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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.
| 8601. |
If the conductance and specific conductance of a solution is one then its cell constant would be [RPET 1999] |
| A. | 1 |
| B. | Zero |
| C. | 0.5 |
| D. | 4 |
| Answer» B. Zero | |
| 8602. |
For chemical reactions, the calculation of change in entropy is normally done |
| A. | At constant pressure |
| B. | At constant temperature |
| C. | At constant temperature and pressure both |
| D. | At constant volume |
| Answer» D. At constant volume | |
| 8603. |
What is the conjugate base of \[O{{H}^{-}}\] [AIEEE 2005] |
| A. | \[{{O}_{2}}\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[{{O}^{-}}\] |
| D. | \[{{O}^{2-}}\] |
| Answer» E. | |
| 8604. |
On increasing the temperature, the rate of the reaction increases because of [MP PMT 1997] |
| A. | Decrease in the number of collisions |
| B. | Decrease in the energy of activation |
| C. | Decrease in the number of activated molecules |
| D. | Increase in the number of effective collisions |
| Answer» E. | |
| 8605. |
Starch dispersed in hot water is an example of |
| A. | Emulsion |
| B. | Hydrophobic sol |
| C. | Lyophilic sol |
| D. | Associated colloid |
| Answer» D. Associated colloid | |
| 8606. |
\[AgCl\] is soluble in [EAMCET 1992] |
| A. | Aqua-regia |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[HCl\] |
| D. | \[N{{H}_{3}}\] (aq) |
| Answer» E. | |
| 8607. |
The azeotropic mixture of water \[(b.p{{.100}^{o}}C)\] and \[HCl\,(b.p.\,{{85}^{o}}C)\] boils at \[{{108.5}^{o}}C\]. When this mixture is distilled it is possible to obtain [IIT 1981] |
| A. | Pure \[HCl\] |
| B. | Pure water |
| C. | Pure water as well as pure \[HCl\] |
| D. | Neither \[HCl\] nor \[{{H}_{2}}O\] in their pure states |
| Answer» E. | |
| 8608. |
Which of the following transitions have minimum wavelength [DPMT 2005] |
| A. | \[{{n}_{4}}\to {{n}_{1}}\] |
| B. | \[{{n}_{2}}\to {{n}_{1}}\] |
| C. | \[{{n}_{4}}\to {{n}_{2}}\] |
| D. | \[{{n}_{3}}\to {{n}_{1}}\] |
| Answer» B. \[{{n}_{2}}\to {{n}_{1}}\] | |
| 8609. |
Which of the following is used in vulcanization of rubber [MH CET 2004] |
| A. | \[S{{F}_{6}}\] |
| B. | \[C{{F}_{4}}\] |
| C. | \[C{{l}_{2}}{{F}_{2}}\] |
| D. | \[{{C}_{2}}{{F}_{2}}\] |
| Answer» B. \[C{{F}_{4}}\] | |
| 8610. |
The standard entropies of \[C{{O}_{2}}(g),\,C(s)\] and \[{{O}_{2}}(g)\] are 213.5, 5.740 and 205 \[J{{K}^{-1}}\] respectively. The standard entropy of formation of \[C{{O}_{2}}\] is [Pb. CET 2001] |
| A. | \[2.76\,J{{K}^{-1}}\] |
| B. | \[2.12\,J{{K}^{-1}}\] |
| C. | \[1.12\,J{{K}^{-1}}\] |
| D. | \[1.40\,J{{K}^{-1}}\] |
| Answer» B. \[2.12\,J{{K}^{-1}}\] | |
| 8611. |
Animal charcoal is used in decolourising colour of liquids because it is a good [MHCET 2004] |
| A. | Adsorbate |
| B. | Adsorbent |
| C. | Oxidising agent |
| D. | Reducing agent |
| Answer» B. Adsorbent | |
| 8612. |
Which one of the following metals will not reduce \[{{H}_{2}}O\] [EAMCET 1997] |
| A. | \[Ca\] |
| B. | \[Fe\] |
| C. | \[Cu\] |
| D. | \[Li\] |
| Answer» D. \[Li\] | |
| 8613. |
In the equilibrium HClO4+H2O ⇌ H2O++\[ClO_{4}^{-}\] [BHU 1981, 86] |
| A. | \[HCl{{O}_{4}}\] is the conjugate acid of \[{{H}_{2}}O\] |
| B. | \[{{H}_{2}}O\] is the conjugate acid of \[{{H}_{3}}{{O}^{+}}\] |
