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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.
| 8151. |
Dissociation of \[{{H}_{3}}P{{O}_{4}}\]takes place in following steps [CPMT 1976; NCERT 1987] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 8152. |
Thermoplastics are |
| A. | Linear polymers |
| B. | Highly cross-linked |
| C. | Both A and B |
| D. | Crystalline |
| Answer» B. Highly cross-linked | |
| 8153. |
The proper rays for radiocarbon dating are [MP PET 2002] |
| A. | UV-rays |
| B. | IR-rays |
| C. | Cosmic rays |
| D. | X-rays |
| Answer» D. X-rays | |
| 8154. |
Which of the following compounds corresponds Van't Hoff factor \['i'\] to be equal to 2 for dilute solution [NCERT 1978] |
| A. | \[{{K}_{2}}S{{O}_{4}}\] |
| B. | \[NaHS{{O}_{4}}\] |
| C. | Sugar |
| D. | \[MgS{{O}_{4}}\] |
| Answer» E. | |
| 8155. |
Ziegler-Natta catalyst is an organometallic compound of which metal [J & K CET 2005] |
| A. | Iron |
| B. | Zirconium |
| C. | Rhodium |
| D. | Titanium |
| Answer» E. | |
| 8156. |
Addition of catalyst in a system [MP PMT 1992] |
| A. | Increases equilibrium concentrations |
| B. | No effect on equilibrium concentrations |
| C. | Decreases equilibrium concentrations |
| D. | Increases rate of forward reaction and decreases rate of backward reaction |
| Answer» C. Decreases equilibrium concentrations | |
| 8157. |
The spin magnetic moment of cobalt in the compound \[Hg[Co{{(SCN)}_{4}}]\] is [IIT JEE Screening 2004] |
| A. | \[\sqrt{3}\] |
| B. | \[\sqrt{8}\] |
| C. | \[\sqrt{15}\] |
| D. | \[\sqrt{24}\] |
| Answer» D. \[\sqrt{24}\] | |
| 8158. |
The polymer used for making contact lenses for eyes is [AMU 1999] |
| A. | Polymethylmethacrylate |
| B. | Polyethelene |
| C. | Polyethylacrylate |
| D. | Nylon-6 |
| Answer» B. Polyethelene | |
| 8159. |
\[\underset{CH}{\mathop{\overset{CH}{\mathop{|||}}\,}}\,\]reacts with acetic acid in presence of Hg2+ to give [BHU 2005] |
| A. | \[\underset{CH{{(C{{H}_{3}}COO)}_{2}}}{\mathop{\overset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}}\,\] |
| B. | \[\underset{CH{{(C{{H}_{3}}COO)}_{2}}}{\mathop{\overset{CH{{(C{{H}_{3}}COO)}_{2}}}{\mathop{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}}\,\] |
| C. | \[\underset{C{{H}_{2}}(C{{H}_{3}}COO)}{\mathop{\overset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}}\,\] |
| D. | None of these |
| Answer» B. \[\underset{CH{{(C{{H}_{3}}COO)}_{2}}}{\mathop{\overset{CH{{(C{{H}_{3}}COO)}_{2}}}{\mathop{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}}\,\] | |
| 8160. |
A monodentate ligand has |
| A. | One co-ordinate site |
| B. | Two co-ordinate sites |
| C. | Any number of co-ordinate sites |
| D. | No capacity to co-ordinate |
| Answer» B. Two co-ordinate sites | |
| 8161. |
The spontaneous flow of heat is always |
| A. | From low to high pressure |
| B. | From high to high pressure |
| C. | Unidirectional from lower temperature to higher temperature |
| D. | Unidirectional from the higher to lower temperature |
| Answer» E. | |
| 8162. |
Which doesn?t follow Markownikoff?s rule [JEE Orissa 2004; MP PMT 2004; BCECE 2005] |
| A. | \[C{{H}_{3}}-CH=C{{H}_{2}}\] |
| B. | \[C{{H}_{3}}CH=CHC{{H}_{3}}\] |
| C. | \[C{{H}_{3}}-\underset{C{{H}_{3}}\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,CH=C{{H}_{2}}\] |
