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.
| 8651. |
Froth floatation process is used for the concentration of [NCERT 1984; CPMT 1982, 87; MP PMT 1989; BHU 1997; EAMCET 1983; AMU 1984; DPMT 1989; AFMC 2000; MNR 1981; KCET 2000; MP PET 2001; Pb. PMT 2002] |
| A. | Oxide ores |
| B. | Sulphide ores |
| C. | Chloride ores |
| D. | Amalgams |
| Answer» C. Chloride ores | |
| 8652. |
For which of the processes is \[\Delta S\] negative [Pb. PMT 1998] |
| A. | \[{{H}_{2}}(g)\to 2H(g)\] |
| B. | \[{{N}_{2}}(g)\,1atm\to {{N}_{2}}(g)\,8\,atm\] |
| C. | \[2S{{O}_{3}}(g)\to 2S{{O}_{2}}(g)+{{O}_{2}}(g)\] |
| D. | \[{{C}_{(diamond)}}\to {{C}_{(graphite)}}\] |
| Answer» C. \[2S{{O}_{3}}(g)\to 2S{{O}_{2}}(g)+{{O}_{2}}(g)\] | |
| 8653. |
A solid acts as an adsorbent because it has |
| A. | A definite shape |
| B. | Small pores in it |
| C. | Unsaturated valencies |
| D. | A high lattice energy |
| Answer» D. A high lattice energy | |
| 8654. |
Which of the following compound is produced when \[C{{H}_{2}}=CH-{{(C{{H}_{2}})}_{2}}COOH\] reacts with HBr in presence of peroxides [AIIMS 2000] |
| A. | \[C{{H}_{3}}CH{{(C{{H}_{2}})}_{5}}COOH\] |
| B. | \[BrC{{H}_{2}}C{{H}_{2}}{{(C{{H}_{2}})}_{5}}COOH\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}{{(C{{H}_{2}})}_{5}}COOH\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}BrC{{H}_{2}}C{{H}_{2}}COOH\] |
| Answer» E. | |
| 8655. |
Characteristic property of Teflon is [RPET 2000] |
| A. | 2000 poise viscosity |
| B. | High surface tension |
| C. | Non-inflammable and resistant to heat |
| D. | Highly reactive |
| Answer» D. Highly reactive | |
| 8656. |
When electric current is passed through a cell having an electrolyte, the positive ions move towards the cathode and the negative ions towards the anode. If the cathode is pulled out of the solution [AIIMS 1980] |
| A. | The positive and negative ions will move towards the anode |
| B. | The positive ions will start moving towards the anode, the negative ions will stop moving |
| C. | The negative ions will continue to move towards the anode and the positive ions will stop moving |
| D. | The positive and negative ions will start moving randomly |
| Answer» E. | |
| 8657. |
Which of the following has smallest size [JIPMER (Med.) 2002] |
| A. | \[M{{g}^{2+}}\] |
| B. | \[N{{a}^{+}}\] |
| C. | \[A{{l}^{3+}}\] |
| D. | \[S{{i}^{4+}}\] |
| Answer» E. | |
| 8658. |
What product is formed when 1-chlorobutane react with alcoholic KOH [RPMT 2002] |
| A. | 1-butene |
| B. | 2-butene |
| C. | 1-butanol |
| D. | 2-butanol |
| Answer» B. 2-butene | |
| 8659. |
Which of the following plots is in accordance with the Arrhenius equation |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 8660. |
Which of the following is an example of `water in oil' type emulsion |
| A. | Butter |
| B. | Milk |
| C. | Cream |
| D. | Face cream |
| Answer» B. Milk | |
| 8661. |
The rate of dialysis depends upon |
| A. | Nature of colloidal substance |
| B. | Temperature of the solution |
| C. | Both of these |
| D. | None of these |
| Answer» C. Both of these | |
| 8662. |
Which of the following metal is obtained by leaching out process using a solution of \[NaCN\] and then precipitating the metal by addition of zinc dust [NCERT 1984; AIIMS 1983; CBSE PMT 1989] |
| A. | Copper |
| B. | Silver |
| C. | Nickel |
