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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.
| 9151. |
Which element is the end product of each natural radioactive series [MP PMT 1996; MP PET/PMT 1998] |
| A. | \[Sn\] |
| B. | \[Bi\] |
| C. | \[Pb\] |
| D. | \[C\] |
| Answer» D. \[C\] | |
| 9152. |
Crystalline metal can be transformed into metallic glass by [NCERT 1984] |
| A. | Alloying |
| B. | Pressing into thin plates |
| C. | Slow cooling of molten metal |
| D. | Very rapid cooling of a spray of the molten metal |
| Answer» E. | |
| 9153. |
For making \[Ag\] from \[AgN{{O}_{3}}\], which of the following is used [AFMC 1998] |
| A. | \[P{{H}_{3}}\] |
| B. | \[As{{H}_{3}}\] |
| C. | \[N{{a}_{2}}C{{O}_{3}}\] |
| D. | \[N{{H}_{3}}\] |
| Answer» B. \[As{{H}_{3}}\] | |
| 9154. |
The example of heteropolar sol is |
| A. | Starch sol in water |
| B. | Rubber sol in water |
| C. | Protein sol in water |
| D. | Sulphur sol |
| Answer» D. Sulphur sol | |
| 9155. |
When \[CO\] is passed over solid \[NaOH\] heated to \[{{200}^{o}}C\], it forms [MP PMT 1985] |
| A. | \[N{{a}_{2}}C{{O}_{3}}\] |
| B. | \[NaHC{{O}_{3}}\] |
| C. | \[HCOONa\] |
| D. | None |
| Answer» D. None | |
| 9156. |
\[NaOH\] is manufactured by electrolysis of brine solution. The products of the reaction are [KCET 1990] |
| A. | \[C{{l}_{2}}\] and \[{{H}_{2}}\] |
| B. | \[C{{l}_{2}}\] and \[Na-Hg\] |
| C. | \[C{{l}_{2}}\] and \[Na\] |
| D. | \[C{{l}_{2}}\] and \[{{O}_{2}}\] |
| Answer» B. \[C{{l}_{2}}\] and \[Na-Hg\] | |
| 9157. |
The most important oxidation state of copper is [MP PMT 1987] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 9158. |
What name is given to the reaction between hydrogen ion and hydroxyl ion [MP PMT 1990] |
| A. | Hydrogenation |
| B. | Hydroxylation |
| C. | Hydrolysis |
| D. | Neutralization |
| Answer» E. | |
| 9159. |
Which of the following statement is true [MP PMT 1996] |
| A. | The conjugate base of a strong acid is a strong base |
| B. | The conjugate base of a weak acid is a strong base |
| C. | The conjugate base of a weak acid is a weak base |
| D. | The base and its conjugate acid react to form a neutral solution |
| Answer» C. The conjugate base of a weak acid is a weak base | |
| 9160. |
Milk is [MP PMT 1995;CPMT 1988; MP PET 1991; MNR 1982] |
| A. | Dispersed fats in oil |
| B. | Dispersed fats in water |
| C. | Dispersed water in fats |
| D. | Dispersed water in oil |
| Answer» C. Dispersed water in fats | |
| 9161. |
A metal surface is exposed to solar radiations [DPMT 2005] |
| A. | The emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations |
| B. | The emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiation |
| C. | The emitted electrons have zero energy |
| D. | The emitted electrons have energy equal to energy of photos of incident light |
| Answer» B. The emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiation | |
| 9162. |
The precipitate of \[Ca{{F}_{2}}\]\[({{K}_{sp}}=1.7\times {{10}^{-10}})\] is obtained when equal volumes of the following are mixed [IIT 1992; UPSEAT 2000] |
| A. | \[{{10}^{-4}}M\,C{{a}^{2+}}+{{10}^{-4}}M\,{{F}^{-}}\] |
| B. | \[{{10}^{-2}}M\,C{{a}^{2+}}+{{10}^{-3}}M\,{{F}^{-}}\] |
| C. | Both |