| D. | \[C{{H}_{3}}-C{{H}_{2}}-CH=C{{H}_{2}}\] |
| Answer» C. \[C{{H}_{3}}-\underset{C{{H}_{3}}\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,CH=C{{H}_{2}}\] | |
| 8163. |
One of the important use of ferrous sulphate is in the |
| A. | Manufacture of blue black ink |
| B. | Manufacture of chalks |
| C. | Preparation of hydrogen sulphide |
| D. | Preparation of anhydrous ferric chloride |
| Answer» B. Manufacture of chalks | |
| 8164. |
On adding few drops of dilute \[HCl\] or \[FeC{{l}_{3}}\] to freshly precipitated ferric hydroxide a red coloured colloidal solution is obtained. The phenomenon is known as [NCERT 1981; AFMC 1982; MP PMT 1989, 97] |
| A. | Peptisation |
| B. | Dialysis |
| C. | Protective action |
| D. | Dissolution |
| Answer» B. Dialysis | |
| 8165. |
The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is [CPMT 1997; Pb. PMT 1999; MP PMT 1999] |
| A. | 17 |
| B. | 37 |
| C. | 2 |
| D. | 38 |
| Answer» E. | |
| 8166. |
In a complex, the highest possible coordination number is |
| A. | 6 |
| B. | 12 |
| C. | 4 |
| D. | 8 |
| Answer» E. | |
| 8167. |
Which one of the following is most soluble [CBSE PMT 1994; RPMT 2000] |
| A. | \[CuS\,({{K}_{sp}}=8\times {{10}^{-37}})\] |
| B. | \[MnS\,({{K}_{sp}}=7\times {{10}^{-16}})\] |
| C. | \[B{{i}_{2}}{{S}_{3}}\,({{K}_{sp}}=1\times {{10}^{-70}})\] |
| D. | \[A{{g}_{2}}S\,({{K}_{sp}}=6\times {{10}^{-51}})\] |
| Answer» C. \[B{{i}_{2}}{{S}_{3}}\,({{K}_{sp}}=1\times {{10}^{-70}})\] | |
| 8168. |
The entropy of crystalline substances at absolute zero going by the third law of thermodynamics should be taken as [J & K 2005] |
| A. | 100 |
| B. | 50 |
| C. | Zero |
| D. | Different for different substances |
| Answer» D. Different for different substances | |
| 8169. |
Electron occupies the available orbital singly before pairing in any one orbital occurs, it is [CBSE PMT 1991] |
| A. | Pauli's exclusion principle |
| B. | Hund's Rule |
| C. | Heisenberg's principle |
| D. | Prout's hypothesis |
| Answer» C. Heisenberg's principle | |
| 8170. |
Internal energy of an ideal gas depends on |
| A. | Volume |
| B. | Temperature |
| C. | Pressure |
| D. | None of these |
| Answer» C. Pressure | |
| 8171. |
Which equation represents an example of Friedel-Craft?s reaction [MNR 1993; CPMT 1996] |
| A. | \[{{C}_{6}}{{H}_{6}}+{{C}_{2}}{{H}_{5}}Cl\xrightarrow{AlC{{l}_{3}}}{{C}_{6}}{{H}_{5}}{{C}_{2}}{{H}_{5}}+HCl\] |
| B. | \[{{C}_{2}}{{H}_{5}}OH+HCl\xrightarrow{ZnC{{l}_{2}}}{{C}_{2}}{{H}_{5}}Cl+{{H}_{2}}O\] |
| C. | \[{{C}_{6}}{{H}_{5}}Cl+C{{H}_{3}}COCl\xrightarrow{AlC{{l}_{3}}}{{C}_{6}}{{H}_{5}}COC{{H}_{3}}+C{{l}_{2}}\] |
| D. | \[{{C}_{2}}{{H}_{5}}Br+Mg\xrightarrow{Ether}{{C}_{2}}{{H}_{5}}Mgr\] |
| Answer» B. \[{{C}_{2}}{{H}_{5}}OH+HCl\xrightarrow{ZnC{{l}_{2}}}{{C}_{2}}{{H}_{5}}Cl+{{H}_{2}}O\] | |
| 8172. |
Acidified potassium dichromate on reacting with a sulphite is reduced to |
| A. | \[Cr{{O}_{2}}C{{l}_{2}}\] |
| B. | \[CrO_{4}^{2-}\] |
| C. | \[C{{r}^{3+}}\] |
| D. | \[C{{r}^{2+}}\] |
| Answer» D. \[C{{r}^{2+}}\] | |
| 8173. |
\[C{{H}_{2}}=C{{H}_{2}}\underset{KOH/{{H}_{2}}O}{\mathop{\xrightarrow{KMn{{O}_{4}}}}}\,X\]. Product 'X' in above reaction is [RPMT 2003] |
| A. | Ethylene glycol |
| B. | Glucose |
| C. | Ethanol |
| D. | All of these |
