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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.
| 7651. |
Which of the following is an amphoteric oxide [BHU 2001] |
| A. | \[MgO\] |
| B. | \[A{{l}_{2}}{{O}_{3}}\] |
| C. | \[C{{l}_{2}}{{O}_{7}}\] |
| D. | \[T{{i}_{2}}{{O}_{2}}\] |
| Answer» C. \[C{{l}_{2}}{{O}_{7}}\] | |
| 7652. |
In the reversible reaction a catalyst is the substance which [CBSE PMT 1992] |
| A. | Increases the rate of the forward reaction |
| B. | Decreases the value of enthalpy change in the reaction |
| C. | Reduces the time required for reaching the equilibrium state in the reaction |
| D. | Decreases the rate of the reverse reaction |
| Answer» D. Decreases the rate of the reverse reaction | |
| 7653. |
The disintegration constant of radium with half-life 1600 years is [MHCET 2004] |
| A. | \[2.12\times {{10}^{-4}}yea{{r}^{-1}}\] |
| B. | \[4.33\times {{10}^{-4}}yea{{r}^{-1}}\] |
| C. | \[3.26\times {{10}^{-3}}yea{{r}^{-1}}\] |
| D. | \[4.33\times {{10}^{-12}}yea{{r}^{-1}}\] |
| Answer» C. \[3.26\times {{10}^{-3}}yea{{r}^{-1}}\] | |
| 7654. |
Which of the following is a chain growth polymer |
| A. | Nylon-6 |
| B. | Dacron |
| C. | Glyptal |
| D. | Polypropylene |
| Answer» E. | |
| 7655. |
The reference electrode is made by using [MP PMT 2002] |
| A. | \[ZnC{{l}_{2}}\] |
| B. | \[CuS{{O}_{4}}\] |
| C. | \[HgC{{l}_{2}}\] |
| D. | \[H{{g}_{2}}C{{l}_{2}}\] |
| Answer» E. | |
| 7656. |
In hydrolysis of a salt of weak acid and strong base, \[{{A}^{-}}+{{H}_{2}}O\] ⇄ \[HA+O{{H}^{-}},\] the hydrolysis constant \[({{K}_{h}})\] is equal to.? [Orissa JEE 2002] |
| A. | \[\frac{{{K}_{w}}}{{{K}_{a}}}\] |
| B. | \[\frac{{{K}_{w}}}{{{K}_{b}}}\] |
| C. | \[\sqrt{\frac{{{K}_{a}}}{C}}\] |
| D. | \[\frac{{{K}_{w}}}{{{K}_{a}}\times {{K}_{b}}}\] |
| Answer» B. \[\frac{{{K}_{w}}}{{{K}_{b}}}\] | |
| 7657. |
Milk can be preserved by adding a few drops of [MADT Bihar 1981] |
| A. | Formic acid solution |
| B. | Formaldehyde solution |
| C. | Acetic acid solution |
| D. | Acetaldehyde solution |
| Answer» C. Acetic acid solution | |
| 7658. |
The solubility of \[PbC{{l}_{2}}\] at \[{{25}^{o}}C\] is \[6.3\times {{10}^{-3}}\]mole/litre. Its solubility product at that temperature is [NCERT 1979; CPMT 1985] |
| A. | \[(6.3\times {{10}^{-3}})\times (6.3\times {{10}^{-3}})\] |
| B. | \[(6.3\times {{10}^{-3}})\times (12.6\times {{10}^{-3}})\] |
| C. | \[(6.3\times {{10}^{-3}})\times {{(12.6\times {{10}^{-3}})}^{2}}\] |
| D. | \[(12.6\times {{10}^{-3}})\times (12.6\times {{10}^{-3}})\] |
| Answer» D. \[(12.6\times {{10}^{-3}})\times (12.6\times {{10}^{-3}})\] | |
| 7659. |
A liquid mixture boils without changing constituent is called [DPMT 1982; CPMT 1987] |
| A. | Stable structure complex |
| B. | Binary liquid mixture |
| C. | Zeotropic liquid mixture |
| D. | Azeotropic liquid mixture |
| Answer» E. | |
| 7660. |
The Van't Hoff factor \[i\] for a 0.2 molal aqueous solution of urea is |
| A. | 0.2 |
| B. | 0.1 |
| C. | 1.2 |
| D. | 1 |
| Answer» E. | |
| 7661. |
After losing a number of \[\alpha \]and \[\beta \]-particles, \[_{92}{{U}^{238}}\] changed to \[_{82}P{{b}^{206}}\]. The total number of particles lost in this process is [MNR 1985] |