| D. | None of these |
| Answer» C. Both | |
| 9163. |
The reaction \[C{{H}_{4}}+C{{l}_{2}}\underset{{}}{\mathop{\xrightarrow{\text{uv light}}}}\,C{{H}_{3}}Cl+HCl\] is an example of [CBSE PMT 1999, 2002] |
| A. | Addition reactions |
| B. | Substitution reaction |
| C. | Elimination reaction |
| D. | Rearrangement reaction |
| Answer» C. Elimination reaction | |
| 9164. |
The molecular weight of a gas is 45. Its density at STP is [Pb. PMT 2004] |
| A. | 22.4 |
| B. | 11.2 |
| C. | 5.7 |
| D. | 2.0 |
| Answer» E. | |
| 9165. |
A solution containing \[N{{a}_{2}}C{{O}_{3}}\] and NaOH requires 300 ml of 0.1 N HCl using phenolpthalein as an indicator. Methyl orange is then added to the above titrated solution when a further 25 ml of 0.2 N HCl is required. The amount of NaOH present in solution is \[(NaOH=40,\,N{{a}_{2}}C{{O}_{3}}=106)\] [CPMT 1992] |
| A. | 0.6 g |
| B. | 1.0 g |
| C. | 1.5 g |
| D. | 2.0 g |
| Answer» C. 1.5 g | |
| 9166. |
When a radioactive nucleus emits an \[\alpha \]-particle, the mass of the atom [NCERT 1973, 82] |
| A. | Increases and its at. number decreases |
| B. | Decreases and its at. number decreases |
| C. | Decreases and its at. number increases |
| D. | Remains same and its at. number decreases |
| Answer» C. Decreases and its at. number increases | |
| 9167. |
In the reaction \[Cu(s)+2A{{g}^{+}}(aq)\to C{{u}^{2+}}(aq)+2Ag(s)\] The reduction half-cell reaction is [AIIMS 1997] |
| A. | \[Cu+2{{e}^{-}}\to C{{u}^{2-}}\] |
| B. | \[Cu-2{{e}^{-}}\to C{{u}^{2+}}\] |
| C. | \[A{{g}^{+}}+{{e}^{-}}\to Ag\] |
| D. | \[Ag-{{e}^{-}}\to A{{g}^{+}}\] |
| Answer» D. \[Ag-{{e}^{-}}\to A{{g}^{+}}\] | |
| 9168. |
By which law, energy produced in nuclear reaction is given [MP PET 2000] |
| A. | Graham?s law |
| B. | Charle?s law |
| C. | Gas Lussac?s Law |
| D. | Einstein?s law |
| Answer» E. | |
| 9169. |
A compound of carbon hydrogen and nitrogen contains three elements in the respective ratio of 9 : 1 : 35 grams. The Empirical formula for the compound is [DCE 2001] |
| A. | \[{{C}_{2}}{{H}_{4}}N\] |
| B. | \[{{C}_{3}}{{H}_{4}}N\] |
| C. | \[{{C}_{3}}{{H}_{6}}N\] |
| D. | \[{{C}_{2}}{{H}_{6}}N\] |
| Answer» C. \[{{C}_{3}}{{H}_{6}}N\] | |
| 9170. |
The percentage of \[{{N}_{2}}\] in urea is about [KCET (Med.) 2001] |
| A. | 18.05 |
| B. | 28.29 |
| C. | 46.66 |
| D. | 85.56 |
| Answer» D. 85.56 | |
| 9171. |
The colloidal solution of mercury in water can be easily obtained by |
| A. | Mechanical precipitation |
| B. | Bredig's arc method |
| C. | Repeated washing |
| D. | Ultrasonic dispersion |
| Answer» E. | |
| 9172. |
In a reversible reaction, a catalyst will affect the rate of [KCET (Med.) 2002] |
| A. | Forward reaction |
| B. | Reverse reaction |
| C. | Forward and reverse reaction |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 9173. |
The fuel of atomic pile is [NCERT 1973; AFMC 1989] |
| A. | Thorium |
| B. | Sodium |
| C. | Uranium |
| D. | Petroleum |
| Answer» D. Petroleum | |
| 9174. |
Lyophilic sols are more stable than lyophobic sols because [NCERT 1982, 83] |
| A. | The colloidal particles have positive charge |
| B. | The colloidal particles have no charge |
| C. | The colloidal particles are solvated |