| D. | Iron |
| Answer» C. Nickel | |
| 8663. |
Which of the following would be expected to form ionic solution in water [CPMT 1976; Kurukshetra CEE 1998] |
| A. | \[CC{{l}_{4}}\] |
| B. | \[{{O}_{2}}\] |
| C. | \[NaBr\] |
| D. | \[CHB{{r}_{3}}\] |
| Answer» D. \[CHB{{r}_{3}}\] | |
| 8664. |
In neutralisation of KI by \[AgN{{O}_{3}}\] positive charge is due to absorption of [AMU 2000] |
| A. | \[A{{g}^{+}}\] ions |
| B. | Ag |
| C. | I ions |
| D. | Both B and C |
| Answer» B. Ag | |
| 8665. |
The conjugate acid of \[N{{H}_{3}}\] is [BHU Varanasi 1999; Pb. PMT 2004] |
| A. | \[N{{H}_{3}}\] |
| B. | \[NH_{4}^{+}\] |
| C. | \[{{N}_{2}}{{H}_{4}}\] |
| D. | \[N{{H}_{2}}OH\] |
| Answer» C. \[{{N}_{2}}{{H}_{4}}\] | |
| 8666. |
Three fused benzene rings are found in [Kerala (Engg.) 2002] |
| A. | Naphthalene |
| B. | Anthracene |
| C. | Phenanthroline |
| D. | Triphenyl methane |
| Answer» C. Phenanthroline | |
| 8667. |
In the reaction, \[2KMn{{O}_{4}}+16HCl\to 5C{{l}_{2}}+2MnC{{l}_{2}}+2KCl+8{{H}_{2}}O\] the reduction product is [Kerala (Med.) 2003] |
| A. | \[C{{l}_{2}}\] |
| B. | \[MnC{{l}_{2}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[KCl\] |
| Answer» C. \[{{H}_{2}}O\] | |
| 8668. |
Which colourless gas evolves, when \[N{{H}_{4}}Cl\] reacts with zinc in a dry cell battery [Orissa JEE 2003] |
| A. | \[N{{H}_{4}}\] |
| B. | \[{{N}_{2}}\] |
| C. | \[{{H}_{2}}\] |
| D. | \[C{{l}_{2}}\] |
| Answer» D. \[C{{l}_{2}}\] | |
| 8669. |
Which one of the following is not the characteristic of Planck's quantum theory of radiation [AIIMS 1991] |
| A. | The energy is not absorbed or emitted in whole number or multiple of quantum |
| B. | Radiation is associated with energy |
| C. | Radiation energy is not emitted or absorbed conti- nuously but in the form of small packets called quanta |
| D. | This magnitude of energy associated with a quantum is proportional to the frequency |
| Answer» B. Radiation is associated with energy | |
| 8670. |
The concentration of which ion is to be decreased, when \[N{{H}_{3}}\] solution is added [RPMT 1997] |
| A. | \[O{{H}^{-}}\] |
| B. | \[NH_{4}^{+}\] |
| C. | \[{{H}_{3}}{{O}^{+}}\] |
| D. | \[O_{2}^{-}\] |
| Answer» D. \[O_{2}^{-}\] | |
| 8671. |
Which of the following pentoses will be optically active \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HOCH \\ | \\ HCOH \\ | \\ C{{H}_{2}}OH \\ I \\ \end{matrix}\] \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HCOH \\ | \\ HOCH \\ | \\ C{{H}_{2}}OH \\ II \\ \end{matrix}\] \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HCOH \\ | \\ HCOH \\ | \\ C{{H}_{2}}OH \\ III \\ \end{matrix}\] [MP PET 1994] |
| A. | All |
| B. | II and III |
| C. | I |
| D. | II |
| Answer» B. II and III | |
| 8672. |
For two acids A and \[B,\,\,p{{K}_{a}}=1.2,\,\,p{{K}_{b}}=2.8\] respectively in value, then which is true [Bihar MEE 1998] |
| A. | A and B both are equally acidic |
| B. | A is stronger than B |
| C. | B is stronger than A |
| D. | Neither A nor B is strong |
| E. | None of these |
| Answer» C. B is stronger than A | |
| 8673. |
Solder is an alloy of [IIT 1995; MP PET 1995; AFMC 2005] |
| A. | 70% lead, 30% tin |
| B. | 30% lead, 70% tin |
| C. | 80% lead, 20% tin |
| D. | 90% Cu, 10% tin |
| Answer» C. 80% lead, 20% tin | |
| 8674. |
Colloidal solution cannot be obtained from two such substances which are |
