotope of it is \[\beta \]-active. The daughter nuclei will be a member of |
| A. | Group -3 |
| B. | Group - 4 |
| C. | Group -1 |
| D. | Group ? 2 |
| Answer» B. Group - 4 | |
| 8482. |
The frequency corresponding to transition \[n=2\] to \[n=1\] in hydrogen atom is [MP PET 2003] |
| A. | \[15.66\times {{10}^{10}}Hz\] |
| B. | \[24.66\times {{10}^{14}}Hz\] |
| C. | \[30.57\times {{10}^{14}}Hz\] |
| D. | \[40.57\times {{10}^{24}}Hz\] |
| Answer» C. \[30.57\times {{10}^{14}}Hz\] | |
| 8483. |
Conc. \[HN{{O}_{3}}\] |
| A. | Reacts with aluminium vigrously |
| B. | Reacts with aluminium to form aluminium nitrate |
| C. | Does not react with aluminium |
| D. | Reacts with platinum |
| Answer» D. Reacts with platinum | |
| 8484. |
The catalyst used in the lead chamber process of sulphuric acid manufacture is [CPMT 1977] |
| A. | Platinum |
| B. | Oxide of nitrogen |
| C. | Nickel |
| D. | Vanadium compounds |
| Answer» C. Nickel | |
| 8485. |
Hydrolytic conversion of sucrose into glucose and fructose is known as [BHU 1979, 97] |
| A. | Induction |
| B. | Saponification |
| C. | Inversion |
| D. | Esterification |
| Answer» D. Esterification | |
| 8486. |
Which acid will not form hydrocarbon [CPMT 1997] |
| A. | Cinnamic acid |
| B. | Isothallic acid |
| C. | Salicylic acid |
| D. | Picric acid |
| Answer» E. | |
| 8487. |
In electroplating, the article to be electroplated serves as [AMU 1982, 83] |
| A. | Cathode |
| B. | Electrolyte |
| C. | Anode |
| D. | Conductor |
| Answer» B. Electrolyte | |
| 8488. |
Which of the following shows the maximum hydrophobic behaviour [NCERT 1982] |
| A. | Glycerine |
| B. | Stearic acid |
| C. | Glucose |
| D. | Adenine |
| Answer» E. | |
| 8489. |
Which of the following is not a colligative property [MP PET 2001; CPMT 2001; Pb. CET 2001] |
| A. | Optical activity |
| B. | Elevation in boiling point |
| C. | Osmotic pressure |
| D. | Lowering of vapour pressure |
| Answer» B. Elevation in boiling point | |
| 8490. |
Cyclopentene on treatment with alkaline \[KMn{{O}_{4}}\] gives [CPMT 1987] |
| A. | Cyclopentanol |
| B. | trans 1, 2-cyclopentanediol |
| C. | cis 1, 2-cyclopentanediol |
| D. | 1 : 1 mixture of cis and trans 1, 2-cyclopentanediol |
| Answer» D. 1 : 1 mixture of cis and trans 1, 2-cyclopentanediol | |
| 8491. |
\[C{{H}_{3}}CH=CHCHO\] is oxidized to \[C{{H}_{3}}CH=CHCOOH\] using [NCERT 1978] |
| A. | Alkaline potassium permanganate |
| B. | Acidified potassium permanganate |
| C. | Selenium dioxide |
| D. | Osmium tetroxide |
| Answer» C. Selenium dioxide | |
| 8492. |
Allyl cyanide contain s- and p-bonds [MP PET 2004] |
| A. | 9s, 3p |
| B. | 9s, 9p |
| C. | 3s, 4p |
| D. | 5s, 7p |
| Answer» B. 9s, 9p | |
| 8493. |
Reaction of zinc with cold and very dilute nitric acid yields [MP PET 1985, 92, 97; BHU 1995, 2000; NCERT 1974; MP PMT 1995] |
| A. | \[Zn{{(N{{O}_{3}})}_{2}}+{{N}_{2}}O\] |
| B. | \[Zn{{(N{{O}_{3}})}_{2}}+NO\] |
| C. | \[Zn{{(N{{O}_{3}})}_{2}}+N{{H}_{4}}N{{O}_{3}}\] |
| D. | \[Zn{{(N{{O}_{3}})}_{2}}+N{{O}_{2}}\] |
| Answer» D. \[Zn{{(N{{O}_{3}})}_{2}}+N{{O}_{2}}\] | |
| 8494. |
Tyndall phenomenon is exhibited by [CPMT 1985] |
| A. | \[NaCl\] solution |
| B. | Starch solution |
| C. | Urea solution |
| D. | \[FeC{{l}_{3}}\] solution |
| Answer» C. Urea solution | |
| 8495. |
Which of the following statement is not true |
| A. | Colourless compounds of transition elements are paramagnetic |
| B. | Coloured compounds of transition elements are paramagnetic |
| C. | Colourless compounds of transition elements are diamagnetic |
| D. | Transition elements form the complex compounds |
| Answer» B. Coloured compounds of transition elements are paramagnetic | |
| 8496. |
Emulsifier is mixed to |
| A. | Increase the stability of emulsion |
| B. | Decrease the stability of emulsion |
| C. | Change oil into water like emulsion |
| D. | None of these |
| Answer» B. Decrease the stability of emulsion | |
| 8497. |
Adsorption is multilayer in the case of [MP PET 1999] |
| A. | Physical adsorption |
| B. | Chemisorption |
| C. | Both |
| D. | None of both |
| Answer» B. Chemisorption | |
| 8498. |
Which of the following are formed on addition reaction of DCI with 3-methyl-1-butene [Roorkee 2000] |
| A. | \[C{{H}_{2}}DCHClCH{{(C{{H}_{3}})}_{2}}\] |
| B. | \[C{{H}_{2}}DC{{H}_{2}}CCl{{(C{{H}_{3}})}_{2}}\] |
| C. | \[C{{H}_{3}}CDClCH{{(C{{H}_{3}})}_{2}}\] |
| D. | \[ClC{{H}_{2}}CHDCH{{(C{{H}_{3}})}_{2}}\] |
| Answer» B. \[C{{H}_{2}}DC{{H}_{2}}CCl{{(C{{H}_{3}})}_{2}}\] | |
| 8499. |
Select the true statement about benzene from amongst the following [CBSE PMT 1992] |
| A. | Because of unsaturation benzene easily undergoes addition reactions |
| B. | There are two types of C - C bonds in benzene molecule |
| C. | There is a cyclic delocalisation of \[\pi \] electrons in benzene |
| D. | Monosubstitution of benzene group gives three isomeric substances |
| Answer» D. Monosubstitution of benzene group gives three isomeric substances | |
| 8500. |
The radius of first Bohr?s orbit for hydrogen is \[0.53\,{AA}\] . The radius of third Bohr's orbit would be [MP PMT 2001] |
| A. | \[0.79{AA}\] |
| B. | \[1.59{AA}\] |
| C. | \[3.18{AA}~~~\] |
| D. | \[4.77{AA}\] |
| Answer» E. | |