| A. | 14 |
| B. | 5 |
| C. | 8 |
| D. | 32 |
| Answer» B. 5 | |
| 7662. |
Neoprene, a synthetic rubber contains which of the following element besides C and H |
| A. | N |
| B. | O |
| C. | Cl |
| D. | F |
| Answer» D. F | |
| 7663. |
Colloidal solution of arsenious sulphide is coagulated by [MP PMT 1992] |
| A. | Addition of electrolyte |
| B. | Addition of non-electrolyte |
| C. | Addition of solid \[A{{s}_{2}}{{S}_{3}}\] |
| D. | None of these |
| Answer» B. Addition of non-electrolyte | |
| 7664. |
Addition of HCl to propene in presence of peroxides gives [BHU 1981, 98] |
| A. | 1-Chloropropane |
| B. | 2-Chloropropane |
| C. | 3-Chloropropane |
| D. | Propene dichloride |
| Answer» C. 3-Chloropropane | |
| 7665. |
When benzene is treated with excess of \[C{{l}_{2}}\] in the presence of \[{{I}_{2}}\], the end product is |
| A. | Monochlorobenzene |
| B. | Trichlorobenzene |
| C. | Hexachlorobenzene |
| D. | Benzene hexachloride |
| Answer» D. Benzene hexachloride | |
| 7666. |
Which is a naturally occuring polymer [BHU 1980] |
| A. | Polythene |
| B. | PVC |
| C. | Acetic acid |
| D. | Protein |
| Answer» E. | |
| 7667. |
The number of neutrons in the parent nucleus which gives \[{{N}^{14}}\] on b ? emission is [Pb.CET 2004] |
| A. | 7 |
| B. | 14 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 7668. |
The electronic energy levels of the hydrogen atom in the Bohr?s theory are called [AMU 2000] |
| A. | Rydberg levels |
| B. | Orbits |
| C. | Ground states |
| D. | Orbitals |
| Answer» C. Ground states | |
| 7669. |
For the functioning of enzymes which of the following statements is not correct [MP PMT 2000] |
| A. | An optimum temperature is needed |
| B. | An optimum pH is needed |
| C. | They are substrate specific |
| D. | They always increase activation energy |
| Answer» E. | |
| 7670. |
Gold number is associated with |
| A. | Only lyophobic colloids |
| B. | Only lyophilic colloids |
| C. | Both lyophobic and lyophilic colloids |
| D. | None of these |
| Answer» C. Both lyophobic and lyophilic colloids | |
| 7671. |
The term platforming is [Kerala (Med.) 2002] |
| A. | Platinum painting |
| B. | Flat sheet of platinum |
| C. | Platinum manufacturing |
| D. | Platinum used as a catalyst |
| Answer» E. | |
| 7672. |
Conjugate base of \[HSO_{4}^{-}\] is [MH CET 2004] |
| A. | \[SO_{4}^{2-}\] |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[{{H}_{3}}SO_{4}^{+}\] |
| D. | None of these |
| Answer» B. \[{{H}_{2}}S{{O}_{4}}\] | |
| 7673. |
When electric current is supplied through an ionic hydride of fused state, then [Kerala CET 2005] |
| A. | Hydrogen is obtained at anode |
| B. | Hydrogen is obtained at cathode |
| C. | No change |
| D. | Hydride ion moves towards cathode |
| E. | hydride ion present in solution |
| Answer» B. Hydrogen is obtained at cathode | |
| 7674. |
Which of the following organo-silicon compound on hydrolysis will give a three dimensional silicone [Orissa JEE 2003] |
| A. | \[{{R}_{3}}SiCl\] |
| B. | \[RSiC{{l}_{3}}\] |
| C. | \[SiC{{l}_{4}}\] |
| D. | \[{{R}_{2}}SiC{{l}_{2}}\] |
| Answer» C. \[SiC{{l}_{4}}\] | |
| 7675. |
