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.
| 10101. |
Which of the following is isoelectronic with carbon atom [MP PMT 1994; UPSEAT 2000] |
| A. | \[N{{a}^{+}}\] |
| B. | \[A{{l}^{3+}}\] |
| C. | \[{{O}^{2-}}\] |
| D. | \[{{N}^{+}}\] |
| Answer» E. | |
| 10102. |
Which of the following is synthetic rubber [NCERT 1978] |
| A. | Buna-S |
| B. | Neoprene |
| C. | Both A and B |
| D. | None of these |
| Answer» D. None of these | |
| 10103. |
A radium \[_{88}R{{a}^{224}}\] isotope, on emission of an \[\alpha \]-particle gives rise to a new element whose mass number and atomic number will be [CPMT 1980; EAMCET 1985; MP PMT 1993] |
| A. | 220 and 86 |
| B. | 225 and 87 |
| C. | 228 and 88 |
| D. | 224 and 86 |
| Answer» B. 225 and 87 | |
| 10104. |
\[{{[Sc{{({{H}_{2}}O)}_{6}}]}^{3+}}\] ion is [Pb. CET 2004] |
| A. | Colourless and diamagnetic |
| B. | Coloured and octahedral |
| C. | Colourless and paramagnetic |
| D. | Coloured and paramagnetic |
| Answer» B. Coloured and octahedral | |
| 10105. |
The IUPAC name of \[C{{H}_{3}}-\underset{C{{l}_{{}}}\,}{\mathop{\underset{|\,\,\,\,}{\mathop{C=}}\,}}\,\underset{C{{H}_{3}}\,}{\mathop{\underset{|\,\,\,\,\,\,}{\mathop{C\,-}}\,}}\,\underset{{{C}_{2}}{{H}_{5}}\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\mathop{CH-\,}}\,}}\,C{{H}_{2}}-C\equiv CH\] is [MP PET 1997] |
| A. | 6-chloro-4-ethyl-5-methyl-hept-5-en-1-yne |
| B. | 6-chloro-4-ethyl-5-methyl-hept-1-yn-5-ene |
| C. | 2-chloro-4-ethyl-3-methyl-hept-2-en-6-yne |
| D. | 2-chloro-4-ethyl-3-methyl-hept-6-yn-2-ene |
| Answer» B. 6-chloro-4-ethyl-5-methyl-hept-1-yn-5-ene | |
| 10106. |
Which is the correct structure of the compound 3-hexyn-1-oic acid |
| A. | \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C\equiv C-COOH\] |
| B. | \[C{{H}_{3}}-C{{H}_{2}}-C\equiv C-C{{H}_{2}}-COOH\] |
| C. | \[C{{H}_{3}}-C\equiv C-C{{H}_{2}}-C{{H}_{2}}-COOH\] |
| D. | \[C{{H}_{3}}-C{{H}_{2}}-CH=CH-C{{H}_{2}}-COOH\] |
| Answer» C. \[C{{H}_{3}}-C\equiv C-C{{H}_{2}}-C{{H}_{2}}-COOH\] | |
| 10107. |
The IUPAC name of the compound having the formula \[C{{l}_{3}}C.C{{H}_{2}}CHO\] is [MP PET/PMT 1998] |
| A. | 3, 3, 3-trichloropropanal |
| B. | 1, 1, 1-trichloropropanal |
| C. | 2, 2, 2-trichloropropanal |
| D. | Chloral |
| Answer» B. 1, 1, 1-trichloropropanal | |
| 10108. |
In shaving cream, the dispersion medium is |
| A. | Liquid |
| B. | Gas |
| C. | Solid |
| D. | None of these |
| Answer» B. Gas | |
| 10109. |
Normality of 2M sulphuric acid is [AIIMS 1992] |
| A. | 2N |
| B. | 4N |
| C. | \[\frac{N}{2}\] |
| D. | \[\frac{N}{4}\] |
| Answer» C. \[\frac{N}{2}\] | |
| 10110. |
Plaster of paris is used [Pb. CET 2000; CPMT 2000] |
| A. | In surgery and dentistry |
| B. | As a white wash |
| C. | As a constituent of tooth paste |
| D. | For the preparation of RCC |
| Answer» B. As a white wash | |
