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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.
| 8101. |
If the atomic weight of an element is 23 times that of the lightest element and it has 11 protons, then it contains [EAMCET 1986; AFMC 1989] |
| A. | 11 protons, 23 neutrons, 11 electrons |
| B. | 11 protons, 11 neutrons, 11 electrons |
| C. | 11 protons, 12 neutrons, 11 electrons |
| D. | 11 protons, 11 neutrons, 23 electrons |
| Answer» D. 11 protons, 11 neutrons, 23 electrons | |
| 8102. |
Pyridine is less basic than triethylamine because [AIIMS 2005] |
| A. | Pyridine has aromatic character |
| B. | Nitrogen in pyridine is \[s{{p}^{2}}\] hybridized |
| C. | Pyridine is a cyclic system |
| D. | In pyridine, lone pair of nitrogen is delocalized |
| Answer» E. | |
| 8103. |
Which of the following is the correct statement for red lead [AIIMS 2000] |
| A. | It is an active form of lead |
| B. | Its molecular formula is \[P{{b}_{2}}{{O}_{3}}\] |
| C. | It decomposes into Pb and \[C{{O}_{2}}\] |
| D. | It decomposes into \[Xe{{F}_{6}}\] and \[{{O}_{2}}\] |
| Answer» E. | |
| 8104. |
The enolic form of acetone contains [Pb. PMT 2002] |
| A. | 8\[\sigma \]bonds, \[2\pi \]-bonds and 1 lone pairs |
| B. | \[9\sigma \]-bonds, \[1\pi \]-bond and 2 lone pairs |
| C. | \[9\sigma \]-bonds, \[2\pi \]-bonds and 1 lone pairs |
| D. | 10\[\sigma \]-bonds, 1\[\pi \]-bonds and 1 lone pairs |
| Answer» C. \[9\sigma \]-bonds, \[2\pi \]-bonds and 1 lone pairs | |
| 8105. |
In the cyanide process for the extraction of silver, sodium cyanide is used to [MP PMT 1994] |
| A. | Convert silver into a soluble silver complex |
| B. | Reduce silver |
| C. | Precipitate silver |
| D. | Oxidise silver |
| Answer» B. Reduce silver | |
| 8106. |
Which of the following is not true about potash alum [MNR 1993; UPSEAT 2002] |
| A. | Its empirical formula is \[KAl{{(S{{O}_{4}})}_{2}}.12{{H}_{2}}O\] |
| B. | Its aqueous solution is basic |
| C. | It is used in dyeing industries |
| D. | On heating it melts in its water of crystallization |
| Answer» B. Its aqueous solution is basic | |
| 8107. |
\[CH\equiv CH\underset{{{H}_{2}}S{{O}_{4}}}{\mathop{\xrightarrow{{{H}_{2}}O/H{{g}^{2+}}}}}\,X\xrightarrow{LiAl{{H}_{4}}}Y\xrightarrow{{{P}_{4}}/B{{r}_{2}}}Z\]Here Z is [JIPMER 2002] |
| A. | Ethylene bromide |
| B. | Ethanol |
| C. | Ethyl bromide |
| D. | Ethylidene bromide |
| Answer» D. Ethylidene bromide | |
| 8108. |
Which of the following does not react with \[PC{{l}_{5}}\] [CPMT 1973] |
| A. | \[C{{H}_{3}}OH\] |
| B. | \[C{{H}_{3}}COOH\] |
| C. | \[C{{H}_{3}}CHO\] |
| D. | \[{{C}_{2}}{{H}_{6}}\] |
| Answer» E. | |
| 8109. |
The compound formed as a result of potassium permanganate oxidation of ethylbenzene is [MP PET/PMT 1998] |
| A. | Benzoic acid |
| B. | Benzyl alcohol |
| C. | Benzophenone |
| D. | Acetophenone |
| Answer» B. Benzyl alcohol | |
| 8110. |
When lead storage battery is charged [MP PET 1993; MP PMT 2000] |
| A. | Lead dioxide dissolves |
| B. | Sulphuric acid is regenerated |
| C. | The lead electrode becomes coated with lead sulphate |
| D. | The amount of sulphuric acid decreases |
| Answer» C. The lead electrode becomes coated with lead sulphate | |
| 8111. |
In the viscose process the solvent for cellulose consists of [JIPMER 1999] |