| C. | \[{{H}_{3}}{{O}^{+}}\]is the conjugate base of \[{{H}_{2}}O\] |
| D. | \[ClO_{4}^{-}\] is the conjugate base of \[HCl{{O}_{4}}\] |
| Answer» E. | |
| 8614. |
The reaction rate at a given temperature becomes slower, then [MP PMT 1993; DPMT 2000] |
| A. | The free energy of activation is higher |
| B. | The free energy of activation is lower |
| C. | The entropy changes |
| D. | The initial concentration of the reactants remains constant |
| Answer» B. The free energy of activation is lower | |
| 8615. |
Moissan boron is [DCE 2003] |
| A. | Amorphous boron of ultra purity |
| B. | Crystalline boron of ultra purity |
| C. | Amorphous boron of low purity |
| D. | Crystalline boron of low purity |
| Answer» D. Crystalline boron of low purity | |
| 8616. |
Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is [AIEEE 2005] |
| A. | n-hexane |
| B. | 2, 3-dimethylbutane |
| C. | 2, 2-dimethylbutane |
| D. | 2-methylpentane |
| Answer» C. 2, 2-dimethylbutane | |
| 8617. |
Among the following, the weakest Lewis base is [NCERT 1981] |
| A. | \[{{H}^{-}}\] |
| B. | \[O{{H}^{-}}\] |
| C. | \[C{{l}^{-}}\] |
| D. | \[HCO_{3}^{-}\] |
| Answer» D. \[HCO_{3}^{-}\] | |
| 8618. |
The element used by Rutherford in his famous scattering experiment was [KCET 1998] |
| A. | Gold |
| B. | Tin |
| C. | Silver |
| D. | Lead |
| Answer» B. Tin | |
| 8619. |
Gammexane is obtained from benzene when it reacts with |
| A. | \[B{{r}_{2}}\] in bright sunlight (in the absence of a catalyst) |
| B. | \[C{{l}_{2}}\] in bright sunlight (in the absence of a catalyst) |
| C. | \[C{{H}_{3}}Cl\] in the presence of anhydrous \[AlC{{l}_{3}}\] |
| D. | \[COC{{l}_{2}}\] in the presence of anhydrous \[AlC{{l}_{3}}\] |
| Answer» C. \[C{{H}_{3}}Cl\] in the presence of anhydrous \[AlC{{l}_{3}}\] | |
| 8620. |
Solubility product of \[BaC{{l}_{2}}\] is \[4\times {{10}^{-9}}\]. Its solubility in moles/litre would be [AFMC 1982; Roorkee 1990; BHU 2000] |
| A. | \[1\times {{10}^{-3}}\] |
| B. | \[1\times {{10}^{-9}}\] |
| C. | \[4\times {{10}^{-27}}\] |
| D. | \[1\times {{10}^{-27}}\] |
| Answer» B. \[1\times {{10}^{-9}}\] | |
| 8621. |
Total number of atoms represented by the compound CuSO4.5H2O is [BHU 2005] |
| A. | 27 |
| B. | 21 |
| C. | 5 |
| D. | 8 |
| Answer» C. 5 | |
| 8622. |
While extracting an element from its ore, the ore is ground and leached with dilute \[KCN\] solution to form the soluble product potassium argentocyanide. The element is [CBSE PMT 1989] |
| A. | Lead |
| B. | Chromium |
| C. | Manganese |
| D. | Silver |
| Answer» E. | |
| 8623. |
Copper displaces which of the metal from their salt solutions [CPMT 1988] |
| A. | \[AgN{{O}_{3}}\] |
| B. | \[ZnS{{O}_{4}}\] |
| C. | \[FeS{{O}_{4}}\] |
| D. | All of these |
| Answer» B. \[ZnS{{O}_{4}}\] | |
| 8624. |
Carbohydrates are used by body mainly [DCE 1999] |
| A. | For obtaining vitamins |
| B. | As source of energy |
| C. | For all its developmental needs |
| D. | For building muscles |
| Answer» C. For all its developmental needs | |
| 8625. |
The fructose molecule in sucrose exists as |
| A. | Furanose |
| B. | Pyranose |
| C. | Open chain |
| D. | All |
| Answer» B. Pyranose | |
| 8626. |
In emulsions, the dispersion medium and dispersed phase are |
| A. | Both solids |
| B. | Both gases |