| 10111. |
Slow acting nitrogenous fertilizer among the following is [DCE 2003] |
| A. | \[N{{H}_{2}}CON{{H}_{2}}\] |
| B. | \[N{{H}_{4}}N{{O}_{3}}\] |
| C. | \[CaNCN\] |
| D. | \[KN{{O}_{3}}\] |
| Answer» C. \[CaNCN\] | |
| 10112. |
Which of the following is always a whole number [CPMT 1976, 81, 86] |
| A. | Atomic weight |
| B. | Atomic radii |
| C. | Equivalent weight |
| D. | Atomic number |
| Answer» E. | |
| 10113. |
Which of the following colloids are formed when hydrogen sulphide gas is passed through a cold solution of arsenious oxide [CPMT 2000] |
| A. | \[A{{s}_{2}}{{S}_{3}}\] |
| B. | \[A{{s}_{2}}{{O}_{3}}\] |
| C. | \[A{{s}_{2}}S\] |
| D. | \[A{{s}_{2}}{{H}_{2}}\] |
| Answer» B. \[A{{s}_{2}}{{O}_{3}}\] | |
| 10114. |
Conjugate base of \[HPO_{4}^{2-}\] is [MP PMT 1995] |
| A. | \[PO_{4}^{3-}\] |
| B. | \[{{H}_{2}}PO_{4}^{-}\] |
| C. | \[{{H}_{3}}P{{O}_{4}}\] |
| D. | \[{{H}_{4}}P{{O}_{3}}\] |
| Answer» B. \[{{H}_{2}}PO_{4}^{-}\] | |
| 10115. |
The oxide, which is best soluble in \[{{H}_{2}}O\] is [BHU 2001] |
| A. | \[Ba{{(OH)}_{2}}\] |
| B. | \[Mg{{(OH)}_{2}}\] |
| C. | \[{{K}^{+}},\,HCO_{3}^{-}\] |
| D. | \[Ca{{(OH)}_{2}}\] |
| Answer» B. \[Mg{{(OH)}_{2}}\] | |
| 10116. |
Beryllium differs from rest of the members of its family (Group-IIA) in many ways. The reason for this is its [MP PMT 1997] |
| A. | Small size and higher electronegativity |
| B. | Small size and lower electronegativity |
| C. | Large size and lower ionisation energy |
| D. | Large size and largest ionic radius |
| Answer» B. Small size and lower electronegativity | |
| 10117. |
Point out the incorrect statement regarding \[Be\] (Group-IIA) [MP PMT 1997] |
| A. | It forms an ionic carbide |
| B. | Its carbonate decomposes on heating |
| C. | Its halides are covalent |
| D. | It is easily attacked by water |
| Answer» E. | |
| 10118. |
Setting of cement is an [DPMT 1984] |
| A. | Exothermic reaction |
| B. | Endothermic reaction |
| C. | Neither exothermic nor endothermic |
| D. | None of these |
| Answer» B. Endothermic reaction | |
| 10119. |
To prevent rancidification of food material, which of the following is added [CPMT 1996] |
| A. | Reducing agent |
| B. | Anti-oxidant |
| C. | Oxidising agent |
| D. | None of these |
| Answer» C. Oxidising agent | |
| 10120. |
A metal M readily forms its sulphate \[MS{{O}_{4}}\] which is water-soluble. It forms its oxide \[MO\] which becomes inert on heating. It forms its insoluble hydroxide \[M{{(OH)}_{2}}\] which is soluble in \[NaOH\] solution. Then M is [AIEEE 2002] |
| A. | \[Mg\] |
| B. | \[Ba\] |
| C. | \[Ca\] |
| D. | \[Be\] |
| Answer» E. | |
| 10121. |
In the lime (kiln), the reaction \[CaC{{O}_{3}}(s)\to C{{O}_{2}}(g)\] goes to completion because [Kerala (Engg.) 2002] |
| A. | Of high temperature |
| B. | CaO is more stable than \[CaC{{O}_{3}}\] |