| A. | Ether and alcohol |
| B. | Copper sulphate and ammonia |
| C. | Sodium hydroxide and carbon disulphide |
| D. | Acetic acid and acetic anhydride |
| Answer» D. Acetic acid and acetic anhydride | |
| 8112. |
Methane and ethane both can be obtained in single step from [CPMT 1974; MP PET 1995; AFMC 1998, 2000; BHU 2005] |
| A. | \[C{{H}_{3}}I\] |
| B. | \[{{C}_{2}}{{H}_{5}}I\] |
| C. | \[C{{H}_{3}}OH\] |
| D. | \[{{C}_{2}}{{H}_{5}}OH\] |
| Answer» B. \[{{C}_{2}}{{H}_{5}}I\] | |
| 8113. |
If electron falls from \[n=3\] to \[n=2\], then emitted energy is [AFMC 1997; MP PET 2003] |
| A. | \[10.2eV\] |
| B. | \[12.09eV\] |
| C. | \[1.9eV\] |
| D. | \[0.65eV\] |
| Answer» D. \[0.65eV\] | |
| 8114. |
What is the concentration of nitrate ions if equal volumes of 0.1 \[M\,AgN{{O}_{3}}\]and 0.1 \[M\,NaCl\]are mixed together [CPMT 1983; NCERT 1985] |
| A. | 0.1 M |
| B. | 0.2 M |
| C. | 0.05 M |
| D. | 0.25 M |
| Answer» D. 0.25 M | |
| 8115. |
Which among the following is the simplest [CPMT 1999] |
| A. | Glucose |
| B. | Cellulose |
| C. | Starch |
| D. | None of these |
| Answer» B. Cellulose | |
| 8116. |
Coordination compounds have great importance in biological systems. In this context which of the following statements is incorrect [AIEEE 2004] |
| A. | Cyanocobalamin is \[{{B}_{12}}\] and contains cobalt. |
| B. | Haemoglobin is the red pigment of blood and contains iron. |
| C. | Chlorophylls are green pigments in plants and contains calcium. |
| D. | Carboxypepticase-A is an enzyme and contains zinc. |
| Answer» D. Carboxypepticase-A is an enzyme and contains zinc. | |
| 8117. |
What will be the effect of increase in temperature on physical adsorption [Pb. CET 2000] |
| A. | It will decrease |
| B. | It will increase |
| C. | First increase then decrease |
| D. | None of these |
| Answer» B. It will increase | |
| 8118. |
Steel contains [MP PMT 1989; KCET 2000] |
| A. | \[Fe+C+Mn\] |
| B. | \[Fe+C+Al\] |
| C. | \[Fe+Mn\] |
| D. | \[Fe+Mn+Cr\] |
| Answer» B. \[Fe+C+Al\] | |
| 8119. |
The volume of a gas decreases from \[500\,cc\] to \[300\,cc\] when a sample of gas is compressed by an average pressure of 0.6 atm. During this process 10 J of heat is liberated. The change in internal energy is [Pb. PMT 2000] |
| A. | ? 2.16 J |
| B. | 12.156 J |
| C. | 2.16 J |
| D. | 101.3 J |
| Answer» D. 101.3 J | |
| 8120. |
Which of the following compounds has coordinate (dative) bond [RPET 2003] |
| A. | \[C{{H}_{3}}NC\] |
| B. | \[C{{H}_{3}}OH\] |
| C. | \[C{{H}_{3}}Cl\] |
| D. | \[N{{H}_{3}}\] |
| Answer» B. \[C{{H}_{3}}OH\] | |
| 8121. |
\[C{{H}_{3}}-C{{H}_{2}}-Cl\xrightarrow{alc.KOH}A\], the product is [CPMT 2003] |
| A. | \[C{{H}_{3}}C{{H}_{2}}OK\] |
| B. | \[C{{H}_{3}}CHO\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}OC{{H}_{2}}C{{H}_{3}}\] |
| D. | \[C{{H}_{2}}=C{{H}_{2}}\] |
| Answer» E. | |
| 8122. |
Match List ?I and List-II and choose right one by using code given in list [Kerala CET 2005] List ? I List ?II Nuclear reactor Used substance Component 1. Moderator A Uranium 2. Control rods B Graphite 3. Fuel rods C Boron 4. Coolent D Lead E Sodiu |
| A. | 1-B 2-A 3-C 4-E |
| B. | 1-B 2-C 3-A 4-E |
| C. | 1-C 2-B 3-A 4-E |
| D. | 1-C 2-D 3-A 4-B |
| E. | 1-D 2-C 3-B 4-A |
| Answer» C. 1-C 2-B 3-A 4-E | |