| C. | Both liquids |
| D. | One is solid and other is liquid |
| Answer» D. One is solid and other is liquid | |
| 8627. |
Boron form covalent compound due to [Pb. PMT 2000] |
| A. | Higher ionization energy |
| B. | Lower ionization energy |
| C. | Small size |
| D. | Both a and c |
| Answer» E. | |
| 8628. |
\[\underset{\text{Sucrose}}{\mathop{{{C}_{12}}{{H}_{22}}{{O}_{11}}}}\,+{{H}_{2}}O\xrightarrow{dil.\,{{H}_{2}}S{{O}_{4}}}\underset{\text{Fructose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6\,}}(aq)}}\,+\underset{\text{Glucose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}(aq)}}\,\] In this reaction, dilute \[{{H}_{2}}S{{O}_{4}}\] is called [AFMC 1997] |
| A. | Homogeneous catalysis |
| B. | Homogeneous catalyst |
| C. | Heterogeneous catalysis |
| D. | Heterogeneous catalyst |
| Answer» C. Heterogeneous catalysis | |
| 8629. |
Whipped cream is an example of [MNR 1978] |
| A. | Dispersion medium Dispersed phase Gas Liquid |
| B. | Liquid Gas |
| C. | Liquid Liquid |
| D. | Liquid Solid |
| Answer» C. Liquid Liquid | |
| 8630. |
The first use of quantum theory to explain the structure of atom was made by [IIT 1997; CPMT 2001; J&K CET 2005] |
| A. | Heisenberg |
| B. | Bohr |
| C. | Planck |
| D. | Einstein |
| Answer» C. Planck | |
| 8631. |
An isostere is [UPSEAT 1999] |
| A. | \[NO_{2}^{-}\] and \[{{O}_{3}}\] |
| B. | \[NO_{2}^{-}\] and \[PO_{4}^{3-}\] |
| C. | \[C{{O}_{2}},\,{{N}_{2}}O,\,NO_{3}^{-}\] |
| D. | \[ClO_{4}^{-}\] and \[OC{{N}^{-}}\] |
| Answer» B. \[NO_{2}^{-}\] and \[PO_{4}^{3-}\] | |
| 8632. |
A litre of solution is saturated with AgCl. To this solution if \[1.0\times {{10}^{-4}}\]mole of solid NaCl is added, what will be the \[[A{{g}^{+}}]\], assuming no volume change [UPSEAT 2004] |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | Zero |
| Answer» C. Equal | |
| 8633. |
Which metal is used to make alloy steel for armour plates, safes and helmets [KCET 2003] |
| A. | Al |
| B. | Mn |
| C. | Cr |
| D. | Pb |
| Answer» C. Cr | |
| 8634. |
Adsorption due to strong chemical forces is called [KCET (Med.) 2001] |
| A. | Chemisorption |
| B. | Physiosorption |
| C. | Reversible adsorption |
| D. | Both B and C |
| Answer» B. Physiosorption | |
| 8635. |
Which of the following is not true of a detergent molecule [JIPMER 2002] |
| A. | It has a non-polar organic part and a polar group |
| B. | It is not easily biodegraded |
| C. | It is a sodium salt of fatty acid |
| D. | It is a surface active agent |
| Answer» D. It is a surface active agent | |
| 8636. |
The solubility product of \[AgCl\] is \[4.0\times {{10}^{-10}}\] at \[298\,\,K.\] The solubility of \[AgCl\]in \[0.04\,m\,\,CaC{{l}_{2}}\] will be [KCET 1996] |
| A. | \[2.0\times {{10}^{-5}}\,m\] |
| B. | \[1.0\times {{10}^{-4}}\,m\] |
| C. | \[5.0\times {{10}^{-9}}\,m\] |
| D. | \[2.2\times {{10}^{-4}}\,m\] |
| Answer» D. \[2.2\times {{10}^{-4}}\,m\] | |
| 8637. |
Aluminium has a great affinity for oxygen and its oxidation is an exothermic process. This fact is made use of in [MP PMT 1997] |
| A. | Preparing thin foils of aluminium |
| B. | Making utensils |
| C. | Preparing duralumin alloy |
| D. | Thermite welding |
| Answer» E. | |
| 8638. |
In the preceeding question, the amount of \[N{{a}_{2}}C{{O}_{3}}\] present in the solution is [CPMT 1992] |