| Answer» B. Glucose | |
| 8174. |
Which of the following oxides is white but becomes yellow on heating [MP PET 1995] |
| A. | \[AgO\] |
| B. | \[A{{g}_{2}}O\] |
| C. | \[FeO\] |
| D. | \[ZnO\] |
| Answer» E. | |
| 8175. |
Chemically 'digestion' is [NCERT 1978] |
| A. | Hydrolysis |
| B. | Change in bacteria |
| C. | Hydrogenation |
| D. | Dehydrogenation |
| Answer» B. Change in bacteria | |
| 8176. |
Which of the following reactions occurs at the cathode during the charging of a lead storage battery [Manipal MEE 1995; MP PET 2002] |
| A. | \[P{{b}^{2+}}+2{{e}^{-}}\to Pb\] |
| B. | \[P{{b}^{2+}}+SO_{4}^{2-}\to PbS{{O}_{4}}\] |
| C. | \[Pb\to P{{b}^{2+}}+2{{e}^{-}}\] |
| D. | \[PbS{{O}_{4}}+2{{H}_{2}}O\to 2Pb{{O}_{2}}+4SO_{4}^{2-}+2{{e}^{-}}\] |
| Answer» E. | |
| 8177. |
A metallic carbide on treatment with water gives a colourless gas which burns readily in air and which gives a precipitate with ammoniacal silver nitrate solution. Gas evolved is [NCERT 1975; CPMT 1977; MP PET 2002] |
| A. | Methane |
| B. | Ethane |
| C. | Acetylene |
| D. | Ethylene |
| Answer» D. Ethylene | |
| 8178. |
Number of protons, neutrons and electrons in the element \[_{89}^{231}Y\] is [AFMC 1997] |
| A. | 89, 231, 89 |
| B. | 89, 89, 242 |
| C. | 89, 142, 89 |
| D. | 89, 71, 89 |
| Answer» D. 89, 71, 89 | |
| 8179. |
The safest and the most common alternative of sugar is [MP PMT 2003] |
| A. | Glucose |
| B. | Aspartame |
| C. | Saccharin |
| D. | Cyclodextrin |
| Answer» D. Cyclodextrin | |
| 8180. |
Benzene can react with [UPSEAT 2003] |
| A. | \[B{{r}_{2}}\] water |
| B. | \[HN{{O}_{3}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[C{{H}_{3}}OH\] |
| Answer» C. \[{{H}_{2}}O\] | |
| 8181. |
Fog is an example of colloidal system [MNR 1985; NCERT 1985; CPMT 1988; MP PMT 1991; MP PET 1996; UPSEAT 1999, 2000] |
| A. | Liquid dispersed in gas |
| B. | Gas dispersed in gas |
| C. | Solid dispersed in gas |
| D. | Gas dispersed in liquid |
| Answer» B. Gas dispersed in gas | |
| 8182. |
Which one of the following statement is not correct |
| A. | The extent of adsorption depends on the nature of the adsorbent and adsorbate |
| B. | The extent of adsorption depends on the pressure of the gas |
| C. | The extent of adsorption depends on the temperature |
| D. | The extent of adsorption has no upper limit |
| Answer» E. | |
| 8183. |
Which of the following polymer is an example of fibre [AIIMS 2000; Pb. CET 2001] |
| A. | Silk |
| B. | Dacron |
| C. | Nylon-66 |
| D. | All of these |
| Answer» E. | |
| 8184. |
An aqueous solution of aluminium sulphate would show [NCERT 1977] |
| A. | An acidic reaction |
| B. | A neutral reaction |
| C. | A basic reaction |
| D. | Both acidic and basic reaction |
| Answer» B. A neutral reaction | |
| 8185. |
Which of the following molecules is most suitable to disperse benzene in water [AIIMS 2005] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 8186. |
Conductivity of a strong electrolyte [KCET 1993] |
| A. | Increases on dilution |
| B. | Does not change considerably on dilution |
| C. | Decreases on dilution |
| D. | Depends on density |
| Answer» C. Decreases on dilution | |
| 8187. |
When \[N{{H}_{4}}Cl\] is added to \[N{{H}_{4}}OH\] solution, the dissociation of ammonium hydroxide is reduced. It is due to [MP PMT 1993] |