| 8123. |
Which is not a polymer [CPMT 1994] |
| A. | Ice |
| B. | Starch |
| C. | Protein |
| D. | Cellulose |
| Answer» B. Starch | |
| 8124. |
The colloidal particles can pass through |
| A. | Filter paper as well as animal membrane |
| B. | Animal membrane but not through filter paper |
| C. | Filter paper but not through animal membrane |
| D. | Semipermeable membrane |
| Answer» D. Semipermeable membrane | |
| 8125. |
The solubility product of \[A{{g}_{2}}Cr{{O}_{4}}\]is \[32\times {{10}^{-12}}\]. What is the concentration of \[CrO_{4}^{-}\] ions in that solution [BHU 1997; DPMT 2004] |
| A. | \[2\times {{10}^{-4}}\,m/s\] |
| B. | \[16\times {{10}^{-4}}\,m/s\] |
| C. | \[8\times {{10}^{-4}}\,m/s\] |
| D. | \[8\times {{10}^{-8}}\,m/s\] |
| Answer» B. \[16\times {{10}^{-4}}\,m/s\] | |
| 8126. |
The number of moles of \[KMn{{O}_{4}}\] reduced by one mole of KI in alkaline medium is [CBSE PMT 2005] |
| A. | One fifth |
| B. | Five |
| C. | One |
| D. | Two |
| Answer» E. | |
| 8127. |
The hybridisation present in \[{{C}_{2}}{{H}_{2}}\] is [EAMCET 1993] |
| A. | \[sp\] |
| B. | \[s{{p}^{2}}\] |
| C. | \[s{{p}^{3}}\] |
| D. | \[ds{{p}^{2}}\] |
| Answer» B. \[s{{p}^{2}}\] | |
| 8128. |
Number of \[\pi \] electrons in cyclobutadienyl anion \[{{({{C}_{4}}{{H}_{4}})}^{-2}}\] is [IIT-JEE 1991] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 8129. |
The rate constant is given by the equation \[k=pz{{e}^{-E/RT}}\]. Which factor should register a decrease for the reaction to proceed more rapidly [MP PET/PMT 1998] |
| A. | \[T\] |
| B. | \[Z\] |
| C. | \[E\] |
| D. | \[p\] |
| Answer» D. \[p\] | |
| 8130. |
An alkene on ozonolysis gave acetaldehyde the alkene is |
| A. | Ethylene |
| B. | Propene |
| C. | 1-butene |
| D. | 2-butene |
| Answer» C. 1-butene | |
| 8131. |
Which of the following is a branched polymer |
| A. | Low density polymer |
| B. | Polyester |
| C. | High density polymer |
| D. | Nylon |
| Answer» B. Polyester | |
| 8132. |
Which of the following cannot be hydrolysed [MP PMT 1996] |
| A. | A salt of weak acid and strong base |
| B. | A salt of strong acid and weak base |
| C. | A salt of weak acid and weak base |
| D. | A salt of strong acid and strong base |
| Answer» E. | |
| 8133. |
Number of \[\sigma \] and \[\pi \]bonds present in 1- butene-3-yne respectively are [RPMT 1999; MP PET 2000; DCE 2000] |
| A. | \[7\sigma ,\,3\pi \] |
| B. | \[5\sigma ,\,2\pi \] |
| C. | \[8\sigma ,3\pi \] |
| D. | \[6\sigma ,2\pi \] |
| Answer» B. \[5\sigma ,\,2\pi \] | |
| 8134. |
Which of the following is zero for an isochoric process |
| A. | \[dP\] |
| B. | \[dV\] |
| C. | \[dT\] |
| D. | \[dE\] |
| Answer» C. \[dT\] | |
| 8135. |
The energy of a photon is calculated by [Pb. PMT 2000] |
| A. | \[E=h\nu \] |
| B. | \[h=E\nu \] |
| C. | \[h=\frac{E}{\nu }\] |
| D. | \[E=\frac{h}{\nu }\] |
| Answer» B. \[h=E\nu \] | |
| 8136. |
Pair of metals which dissolves in \[NaOH\] solution |
| A. | \[Al,\,Cu\] |
| B. | \[Zn,\,Hg\] |
| C. | \[Zn,\,Cu\] |
| D. | \[Zn,\,Al\] |
| Answer» E. | |
| 8137. |
Which of the following is a hydrocarbon [AFMC 1992] |
| A. | Urea |
| B. | Benzene |
| C. | Ammonium cyanate |
| D. | Phenol |
| Answer» C. Ammonium cyanate | |
| 8138. |
Formula of ferric sulphate is [AFMC 2003] |