| D. | There are strong electrostatic repulsions between the negatively charged colloidal particles |
| Answer» D. There are strong electrostatic repulsions between the negatively charged colloidal particles | |
| 9175. |
In the electrolysis of alumina, cryolite is added to [IIT 1986; BHU 1987] |
| A. | Increase the melting point of alumina |
| B. | Increase the electrical conductivity |
| C. | Minimise the anodic effect |
| D. | Remove impurities from alumina |
| Answer» C. Minimise the anodic effect | |
| 9176. |
An organic compound on analysis gave C = 48 gm, H = 8 gm and N = 56 gm. Volume of 1.0 g of the compound was found to be 200 ml at NTP. Molecular formula of the compound is [MP PET 1986] |
| A. | \[{{C}_{4}}{{H}_{8}}{{N}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{4}}{{N}_{2}}\] |
| C. | \[{{C}_{12}}{{H}_{24}}{{N}_{12}}\] |
| D. | \[{{C}_{16}}{{H}_{32}}{{N}_{16}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{4}}{{N}_{2}}\] | |
| 9177. |
Steel differs from pig iron and wrought iron in that it contains [KCET 1991] |
| A. | No carbon at all |
| B. | Less carbon than either |
| C. | More carbon than either |
| D. | An amount of carbon intermediate between two |
| Answer» E. | |
| 9178. |
Which has a coordinate bond [RPMT 1997] |
| A. | \[SO_{3}^{2-}\] |
| B. | \[C{{H}_{4}}\] |
| C. | \[C{{O}_{2}}\] |
| D. | \[N{{H}_{3}}\] |
| Answer» B. \[C{{H}_{4}}\] | |
| 9179. |
Terylene is a [AFMC 1989; MP PET 1994; RPET 1999; Kerala (med.) 2002; MP PMT 2004] |
| A. | Polyamide |
| B. | Polyester |
| C. | Polyethylene |
| D. | Polypropylene |
| Answer» C. Polyethylene | |
| 9180. |
Which of the following is not used as a Lewis acid [MP PET 2000] |
| A. | \[SnC{{l}_{4}}\] |
| B. | \[FeC{{l}_{3}}\] |
| C. | \[KCl\] |
| D. | \[B{{F}_{3}}\] |
| Answer» D. \[B{{F}_{3}}\] | |
| 9181. |
Which one of the following salts gives an acidic solution in water [MP PET 2002] |
| A. | \[C{{H}_{3}}COONa\] |
| B. | \[N{{H}_{4}}Cl\] |
| C. | \[NaCl\] |
| D. | \[C{{H}_{3}}COON{{H}_{4}}\] |
| Answer» C. \[NaCl\] | |
| 9182. |
The unit \[oh{{m}^{-1}}\] is used for [J & K 2005] |
| A. | Molar conductivity |
| B. | Equivalent conductivity |
| C. | Specific conductivity |
| D. | Conductivity |
| Answer» E. | |
| 9183. |
The ratio of \[\sigma \] and \[\pi \] bonds in benzene is [CPMT 1991; BHU 1995] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 9184. |
Sodium metal is extracted by [MP PMT 1996] |
| A. | Electrolysis of aqueous solution of sodium chloride |
| B. | Electrolysis of fused sodium chloride |
| C. | Heating sodium oxide with carbon |
| D. | Heating sodium oxide with hydrogen |
| Answer» C. Heating sodium oxide with carbon | |
| 9185. |
The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom [IIT Screening 2004] |
| A. | \[H{{e}^{+}}(n=2)\] |
| B. | \[L{{i}^{2+}}(n=2)\] |
| C. | \[L{{i}^{2+}}(n=3)\] |
| D. | \[B{{e}^{3+}}(n=2)\] |
| Answer» E. | |
| 9186. |
The addition of tetraethyl lead to petrol [MP PET 1993] |
| A. | Lowers its octane number |
| B. | Raises its octane number |
| C. | May raise or lower the octane number |
| D. | Has no effect on octane number |
| Answer» C. May raise or lower the octane number | |
| 9187. |
Which of the following is used in photography [CPMT 1980] |