| A. | Common ion effect |
| B. | Hydrolysis |
| C. | Oxidation |
| D. | Reduction |
| Answer» B. Hydrolysis | |
| 8188. |
\[MnO_{4}^{-}\] on reduction in acidic medium forms [MP PMT 1995] |
| A. | \[Mn{{O}_{2}}\] |
| B. | \[M{{n}^{++}}\] |
| C. | \[MnO_{4}^{--}\] |
| D. | \[Mn\] |
| Answer» C. \[MnO_{4}^{--}\] | |
| 8189. |
A reagent used to test for unsaturation of allkene is [BHU 2004] |
| A. | conc. \[{{H}_{2}}S{{O}_{4}}\] |
| B. | Ammonical \[C{{u}_{2}}C{{l}_{2}}\] |
| C. | Ammonical \[AgN{{O}_{3}}\] |
| D. | Solution of \[B{{r}_{2}}\]in \[CC{{l}_{4}}\] |
| Answer» E. | |
| 8190. |
The intermediate compound formed in the conversion of starch to glucose is [KCET 1984] |
| A. | Lactose |
| B. | Sucrose |
| C. | Maltose |
| D. | Fructose |
| Answer» D. Fructose | |
| 8191. |
Which statement is not true concerning alkanes [MP PET 2003] |
| A. | Large number alkanes are soluble in water |
| B. | All alkanes have a lower density than water |
| C. | At room temperature some alkanes are liquids, some solids and some gases |
| D. | All alkanes burn |
| Answer» B. All alkanes have a lower density than water | |
| 8192. |
Which one of the following substances adsorb hydrogen gas most strongly |
| A. | Activated carbon |
| B. | Silica gel |
| C. | Platinum black |
| D. | Iron powder |
| Answer» D. Iron powder | |
| 8193. |
The reaction of propene with HOCl proceeds via the addition of [IIT-JEE (Screening) 2001] |
| A. | \[{{H}^{+}}\]in the first step |
| B. | \[C{{l}^{+}}\]in the first step |
| C. | \[O{{H}^{-}}\]in the first step |
| D. | \[C{{l}^{+}}\]and \[O{{H}^{-}}\]in a single step |
| Answer» E. | |
| 8194. |
The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B |
| A. | \[\frac{y}{2}\] |
| B. | \[\frac{y}{4}\] |
| C. | y |
| D. | 2y |
| Answer» D. 2y | |
| 8195. |
Which of the following has most density [CPMT 1996] |
| A. | \[Fe\] |
| B. | \[Cu\] |
| C. | \[B\] |
| D. | \[Pb\] |
| Answer» E. | |
| 8196. |
For a reaction, activation energy \[({{E}_{a}})=0\] and rate constant \[(K)=3.2\times {{10}^{6}}{{s}^{-1}}\]at 300 K. What is the value of the rate constant at 310 K [KCET (Med.) 1999] |
| A. | \[3.2\times {{10}^{-12}}{{s}^{-1}}\] |
| B. | \[3.2\times {{10}^{6}}{{s}^{-1}}\] |
| C. | \[6.4\times {{10}^{12}}{{s}^{-1}}\] |
| D. | \[6.4\times {{10}^{6}}{{s}^{-1}}\] |
| Answer» C. \[6.4\times {{10}^{12}}{{s}^{-1}}\] | |
| 8197. |
Hoop's process is used for the purification of the metal [MP PET 1995; MP PMT 2001] |
| A. | \[Al\] |
| B. | \[Zn\] |
| C. | \[Ag\] |
| D. | \[Cu\] |
| Answer» B. \[Zn\] | |
| 8198. |
In electrolysis of aluminium oxide which of the following is added to accelerate the process [AFMC 1999; CPMT 1999] |
| A. | Silica |
| B. | Cryolite |
| C. | Nickel |
| D. | Silicate |
| Answer» C. Nickel | |
| 8199. |
Dimethyl glyoxime gives a red precipitate with \[N{{i}^{2+}},\] which is used for its detection. To get this precipitate readily the best pH range is [AIIMS 2004] |
| A. | < 1 |
| B. | 44257 |
| C. | 44289 |
| D. | 44509 |
| Answer» E. | |
| 8200. |
Carbon suboxide \[{{C}_{3}}{{O}_{2}}\] has [DCE 2003] |
| A. | Linear structure |
| B. | Bent structure |
| C. | Trigonal planar structure |
| D. | Distorted tetrahedral structure |
| Answer» B. Bent structure | |