| A. | \[FeS{{O}_{4}}\] |
| B. | \[Fe\,\,{{(S{{O}_{4}})}_{2}}\] |
| C. | \[F{{e}_{2}}S{{O}_{4}}\] |
| D. | \[F{{e}_{2}}\,{{(S{{O}_{4}})}_{3}}\] |
| Answer» E. | |
| 8139. |
Which one gives only one monosubstitution product on chlorination [AIEEE 2003] |
| A. | n-pentane |
| B. | Neopentane |
| C. | Isopentane |
| D. | n-butane |
| Answer» C. Isopentane | |
| 8140. |
Which of following having delocalised electron [BCECE 2005] |
| A. | Benzene |
| B. | Cyclohexane |
| C. | CH4 |
| D. | C2H6 |
| Answer» B. Cyclohexane | |
| 8141. |
The molar heat capacity of water at constant pressure is \[75\,\,J{{K}^{-1}}mo{{l}^{-1}}\]. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand the increase in temperature of water is [CBSE PMT 2003] |
| A. | 6.6 K |
| B. | 1.2 K |
| C. | 2.4 K |
| D. | 4.8 K |
| Answer» D. 4.8 K | |
| 8142. |
Which of the following is a step-growth polymer |
| A. | Polyisoprene |
| B. | Polythene |
| C. | Nylon |
| D. | Polyacrylonitrile |
| Answer» D. Polyacrylonitrile | |
| 8143. |
Relation between rate constant and temperature by Arrhenius equation is |
| A. | \[{{\log }_{e}}A={{\log }_{e}}K+\frac{{{E}_{a}}}{RT}\] |
| B. | \[\log \,K=A\,\frac{{{E}_{a}}}{RT}\] |
| C. | \[{{\log }_{e}}K={{\log }_{e}}A-\frac{{{E}_{a}}}{R{{T}^{2}}}\] |
| D. | \[\log A=RT\,\ln \,{{E}_{a}}-\ln \,K\] |
| Answer» B. \[\log \,K=A\,\frac{{{E}_{a}}}{RT}\] | |
| 8144. |
Which of the following will be the final product when \[{{C}_{2}}{{H}_{2}}\] reacts with HCl [DPMT 1984; AFMC 1982; Bihar MEE 1982] |
| A. | \[\underset{CHCl}{\mathop{\overset{CH\,\,\,\,\,}{\mathop{|\,|\,\,\,\,\,\,\,\,\,}}\,}}\,\] |
| B. | \[\underset{CHC{{l}_{2}}}{\mathop{\overset{C{{H}_{3}}\,\,\,\,}{\mathop{|\,\,\,\,\,\,\,\,\,\,}}\,}}\,\] |
| C. | \[\underset{CHCl}{\mathop{\overset{CHCl}{\mathop{|\,|\,\,\,\,\,\,\,\,}}\,}}\,\] |
| D. | None of these |
| Answer» C. \[\underset{CHCl}{\mathop{\overset{CHCl}{\mathop{|\,|\,\,\,\,\,\,\,\,}}\,}}\,\] | |
| 8145. |
Which one of the following has the minimum boiling point [AIEEE 2004] |
| A. | 1-Butene |
| B. | 1-Butyne |
| C. | n-Butane |
| D. | Isobutane |
| Answer» E. | |
| 8146. |
When the value of entropy is greater, then the ability of work |
| A. | Is maximum |
| B. | Is minimum |
| C. | Is medium |
| D. | None of these |
| Answer» B. Is minimum | |
| 8147. |
Which of the following is the strongest conjugate base [MADT Bihar 1983; CBSE PMT 1999; KCET (Med.) 2001] |
| A. | \[C{{l}^{-}}\] |
| B. | \[C{{H}_{3}}CO{{O}^{-}}\] |
| C. | \[S{{O}_{4}}^{--}\] |
| D. | \[N{{O}_{2}}^{-}\] |
| Answer» C. \[S{{O}_{4}}^{--}\] | |
| 8148. |
Equation \[_{17}C{{l}^{37}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{18}}A{{r}^{38}}+{{\,}_{0}}{{n}^{1}}\] is [MP PMT 1989] |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Transformation of chlorin |
| D. | Synthesis of argon |
| Answer» D. Synthesis of argon | |
| 8149. |
Hydrogen bomb is based on the phenomenon of [EAMCET 1980; CPMT 1984, 96; MP PMT 1993, 95, 2002; RPET 1999] |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Nuclear explosion |
| D. | Disintegration |
| Answer» C. Nuclear explosion | |
| 8150. |
The intensive property among these quantities is [KCET 2002] |
| A. | Enthalpy |
| B. | Mass/volume |
| C. | Mass |
| D. | Volume |
| Answer» C. Mass | |