In which of the following the inert pair effect is most prominent [MP PMT 2000] |
| A. | \[S{{O}_{2}}\] |
| B. | \[{{H}_{2}}Se\] |
| C. | \[C{{O}_{2}}\] |
| D. | \[{{H}_{2}}O\] |
| Answer» E. | |
| 7676. |
An extremely hot copper wire reacts with steam to give [CPMT 1988] |
| A. | \[CuO\] |
| B. | \[C{{u}_{2}}O\] |
| C. | \[C{{u}_{2}}{{O}_{2}}\] |
| D. | \[Cu{{O}_{2}}\] |
| Answer» C. \[C{{u}_{2}}{{O}_{2}}\] | |
| 7677. |
\[-C\equiv C-\] bond is found in [BHU 1982; MP PMT 1994] |
| A. | Ethene |
| B. | Butene |
| C. | Ethyne |
| D. | Glycerine |
| Answer» D. Glycerine | |
| 7678. |
The experimental molecular weight of an electrolyte will always be less than its calculated value because the value of Van't Hoff factor ?i? is [MP PMT 1993] |
| A. | Less than 1 |
| B. | Greater than 1 |
| C. | Equivalent to one |
| D. | Zero |
| Answer» C. Equivalent to one | |
| 7679. |
Verdigris is [BHU 1987] |
| A. | Basic copper acetate |
| B. | Basic lead acetate |
| C. | Basic lead |
| D. | None of these |
| Answer» B. Basic lead acetate | |
| 7680. |
The only alcohol that can be prepared by the indirect hydration of alkene is [AFMC 2005] |
| A. | Ethyl alcohol |
| B. | Propyl alcohol |
| C. | Isobutyl alcohol |
| D. | Methyl alcohol |
| Answer» B. Propyl alcohol | |
| 7681. |
The centric structure of benzene was proposed by [CPMT 1982, 83, 89] |
| A. | Dewar |
| B. | Ladenberg |
| C. | Kekule |
| D. | Armstrong and Baeyer |
| Answer» E. | |
| 7682. |
If the amount of radioactive substance is increased three times, the number of atoms disintegrated per unit time would [MP PMT 1994] |
| A. | Be double |
| B. | Be triple |
| C. | Remain one third |
| D. | Not change |
| Answer» C. Remain one third | |
| 7683. |
Cellulose is |
| A. | \[{{({{C}_{6}}{{H}_{10}}{{O}_{5}})}_{n}}\] |
| B. | \[{{({{C}_{3}}{{H}_{3}}{{N}_{3}})}_{n}}\] |
| C. | \[{{({{C}_{3}}{{H}_{6}}{{N}_{6}})}_{n}}\] |
| D. | \[{{({{C}_{12}}{{H}_{22}}{{O}_{11}})}_{n}}\] |
| Answer» B. \[{{({{C}_{3}}{{H}_{3}}{{N}_{3}})}_{n}}\] | |
| 7684. |
Grignard reagent is not prepared in aqueous medium but prepared; in ether medium because the reagent [KCET 2002] |
| A. | Reacts with water |
| B. | Is insoluble in water |
| C. | Is highly reactive in ether |
| D. | Becomes inactive in water |
| Answer» B. Is insoluble in water | |
| 7685. |
The equivalent weight of an element is 4. Its chloride has a V.D 59.25. Then the valency of the element is [BHU 1997] |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» C. 2 | |
| 7686. |
Order of reactivity of \[{{C}_{2}}{{H}_{6}},{{C}_{2}}{{H}_{4}}\] and \[{{C}_{2}}{{H}_{2}}\] is [MH CET 2004] |
| A. | \[{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{4}}>{{C}_{2}}{{H}_{2}}\] |
| B. | \[{{C}_{2}}{{H}_{2}}>{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{4}}\] |
| C. | \[{{C}_{2}}{{H}_{2}}>{{C}_{2}}{{H}_{4}}>{{C}_{2}}{{H}_{6}}\] |
| D. | All are equally reactive |
| Answer» D. All are equally reactive | |
| 7687. |
Suspensions are [CPMT 1984] |
| A. | Visible to naked eye |
| B. | Invisible through microscope |
| C. | Not visible by any means |
| D. | Invisible under electron microscope |
| Answer» B. Invisible through microscope | |
| 7688. |