| A. | Insoluble in each other |
| B. | In same physical state |
| C. | In different physical state |
| D. | None of these |
| Answer» E. | |
| 8675. |
100 ml of 0.1 N hypo decolourised iodine by the addition of x g of crystalline copper sulphate to excess of KI. The value of ?x? is (molecular wt. of \[CuS{{O}_{4}}.5{{H}_{2}}O\]is 250) |
| A. | 5.0 g |
| B. | 1.25 g |
| C. | 2.5 g |
| D. | 4 g |
| Answer» D. 4 g | |
| 8676. |
The cooling in refrigerator is due to [KCET 2005] |
| A. | Reaction of the refrigerator gas |
| B. | Expansion of ice |
| C. | The expansion of the gas in the refrigerator |
| D. | The work of the compressor |
| Answer» D. The work of the compressor | |
| 8677. |
In the nucleus of \[_{20}C{{a}^{40}}\] there are [CPMT 1990; EAMCET 1991] |
| A. | 40 protons and 20 electrons |
| B. | 20 protons and 40 electrons |
| C. | 20 protons and 20 neutrons |
| D. | 20 protons and 40 neutrons |
| Answer» D. 20 protons and 40 neutrons | |
| 8678. |
The standard compound for determination of configuration in the ?sugar chemistry? is |
| A. | Glycolaldehyde |
| B. | Glyceraldehyde |
| C. | Glucose |
| D. | Fructose |
| Answer» C. Glucose | |
| 8679. |
\[CuS{{O}_{4}}\] reacts with KCN solution and forms: [DPMT 2004] |
| A. | \[{{K}_{3}}[Cu{{(CN)}_{4}}]\] |
| B. | \[Cu(CN)\] |
| C. | \[Cu{{(CN)}_{2}}\] |
| D. | \[{{K}_{4}}[Cu{{(CN)}_{6}}]\] |
| Answer» B. \[Cu(CN)\] | |
| 8680. |
Osmotic pressure of 0.1 M solution of \[NaCl\] and \[N{{a}_{2}}S{{O}_{4}}\] will be [AFMC 1978] |
| A. | Same |
| B. | Osmotic pressure of \[NaCl\] solution will be more than \[N{{a}_{2}}S{{O}_{4}}\] solution |
| C. | Osmotic pressure of \[N{{a}_{2}}S{{O}_{4}}\] solution will be more than \[NaCl\] |
| D. | Osmotic pressure of \[NaS{{O}_{4}}\] will be less than that of \[NaCl\] solution |
| Answer» D. Osmotic pressure of \[NaS{{O}_{4}}\] will be less than that of \[NaCl\] solution | |
| 8681. |
Which is quick lime [EAMCET 1993] |
| A. | \[Ca{{(OH)}_{2}}\] |
| B. | \[CaO\] |
| C. | \[CaC{{O}_{3}}\] |
| D. | \[Ca{{(OH)}_{2}}+{{H}_{2}}O\] |
| Answer» C. \[CaC{{O}_{3}}\] | |
| 8682. |
Sodium lauryl sulphate is [RPET 2003] |
| A. | Cationic sol |
| B. | Anionic sol |
| C. | Neutral sol |
| D. | None of these |
| Answer» B. Anionic sol | |
| 8683. |
Lassaigne?s test is used to detect [Kerala (Engg.) 2002] |
| A. | Nitrogen and halogens |
| B. | Sodium and halogens |
| C. | Halogens and sulphur |
| D. | Nitrogen and sulphur |
| E. | All of the above |
| Answer» F. | |
| 8684. |
The IUPAC name of \[C{{H}_{2}}=CH-C{{H}_{2}}Cl\] is [MP PMT 1995] |
| A. | Allyl chloride |
| B. | 1-chloro-3-propene |
| C. | Vinyl chloride |
| D. | 3-chloro-1-propene |
| Answer» E. | |
| 8685. |
\[C{{O}_{2}}\] is isostructural with [IIT 1986; MP PMT 1986, 94, 95] |
| A. | \[SnC{{l}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[HgC{{l}_{2}}\] |
| D. | All the above |
| Answer» D. All the above | |
| 8686. |
Group displacement law states that the emission of \[\alpha \] or \[\beta \] particles results in the daughter element occupying a position, in the periodic table, either to the left or right of that of the parent element. Which one of the following alternatives gives the correct position of the daughter element |
| A. | On emission of \[\alpha \] particles -2 groups to the right On emission of \[\beta \] particles-1 group to the right |