| C. | \[C{{O}_{2}}\] escapes simultaneously |
| D. | CaO is not dissociated |
| Answer» D. CaO is not dissociated | |
| 10122. |
The vapor density of completely dissociated \[N{{H}_{4}}Cl\] would be [NCERT 1974] |
| A. | Slight less than half that of \[N{{H}_{4}}Cl\] |
| B. | Half that of \[N{{H}_{4}}Cl\] |
| C. | Double that of \[N{{H}_{4}}Cl\] |
| D. | Determined by the amount of solid \[N{{H}_{4}}Cl\] in the experiment |
| Answer» C. Double that of \[N{{H}_{4}}Cl\] | |
| 10123. |
Consider an endothermic reaction \[X\to Y\] with the activation energies \[{{E}_{b}}\] and \[{{E}_{f}}\] for the backward and forward reactions, respectively, in general [AIEEE 2005] |
| A. | \[{{E}_{b}}<{{E}_{f}}\] |
| B. | \[{{E}_{b}}>{{E}_{f}}\] |
| C. | \[{{E}_{b}}={{E}_{f}}\] |
| D. | There is no definite relation between \[{{E}_{b}}\] and \[{{E}_{f}}\] |
| Answer» B. \[{{E}_{b}}>{{E}_{f}}\] | |
| 10124. |
The role of a catalyst in a reversible reaction is to [KCET (Med.) 2001] |
| A. | Increase the rate of forward reaction |
| B. | Decrease the rate of backward reaction |
| C. | Alter the equilibrium constant of the reaction |
| D. | Allow the equilibrium to be achieved quickly |
| Answer» E. | |
| 10125. |
Anhydrous \[AlC{{l}_{3}}\] is obtained from [BHU 1980; CPMT 1982] |
| A. | \[HCl\] and aluminium metal |
| B. | Aluminium and chlorine gas |
| C. | Hydrogen chloride gas and aluminium metal |
| D. | None of the above |
| Answer» D. None of the above | |
| 10126. |
Cuprous ion is colourless, while cupric ion is coloured because [EAMCET 1992; BHU 2002] |
| A. | Both have unpaired electrons in \[d\]-orbital |
| B. | Cuprous ion has a completed \[d\]-orbital and cupric ion has an incomplete \[d\]-orbital |
| C. | Both have half-filled \[p\]and \[d\]-orbitals |
| D. | Cuprous ion has incomplete \[d\]-orbital and cupric ion has a completed \[d\]-orbital |
| Answer» C. Both have half-filled \[p\]and \[d\]-orbitals | |
| 10127. |
Which of the following conditions will always lead to a non-spontaneous change [AMU 2000; KCET (Med.) 2000] |
| A. | Positive \[\Delta H\] and positive \[\Delta S\] |
| B. | Negative \[\Delta H\] and negative \[\Delta S\] |
| C. | Positive \[\Delta H\] and negative \[\Delta S\] |
| D. | Negative \[\Delta H\] and positive \[\Delta S\] |
| Answer» D. Negative \[\Delta H\] and positive \[\Delta S\] | |
| 10128. |
Soda ash is [KCET 1993] |
| A. | \[N{{a}_{2}}C{{O}_{3}}.{{H}_{2}}O\] |
| B. | \[NaOH\] |
| C. | \[N{{a}_{2}}C{{O}_{3}}\] |
| D. | \[NaHC{{O}_{3}}\] |
| Answer» D. \[NaHC{{O}_{3}}\] | |
| 10129. |
Soda lime is [KCET 1993] |
| A. | \[NaOH\] |
| B. | \[CaO\] |
| C. | \[NaOH\] and \[CaO\] |
| D. | \[N{{a}_{2}}C{{O}_{3}}\] |
| Answer» D. \[N{{a}_{2}}C{{O}_{3}}\] | |
| 10130. |
Photochemical chlorination of alkane is initiated by a process of [DPMT 1985; NCERT 1978] |
| A. | Pyrolysis |