| A. | 2.650 g |
| B. | 1.060 g |
| C. | 0.530 g |
| D. | 0.265 g |
| Answer» D. 0.265 g | |
| 8639. |
Which of the following compounds has peroxide linkage [CPMT 1988] |
| A. | \[P{{b}_{2}}{{O}_{3}}\] |
| B. | \[Si{{O}_{2}}\] |
| C. | \[C{{O}_{2}}\] |
| D. | \[Pb{{O}_{2}}\] |
| Answer» E. | |
| 8640. |
One litre of a gas at STP weight 1.16 g it can possible be [AMU 1992] |
| A. | \[{{C}_{2}}{{H}_{2}}\] |
| B. | \[CO\] |
| C. | \[{{O}_{2}}\] |
| D. | \[C{{H}_{4}}\] |
| Answer» B. \[CO\] | |
| 8641. |
Which of the following is a conjugated acid-base pair [MADT Bihar 1984; DPMT 2001] |
| A. | \[HCl,\,\,NaOH\] |
| B. | \[N{{H}_{4}}Cl,\,\,N{{H}_{4}}OH\] |
| C. | \[{{H}_{2}}S{{O}_{4}},\,\,HS{{O}_{4}}^{-}\] |
| D. | \[KCN,\,\,HCN\] |
| Answer» D. \[KCN,\,\,HCN\] | |
| 8642. |
Acetylene can be obtained by the reaction [MH CET 2004] |
| A. | \[HCOOK\xrightarrow{\text{electrolysis}}\] |
| B. | \[CH{{I}_{3}}+6Ag+CH{{I}_{3}}\xrightarrow{\Delta }\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}OH\underset{443{}^\circ C}{\mathop{\xrightarrow{\text{Conc}\text{. }{{H}_{2}}S{{O}_{4}}}}}\,\] |
| D. | \[B{{e}_{2}}C+{{H}_{2}}O\to \] |
| Answer» C. \[C{{H}_{3}}C{{H}_{2}}OH\underset{443{}^\circ C}{\mathop{\xrightarrow{\text{Conc}\text{. }{{H}_{2}}S{{O}_{4}}}}}\,\] | |
| 8643. |
\[12g\] of \[Mg\](at. mass 24) will react completely with acid to give [MNR 1985] |
| A. | One mole of \[{{H}_{2}}\] |
| B. | 1/2 mole of \[{{H}_{2}}\] |
| C. | 2/3 mole of \[{{O}_{2}}\] |
| D. | Both 1/2 mol of \[{{H}_{2}}\] and 1/2 mol of \[{{O}_{2}}\] |
| Answer» C. 2/3 mole of \[{{O}_{2}}\] | |
| 8644. |
Which one is an unsaturated compound [BIT 1990] |
| A. | \[{{C}_{6}}{{H}_{14}}\] |
| B. | \[{{C}_{4}}{{H}_{8}}\] |
| C. | \[{{C}_{3}}{{H}_{7}}OH\] |
| D. | \[C{{H}_{3}}OH\] |
| Answer» C. \[{{C}_{3}}{{H}_{7}}OH\] | |
| 8645. |
Which is most basic in character [UPSEAT 2004] |
| A. | \[CsOH\] |
| B. | KOH |
| C. | NaOH |
| D. | LiOH |
| Answer» B. KOH | |
| 8646. |
When calomel reacts with \[N{{H}_{4}}OH,\] we get [CBSE PMT 1996] |
| A. | \[HgN{{H}_{2}}Cl\] |
| B. | \[N{{H}_{2}}-Hg-Hg-Cl\] |
| C. | \[H{{g}_{2}}O\] |
| D. | \[HgO\] |
| Answer» B. \[N{{H}_{2}}-Hg-Hg-Cl\] | |
| 8647. |
Which of the following is only acidic in nature [AIIMS 2004] |
| A. | \[Be{{(OH)}_{2}}\] |
| B. | \[Mg{{(OH)}_{2}}\] |
| C. | \[B{{(OH)}_{3}}\] |
| D. | \[Al{{(OH)}_{3}}\] |
| Answer» D. \[Al{{(OH)}_{3}}\] | |
| 8648. |
Platinised asbestos helps in the formation of \[S{{O}_{3}}\] form \[S{{O}_{2}}\] and \[{{O}_{2}}\]. But, if even a small amount of \[A{{s}_{2}}{{O}_{3}}\] is present the platinised asbestos does not help in the formation of \[S{{O}_{3}}\]. \[A{{s}_{2}}{{O}_{3}}\] acts here as [MP PMT 1997] |
| A. | A positive catalyst |
| B. | A negative catalyst |
| C. | An auto catalyst |
| D. | A poison |
| Answer» E. | |
| 8649. |
The molar conductivity is maximum for the solution of concentration [DCE 2002] |
| A. | 0.001 M |
| B. | 0.005 M |
| C. | 0.002 M |
| D. | 0.004 M |
| Answer» B. 0.005 M | |
| 8650. |
The monomer of the polymer [MH CET 2004; CBSE PMT 2005] |
| A. | |
| B. | \[{{(C{{H}_{3}})}_{2}}C=C{{(C{{H}_{3}})}_{2}}\] |
| C. | \[C{{H}_{3}}CH=CHC{{H}_{3}}\] |
| D. | \[C{{H}_{3}}CH=C{{H}_{2}}\] |
| Answer» B. \[{{(C{{H}_{3}})}_{2}}C=C{{(C{{H}_{3}})}_{2}}\] | |