| B. | On emission of \[\alpha \] particles -2 groups to the right On emission of \[\beta \] particles-1 group to the left |
| C. | On emission of \[\alpha \] particles - 2 groups to the left On emission of \[\beta \] particles-1 group to the left |
| D. | On emission of \[\alpha \] particles -2 groups to the left On emission of \[\beta \] particles-1 group to the right |
| Answer» E. | |
| 8687. |
A mixture of propene and methane is obtained by the cracking of |
| A. | 1-butene |
| B. | 2-butene |
| C. | n-butane |
| D. | Isobutane |
| Answer» D. Isobutane | |
| 8688. |
The number of electrons in \[{{[_{19}^{40}K]}^{-1}}\] is [CPMT 1997; AFMC 1999] |
| A. | 19 |
| B. | 20 |
| C. | 18 |
| D. | 40 |
| Answer» E. | |
| 8689. |
In the thermite process the reducing agent is [Pb. PMT 2002] |
| A. | Al |
| B. | C |
| C. | Mg |
| D. | Na |
| Answer» B. C | |
| 8690. |
A colloidal system in which gas bubbles are dispersed in a liquid is known as [MP PMT 1993] |
| A. | Foam |
| B. | Sol |
| C. | Aerosol |
| D. | Emulsion |
| Answer» B. Sol | |
| 8691. |
Which is a basic salt [MP PMT 1985] |
| A. | \[PbS\] |
| B. | \[PbC{{O}_{3}}\] |
| C. | \[PbS{{O}_{4}}\] |
| D. | \[2PbC{{O}_{3}}.Pb{{(OH)}_{2}}\] |
| Answer» E. | |
| 8692. |
Which of the following is the strongest Lewis acid [EAMCET 1998] |
| A. | \[B{{I}_{3}}\] |
| B. | \[BB{{r}_{3}}\] |
| C. | \[BC{{l}_{3}}\] |
| D. | \[B{{F}_{3}}\] |
| Answer» B. \[BB{{r}_{3}}\] | |
| 8693. |
The chemical reaction taking place at the anode of a cell is [MP PET 1996] |
| A. | Ionisation |
| B. | Reduction |
| C. | Oxidation |
| D. | Hydrolysis |
| Answer» D. Hydrolysis | |
| 8694. |
Ammonium ion is [RPMT 1999; KCET 2002] |
| A. | Neither an acid nor base |
| B. | Both an acid and a base |
| C. | A conjugate acid |
| D. | A conjugate base |
| Answer» D. A conjugate base | |
| 8695. |
Which of the following ligands is expected to bidentate [CBSE PMT 1994] |
| A. | \[Br\] |
| B. | \[{{C}_{2}}O_{4}^{2-}\] |
| C. | \[C{{H}_{3}}N{{H}_{2}}\] |
| D. | \[C{{H}_{3}}C\equiv N\] |
| Answer» E. | |
| 8696. |
The reaction of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] with \[NaCl\] and conc. \[{{H}_{2}}S{{O}_{4}}\] gives [MP PET 1994] |
| A. | \[CrC{{l}_{3}}\] |
| B. | \[CrOC{{l}_{2}}\] |
| C. | \[Cr{{O}_{2}}C{{l}_{2}}\] |
| D. | \[C{{r}_{2}}{{O}_{3}}\] |
| Answer» D. \[C{{r}_{2}}{{O}_{3}}\] | |
| 8697. |
Which of the following endothermic processes are spontaneous [CBSE PMT 2001] |
| A. | Melting of ice |
| B. | Evaporation of water |
| C. | Heat of combustion |
| D. | Both A and B |
| Answer» E. | |
| 8698. |
\[C{{H}_{2}}=C{{H}_{2}}\] is a [MP PMT 1986; CBSE PMT 1991] |
| A. | Monomer |
| B. | Polymer |
| C. | Isomer |
| D. | Equimer |
| Answer» B. Polymer | |
| 8699. |
Which metal burn in air at high temperature with the evolution of much heat [UPSEAT 1999, 2001] |
| A. | \[Cu\] |
| B. | \[Hg\] |
| C. | \[Pb\] |
| D. | \[Al\] |
| Answer» E. | |
| 8700. |
Which one of the following notations shows the product incorrectly [MP PET/PMT 1998] |
| A. | \[_{96}^{242}Cm\,(\alpha ,\,2n)\,_{97}^{243}Bk\] |
| B. | \[_{5}^{10}B\,(\alpha ,\,n)\,_{7}^{13}N\] |
| C. | \[_{7}^{14}N\,(n,\,p)\,_{6}^{14}C\] |
| D. | \[_{14}^{28}Si\,(d,\,n)\,_{15}^{29}P\] |
| Answer» B. \[_{5}^{10}B\,(\alpha ,\,n)\,_{7}^{13}N\] | |