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.
| 101. |
The solubility product of \[AgCl\] under standard conditions of temperature is given by [Kerala (Med.) 2003] |
| A. | \[1.6\times {{10}^{-5}}\] |
| B. | \[1.5\times {{10}^{-8}}\] |
| C. | \[3.2\times {{10}^{-10}}\] |
| D. | \[1.5\times {{10}^{-10}}\] |
| Answer» E. | |
| 102. |
Which is correct about Henry?s law [KCET 2002] |
| A. | The gas in contact with the liquid should behave as an ideal gas |
| B. | There should not be any chemical interaction between the gas and liquid |
| C. | The pressure applied should be high |
| D. | All of these |
| Answer» C. The pressure applied should be high | |
| 103. |
Neutralization of an acid with a base invariably results in the production of [CPMT 1983] |
| A. | \[{{H}_{3}}{{O}^{+}}\] |
| B. | \[O{{H}^{-}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[{{H}^{+}}\] and \[O{{H}^{-}}\] |
| Answer» D. \[{{H}^{+}}\] and \[O{{H}^{-}}\] | |
| 104. |
Which type of solid crystals will conduct heat and electricity [RPET 2000] |
| A. | Ionic |
| B. | Covalent |
| C. | Metallic |
| D. | Molecular |
| Answer» D. Molecular | |
| 105. |
Amongst the following chemical reactions, the one representing homogeneous catalysis is [MP PMT 1999] |
| A. | \[{{N}_{2}}(g)+3{{H}_{2}}(g)\xrightarrow{Fe}2N{{H}_{3}}(g)\] |
| B. | \[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{2NO}2S{{O}_{3}}(g)+2NO(g)\] |
| C. | \[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\] |
| D. | \[2S{{O}_{2}}(g)+{{O}_{2}}(g)\xrightarrow{{{V}_{2}}{{O}_{5}}}2S{{O}_{3}}(g)\] |
| Answer» C. \[CO(g)+3{{H}_{2}}(g)\xrightarrow{Ni}C{{H}_{4}}(g)+{{H}_{2}}O\] | |
| 106. |
Which of the following expressions represents the first law of thermodynamics? |
| A. | \[\Delta E=-q+W\] |
| B. | \[\Delta E=q-W\] |
| C. | \[\Delta E=q+W\] |
| D. | \[\Delta E=-q-W\] |
| Answer» D. \[\Delta E=-q-W\] | |
| 107. |
The following compound can exhibits \[\begin{matrix} C{{H}_{3}} \\ C{{H}_{3}} \\ \end{matrix}>\underset{\begin{smallmatrix} \\ \ \ C{{H}_{3}} \end{smallmatrix}}{\mathop{C=C}}\,\underset{\cancel{\,\,\,\,\,\,\,\,\,\,}}{\overset{{}}{\mathop{ |
| A. | Tautomerism |
| B. | Optical isomerism |
| C. | Geometrical isomerism |
| D. | Geometrical and optical isomerisms |
| Answer» C. Geometrical isomerism | |
| 108. |
Name the compound, that is not isomer with diethyl ether [IIT-JEE 1981; CPMT 1989; MADT Bihar 1995] |
| A. | n-propylmethyl ether |
| B. | Butane-1-ol |
| C. | 2-methylpropane-2-ol |
| D. | Butanone |
| Answer» E. | |
| 109. |
Which statement is true for cyclohexane [MP PET 1996] |
| A. | It has two possible isomers |
| B. | It has three conformations |
| C. | Boat conformation is most stable |
| D. | Chair and boat conformations differ in energy by 44 kJ/mol |
| Answer» E. | |
| 110. |
\[Zn|Z{{n}^{+2}}({{C}_{1}})||Z{{n}^{+2}}({{C}_{2}})|Zn\] For this cell \[\Delta G\] is negative if |
| A. | \[{{C}_{1}}={{C}_{2}}\] |
| B. | \[{{C}_{1}}>{{C}_{2}}\] |
| C. | \[{{C}_{2}}>{{C}_{1}}\] |
| D. | Both [a] and [c] are correct |
| Answer» D. Both [a] and [c] are correct | |
| 111. |
Boric acid is a weak monobasic acid and acts as Lewis acid |
| A. | By donating \[{{H}^{+}}\] |
| B. | By accepting \[O{{H}^{-}}\] |
| C. | By donating lone pair of electrons |
| D. | By accepting lone pair of electrons. |
| Answer» C. By donating lone pair of electrons | |
| 112. |
Addition of solution of oxalate to an aqueous solution of mixture of \[B{{a}^{++}},S{{r}^{++}}\] and \[C{{a}^{++}}\] will precipitate [MP PMT 1985] |
| A. | \[C{{a}^{++}}\] |
| B. | \[C{{a}^{++}}\] and \[S{{r}^{++}}\] |