Who modified Bohr's theory by introducing elliptical orbits for electron path [CBSE PMT 1999; AFMC 2003] |
| A. | Hund |
| B. | Thomson |
| C. | Rutherford |
| D. | Sommerfield |
| Answer» E. | |
| 7689. |
On mixing tetraethyl lead to gasoline available at petrol pumps [CPMT 1981] |
| A. | Calorific value of the fuel increases |
| B. | Odour diminishes |
| C. | Less smoke is obtained on combustion |
| D. | Antiknock property of fuel increases |
| Answer» E. | |
| 7690. |
Size of colloidal particle is [CPMT 1988; MP PMT 1991; RPET 2000] |
| A. | 1 to 10 Å |
| B. | 20 to 50 Å |
| C. | 10 to 1000 Å |
| D. | 1 to 280 Å |
| Answer» D. 1 to 280 Å | |
| 7691. |
In neutral atom, which particles are equivalent [RPMT 1997] |
| A. | \[{{p}^{+}},\,{{e}^{+}}\] |
| B. | \[{{e}^{-}},\,{{e}^{+}}\] |
| C. | \[{{e}^{-}},{{p}^{+}}\] |
| D. | \[{{p}^{+}},{{n}^{o}}\] |
| Answer» D. \[{{p}^{+}},{{n}^{o}}\] | |
| 7692. |
The viscosity of the solvent depends on [Kerala (Med.) 2002] |
| A. | Isothermic nature |
| B. | Solute - solute interaction |
| C. | Solute - solvent interaction |
| D. | Density of the liquid |
| Answer» E. | |
| 7693. |
Dialysis is the process of separation of |
| A. | Suspended particles from colloids |
| B. | Suspended particles from crystalloids |
| C. | Colloidal particles from crystalloids |
| D. | Colloidal particles from gel |
| Answer» D. Colloidal particles from gel | |
| 7694. |
The total number of sigma\[\sigma \] and pi\[(\pi )\] bonds in an ethylene molecule are |
| A. | \[4\sigma ,2\pi \] |
| B. | \[4\sigma ,1\pi \] |
| C. | \[5\sigma ,2\pi \] |
| D. | \[5\sigma ,1\pi \] |
| Answer» E. | |
| 7695. |
Bond length between carbon-carbon in ethylene molecule is [MP PET 1997] |
| A. | \[1.54\overset{\circ }{\mathop{\text{A}}}\,\] |
| B. | \[1.35\overset{\circ }{\mathop{\text{A}}}\,\] |
| C. | \[1.19\overset{\circ }{\mathop{\text{A}}}\,\] |
| D. | \[2.4\overset{\circ }{\mathop{\text{A}}}\,\] |
| Answer» C. \[1.19\overset{\circ }{\mathop{\text{A}}}\,\] | |
| 7696. |
The reaction \[C{{H}_{2}}=CH-C{{H}_{3}}+HBr\to C{{H}_{3}}CHBr-C{{H}_{3}}\] is [CBSE PMT 1996] |
| A. | Nucleophilic addition |
| B. | Electrophilic addition |
| C. | Electrophilic substitution |
| D. | Free radical addition |
| Answer» C. Electrophilic substitution | |
| 7697. |
The hardest substance amongst the following is [Kerala PMT 2004] |
| A. | \[B{{e}_{2}}C\] |
| B. | Graphite |
| C. | Titanium |
| D. | SiC |
| E. | \[{{B}_{4}}C\] |
| Answer» F. | |
| 7698. |
Hydrolysis constant for a salt of weak acid and weak base would be [RPMT 1999] |
| A. | \[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{a}}}\] |
| B. | \[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{b}}}\] |
| C. | \[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{a}}{{K}_{b}}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 7699. |
In the compound lithium tetrahydroaluminate, the ligand is [AIIMS 1997] |
| A. | \[{{H}^{+}}\] |
| B. | \[{{H}^{-}}\] |
| C. | H |
| D. | None of these |
| Answer» C. H | |
| 7700. |
Which one of the following compounds does not form an ozonide [EAMCET 1997] |
| A. | Ethene |
| B. | Propyne |
| C. | Propene |
| D. | Propane |
| Answer» E. | |