| B. | Substitution |
| C. | Homolysis |
| D. | Peroxidation |
| Answer» D. Peroxidation | |
| 10131. |
Which of the following statements about galvanic cell is incorrect [JIPMER 1997] |
| A. | Anode is positive |
| B. | Oxidation occurs at the electrode with lower reduction potential |
| C. | Cathode is positive |
| D. | Reduction occurs at cathode |
| Answer» B. Oxidation occurs at the electrode with lower reduction potential | |
| 10132. |
\[{{\lambda }_{ClC{{H}_{2}}COONa}}=224\,oh{{m}^{-1}}c{{m}^{2}}gme{{q}^{-1}}\], \[{{\lambda }_{NaCl}}=38.2\,oh{{m}^{-1}}c{{m}^{2}}gme{{q}^{-1}}\], \[{{\lambda }_{HCl}}=203\,oh{{m}^{-1}}c{{m}^{2}}gme{{q}^{-1}}\], What is the value of \[{{\lambda }_{ClC{{H}_{2}}COOH}}\] [JEE Orissa 2004] |
| A. | \[288.5\ oh{{m}^{-1}}c{{m}^{2}}gme{{q}^{-1}}\] |
| B. | \[289.5\ oh{{m}^{-1}}c{{m}^{2}}gme{{q}^{-1}}\] |
| C. | \[388.5\ oh{{m}^{-1}}c{{m}^{2}}gme{{q}^{-1}}\] |
| D. | \[59.5\ oh{{m}^{-1}}c{{m}^{2}}gme{{q}^{-1}}\] |
| Answer» D. \[59.5\ oh{{m}^{-1}}c{{m}^{2}}gme{{q}^{-1}}\] | |
| 10133. |
On the addition of a solution containing \[Cr{{O}_{4}}^{2-}\]ions to the solution of \[B{{a}^{2+}},\,\,S{{r}^{2+}}\] and \[C{{a}^{2+}}\]ions, the precipitate obtained first will be of [MP PMT 1993] |
| A. | \[CaCr{{O}_{4}}\] |
| B. | \[SrCr{{O}_{4}}\] |
| C. | \[BaCr{{O}_{4}}\] |
| D. | Mixture of A, B, C |
| Answer» D. Mixture of A, B, C | |
| 10134. |
A certain nuclide has a half-life period of 30 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, how many atoms will remain [NCERT 1978] |
| A. | 200 atoms |
| B. | 450 atoms |
| C. | 75 atoms |
| D. | 500 atoms |
| Answer» D. 500 atoms | |
| 10135. |
Bone ash contains [KCET 1992] |
| A. | \[CaO\] |
| B. | \[CaS{{O}_{4}}\] |
| C. | \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\] |
| D. | \[Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}\] |
| Answer» D. \[Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}\] | |
| 10136. |
According to Bohr?s principle, the relation between principle quantum number \[(n)\] and radius of orbit is [BHU 2004] |
| A. | \[r\propto n\] |
| B. | \[r\propto {{n}^{2}}\] |
| C. | \[r\propto \frac{1}{n}\] |
| D. | \[r\propto \frac{1}{{{n}^{2}}}\] |
| Answer» C. \[r\propto \frac{1}{n}\] | |
| 10137. |
Benzene cannot undergo |
| A. | Substitution |
| B. | Addition |
| C. | Elimination |
| D. | Oxidation |
| Answer» D. Oxidation | |
| 10138. |
The compound that is not olefinic organometallic is |
| A. | \[K\left[ {{C}_{2}}{{H}_{4}}PtC{{l}_{3}} \right].3{{H}_{2}}O\] |
| B. | \[Be{{(C{{H}_{2}})}_{2}}\] |
| C. | \[{{({{C}_{2}}{{H}_{4}}PtC{{l}_{3}})}_{2}}\] |
| D. | \[{{C}_{4}}{{H}_{4}}Fe{{(CO)}_{3}}\] |
| Answer» B. \[Be{{(C{{H}_{2}})}_{2}}\] | |
| 10139. |
The number of unpaired electrons in \[Z{{n}^{2+}}\] is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 0 |
| Answer» E. | |