| C. | \[B{{a}^{++}}\] and \[S{{r}^{++}}\] |
| D. | All the three |
| Answer» E. | |
| 113. |
Which compound is soluble in\[N{{H}_{4}}OH\] [AFMC 1987] |
| A. | \[PbC{{l}_{2}}\] |
| B. | \[PbS{{O}_{4}}\] |
| C. | \[AgCl\] |
| D. | \[CaC{{O}_{3}}\] |
| Answer» D. \[CaC{{O}_{3}}\] | |
| 114. |
In order to prepare one litre normal solution of KMnO4, how many gm of KMnO4 are required, if the solution is to be used in acid medium for oxidation [MP PET 2002] |
| A. | 158 gm |
| B. | 31.60 gm |
| C. | 62.0 gm |
| D. | 790 gm |
| Answer» C. 62.0 gm | |
| 115. |
The correct relationship between the boiling points of very dilute solutions of \[AlC{{l}_{3}}\,({{t}_{1}})\] and \[CaC{{l}_{2}}\,({{t}_{2}})\], having the same molar concentration is [CPMT 1983] |
| A. | \[{{t}_{1}}={{t}_{2}}\] |
| B. | \[{{t}_{1}}>{{t}_{2}}\] |
| C. | \[{{t}_{2}}>{{t}_{1}}\] |
| D. | \[{{t}_{2}}\ge {{t}_{1}}\] |
| Answer» C. \[{{t}_{2}}>{{t}_{1}}\] | |
| 116. |
The reduction potential of hydrogen half-cell will be negative if |
| A. | \[p({{H}_{2}})=2\,atm\,and\,[{{H}^{+}}]=2.0M\] |
| B. | \[p({{H}_{2}})=1\,atm\,and\,[{{H}^{+}}]=2.0M\] |
| C. | \[p({{H}_{2}})=1\,atm\,and\,[{{H}^{+}}]=1.0M\] |
| D. | \[p({{H}_{2}})=2\,atm\,and\,[{{H}^{+}}]=1.0M\] |
| Answer» E. | |
| 117. |
EMF of which of the following cells at 298 K is highest? Given, \[E_{\left( M{{g}^{2+}}/mg \right)}^{0}=-2.37V;\] \[E_{\left( C{{u}^{2}}/Cu \right)}^{0}=+2.34V;\] \[E_{\left( F{{e}^{2+}}/Fe \right)}^{0}=-0.44V;\] \[E_{\left( S{{n}^{2+}}/Sn \right)}^{0}=-0.14V;\] \[E_{\left( \frac{1}{2}B{{r}_{2}}/B{{r}^{-}} \right)}^{0}=+1.08V;\] |
| A. | \[Mg(s)|M{{g}^{2+}}(0.001M)|\]\[|C{{u}^{2+}}(0.0001M)|Cu(s)\] |
| B. | \[Fe(s)|F{{e}^{2+}}(0.001M)|\]\[|{{H}^{+}}(1M)|{{H}_{2}}(g)(1bar)|Pt(s)\] |
| C. | \[Sn(s)S{{n}^{2+}}(0.050M)|\]\[|{{H}^{+}}(0.020M)|{{H}_{2}}(g)(1bar)|Pt(s)\] |
| D. | \[Pt(s)|B{{r}_{2}}(l)|B{{r}^{+}}(0.010M)|\]\[|{{H}^{+}}(0.030M)|{{H}_{2}}(g)(1bar)|Pt(s)\] |
| Answer» B. \[Fe(s)|F{{e}^{2+}}(0.001M)|\]\[|{{H}^{+}}(1M)|{{H}_{2}}(g)(1bar)|Pt(s)\] | |
| 118. |
On electrolyzing the molten chloride of metal \[725\text{ }ml\] of \[C{{l}_{2}}\] liberated at \[25{}^\circ C\] and 740 mm Hg pressure at anode for every one gm of metal deposite at cathode. The formula of metal chloride is (GAM of metal \[=52.01\]) |
| A. | \[MCI\] |
| B. | \[MC{{I}_{2}}\] |
| C. | \[MC{{I}_{3}}\] |
| D. | \[MC{{I}_{4}}\] |
| Answer» D. \[MC{{I}_{4}}\] | |
| 119. |
Which of the following statements about amorphous solids is incorrect [KCET 2004] |
| A. | They melt over a range of temperature |
| B. | They are anisotropic |
| C. | There is no orderly arrangement of particles |
| D. | They are rigid and incompressible |
| Answer» C. There is no orderly arrangement of particles | |
| 120. |
When heated above \[916{}^\circ C,\] iron changes its bcc crystalline form to fcc without the change in the radius of atom. The ratio of the density of the crystal before heating and after heating is: |
| A. | 1.069 |
| B. | 0.918 |
| C. | 0.725 |
| D. | 1.231 |
| Answer» C. 0.725 | |
| 121. |
The normality of 1 M solution of \[{{H}_{3}}P{{O}_{4}}\] will be [AIIMS 1983, 91] |
| A. | 1 N |
| B. | 0.5 N |
| C. | 2 N |
| D. | 3 N |
| Answer» E. | |
| 122. |
The composition of sample of wustite is \[F{{e}_{0.93}}{{O}_{1.00}}\]. What percentage of the iron is present in the form of Fe (III)? |
| A. | 0.14 |
| B. | 0.1505 |
| C. | 0.17 |
| D. | 0.29 |
| Answer» C. 0.17 | |
| 123. |
Which of the following combustion reactions would give maximum energy output per unit mass fuel plus oxidant when used to propel a rocket? |