| A. | \[AgCl\] |
| B. | \[AgBr\] |
| C. | \[AgI\] |
| D. | \[A{{g}_{2}}O\] |
| Answer» C. \[AgI\] | |
| 9188. |
The systematic name of \[C{{H}_{3}}-CHBr-C{{H}_{2}}OH\] is [BHU 1982] |
| A. | 3-hydroxy-2-bromopropane |
| B. | 2-bromopropanol-1 |
| C. | 2-bromo-3-propanol |
| D. | 3-hydroxy isopropyl bromide |
| Answer» C. 2-bromo-3-propanol | |
| 9189. |
1.12 ml of a gas is produced at STP by the action of 4.12 mg of alcohol, with methyl magnesium iodide. The molecular mass of alcohol is [Roorkee 1992; IIT 1993] |
| A. | 16.0 |
| B. | 41.2 |
| C. | 82.4 |
| D. | 156.0 |
| Answer» D. 156.0 | |
| 9190. |
Propylene on hydrolysis with sulphuric acid forms [MH CET-2003] |
| A. | n-propyl alcohol |
| B. | Isopropyl alcohol |
| C. | Ethyl alcohol |
| D. | Butyl alcohol |
| Answer» C. Ethyl alcohol | |
| 9191. |
An example of a double salt is [MP PET 2001] |
| A. | Bleaching powder |
| B. | Hypo |
| C. | \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] |
| D. | Potash alum |
| Answer» E. | |
| 9192. |
Invar, an alloy of Fe and Ni is used in watches and meter scale, its characteristic property is [Kerala (Engg.) 2002] |
| A. | Small coefficient of expansion |
| B. | Resistance to corrosion |
| C. | Hardness and elasticity |
| D. | Magnetic nature |
| Answer» B. Resistance to corrosion | |
| 9193. |
Which of the following form dimeric halides [Roorkee Qualifying 1998] |
| A. | \[Al\] |
| B. | \[Mg\] |
| C. | \[In\] |
| D. | \[Ga\] |
| Answer» B. \[Mg\] | |
| 9194. |
A large increase in the rate of a reaction for a rise in temperature is due to [EAMCET 1980; MP PET 1995] |
| A. | The decrease in the number of collisions |
| B. | The increase in the number of activated molecules |
| C. | The shortening of the mean free path |
| D. | The lowering of the activation energy |
| Answer» C. The shortening of the mean free path | |
| 9195. |
The compound ?A? having formula \[{{C}_{8}}{{H}_{10}}\] (aromatic) which gives 1 mononitro substitute and 3 nitrosubstitute compound is [DPMT 2002] |
| A. | m-Xylene |
| B. | p-Xylene |
| C. | o-Xylene |
| D. | Ethyl benzene |
| Answer» C. o-Xylene | |
| 9196. |
Which of the following shows dimerisation [DCE 2002] |
| A. | \[HgC{{l}_{2}}\] |
| B. | \[{{B}_{2}}{{H}_{6}}\] |
| C. | \[TiC{{l}_{4}}\] |
| D. | \[S{{O}_{2}}\] |
| Answer» B. \[{{B}_{2}}{{H}_{6}}\] | |
| 9197. |
Alcoholic solution of KOH is used for [CPMT 1982, 86; IIT-JEE 1990] |
| A. | Dehydration |
| B. | Dehydrogenation |
| C. | Dehydrohalogenation |
| D. | Dehalogenation |
| Answer» D. Dehalogenation | |
| 9198. |
Which one of the following contain isopropyl group [BHU 2005] |
| A. | 2,2,3,3-tetramethylpentane |
| B. | 2-methylpentane |
| C. | 2,2,3-trimethylpentane |
| D. | 3,3-dimethylpentane |
| Answer» C. 2,2,3-trimethylpentane | |
| 9199. |
An aerosol is a [UPSEAT 2004] |
| A. | Dispersion of a solid or liquid in a gas |
| B. | Dispersion of a solid in a liquid |
| C. | Dispersion of a liquid in a liquid |
| D. | Solid solution |
| Answer» B. Dispersion of a solid in a liquid | |
| 9200. |
Acetylene can be prepared from [CPMT 1988] |
| A. | Potassium fumarate |
| B. | Calcium carbide |
| C. | Ethylene bromide |
| D. | All of these |
| Answer» E. | |