| 10140. |
Orthoboric acid in aqueous medium is [AMU 2000] |
| A. | Monobasic |
| B. | Dibasic |
| C. | Tribasic |
| D. | All are correct |
| Answer» B. Dibasic | |
| 10141. |
Producer gas is a mixture of [Pb. CET 2002; UPSEAT 2004] |
| A. | \[CO\] and \[{{N}_{2}}\] |
| B. | \[C{{O}_{2}}\] and \[{{H}_{2}}\] |
| C. | \[{{N}_{2}}\] and \[{{O}_{2}}\] |
| D. | \[C{{H}_{4}}\] and \[{{N}_{2}}\] |
| Answer» B. \[C{{O}_{2}}\] and \[{{H}_{2}}\] | |
| 10142. |
Which of the following is not a polymer |
| A. | Gun cotton |
| B. | Perspex |
| C. | Shellac (eg. lac shellac) |
| D. | Wax (eg. bees wax) |
| Answer» E. | |
| 10143. |
\[\underset{{{S}^{o}}(298\,K)\,{{K}^{-1}}mo{{l}^{-1}}}{\mathop{{{H}^{+}}(aq)}}\,+\underset{-10.7}{\mathop{O{{H}^{-}}(aq)}}\,\xrightarrow{{}}\underset{+70}{\mathop{{{H}_{2}}O(l)}}\,\] Standard entropy change for the above reaction is [DPMT 2004] |
| A. | \[60.3\,J{{K}^{-1}}mo{{l}^{-1}}\] |
| B. | \[80.7\,J{{K}^{-1}}mo{{l}^{-1}}\] |
| C. | \[-70\,J{{K}^{-1}}mo{{l}^{-1}}\] |
| D. | \[+10.7\,J{{K}^{-1}}mo{{l}^{-1}}\] |
| Answer» C. \[-70\,J{{K}^{-1}}mo{{l}^{-1}}\] | |
| 10144. |
When sodium reacts with ethyl iodide, which of the following hydrocarbons is produced [NCERT 1984; BHU 1982] |
| A. | Methane |
| B. | Ethane |
| C. | Butane |
| D. | Ethene |
| Answer» D. Ethene | |
| 10145. |
Alum is a water purifier because it [KCET 2005] |
| A. | Coagulates the impurities |
| B. | Softens hard water |
| C. | Gives taste |
| D. | Destroys the pathogenic bacteria |
| Answer» B. Softens hard water | |
| 10146. |
An appropriate method for molecular weight determination of chloroform is |
| A. | Regnault's method |
| B. | Diffusion method |
| C. | Vapour pressure method |
| D. | Victor Meyer's method |
| Answer» E. | |
| 10147. |
An organic compound contains \[C=74.0%,\] \[H=8.65%\] and \[N=17.3%\]. Its Empirical formula is [MP PMT 1986] |
| A. | \[{{C}_{5}}{{H}_{8}}N\] |
| B. | \[{{C}_{10}}{{H}_{12}}N\] |
| C. | \[{{C}_{5}}{{H}_{7}}N\] |
| D. | \[{{C}_{10}}{{H}_{14}}N\] |
| Answer» D. \[{{C}_{10}}{{H}_{14}}N\] | |
| 10148. |
If two light nuclei are fused together in nuclear reaction the average energy per nucleon [Pb. PMT 2001] |
| A. | Increases |
| B. | Cannot be determined |
| C. | Remains same |
| D. | Decreases |
| Answer» E. | |
| 10149. |
A compound has 50% carbon, 50% oxygen and approximate molecular weight is 290. Its molecular formula is [MP PET 1995] |
| A. | CO |
| B. | \[{{C}_{4}}{{O}_{3}}\] |
| C. | \[{{C}_{12}}{{O}_{9}}\] |
| D. | \[{{C}_{3}}{{O}_{3}}\] |
| Answer» D. \[{{C}_{3}}{{O}_{3}}\] | |
| 10150. |
A compound gave 80% carbon and 20 % hydrogen on analysis. The compound is possibly [MADT Bihar 1984; MP PMT 1986] |
| A. | \[{{C}_{6}}{{H}_{6}}\] |
| B. | \[{{C}_{2}}{{H}_{5}}OH\] |
| C. | \[{{C}_{2}}{{H}_{6}}\] |
| D. | \[CHC{{l}_{3}}\] |
| Answer» D. \[CHC{{l}_{3}}\] | |