| A. | \[C(s)+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g),\,\,\Delta H=-394\,KJ/mol\] |
| B. | \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}{{H}_{2}}O(l),\,\Delta H=-285\,kJ/mol\] |
| C. | \[\frac{1}{2}{{H}_{2}}+\frac{1}{2}{{F}_{2}}\xrightarrow{{}}2HF(g),\,\Delta H=-271\,kJ/mol\] |
| D. | \[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l),\]\[\Delta H=-890\,kJ/mol\] |
| Answer» D. \[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g)+2{{H}_{2}}O(l),\]\[\Delta H=-890\,kJ/mol\] | |
| 124. |
For an electron if the uncertainty in velocity is \[\Delta \nu \], the uncertainty in its position \[(\Delta x)\] is given by [DPMT 2005] |
| A. | \[\frac{hm}{4\pi \Delta \nu }\] |
| B. | \[\frac{4\pi }{hm\Delta \nu }\] |
| C. | \[\frac{h}{4\pi m\Delta \nu }\] |
| D. | \[\frac{4\pi \ m}{h\ .\ \Delta \nu }\] |
| Answer» D. \[\frac{4\pi \ m}{h\ .\ \Delta \nu }\] | |
| 125. |
Which of the following sulphate is insoluble in water [MNR 1995] |
| A. | \[CuS{{O}_{4}}\] |
| B. | \[CdS{{O}_{4}}\] |
| C. | \[PbS{{O}_{4}}\] |
| D. | \[Bi{{\left( S{{O}_{4}} \right)}_{3}}\] |
| Answer» E. | |
| 126. |
2.76 g of silver carbonate (at mass of Ag 108) on being heated strongly yield a residue weighing |
| A. | 2.16 g |
| B. | 2.48 g |
| C. | 2.32 g |
| D. | 2.64 g |
| Answer» B. 2.48 g | |
| 127. |
The reaction of \[KMn{{O}_{4}}\] and \[HCl\] results in |
| A. | oxidation of Mn in\[KMn{{O}_{4}}\] and production of\[C{{l}_{2}}\]. |
| B. | reduction of Mn in \[KMn{{O}_{4}}\] and production of \[{{H}_{2}}\]. |
| C. | oxidation of Mn in \[KMn{{O}_{4}}\] and production of \[{{H}_{2}}\]. |
| D. | reduction of Mn in \[KMn{{O}_{4}}\] and production of\[C{{l}_{2}}\]. |
| Answer» E. | |
| 128. |
Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure lime stone \[(CaC{{O}_{3}}).\] |
| A. | 104.4 kg |
| B. | 105.4 kg |
| C. | 212.8 kg |
| D. | 106.4 kg |
| Answer» E. | |
| 129. |
The ionization energy of hydrogen atom (in the ground state) is x kJ. The energy required for an electron to jump from 2nd orbit to the \[{{3}^{rd}}\] orbit will be |
| A. | x/6 |
| B. | 5x |
| C. | 7.2 x |
| D. | 5x/36 |
| Answer» E. | |
| 130. |
The magnetic moment of a transition metal ion is found to be 5.92 BM. The number of unpaired electrons present in it is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 131. |
A catalyst is a substance which [Pb. CET 2004] |
| A. | Is always in the same phase as in the reactions |
| B. | Alters the equilibrium in a reaction |
| C. | Does not participate in the reaction but alters the rate of reaction |
| D. | Participates in the reaction and provide an easier pathway for the same |
| Answer» D. Participates in the reaction and provide an easier pathway for the same | |
| 132. |
Lyophilic sols are [IIT 2005] |
| A. | Irreversible sols |
| B. | They are prepared from inorganic compound |
| C. | Coagulated by adding electrolytes |
| D. | Self-stabilizing |
| Answer» E. | |
| 133. |
The number of water molecules present in a drop of water (volume 0.0018 mL) density =\[18m{{L}^{-1}}\] at room temperature is |
| A. | \[1.084\times {{10}^{18}}\] |
| B. | \[6.023\times {{10}^{19}}\] |
| C. | \[4.84\times {{10}^{17}}\] |
| D. | \[6.023\times {{10}^{23}}\] |
| Answer» C. \[4.84\times {{10}^{17}}\] | |
| 134. |
A crystalline solid [Kerala CET (Med.) 2003] |
| A. | Changes abruptly from solid to liquid when heated |
| B. | Has no definite melting point |
| C. | Undergoes deformation of its geometry easily |
| D. | Has an irregular 3-dimensional arrangements |
| E. | Softens slowly |
| Answer» B. Has no definite melting point | |
| 135. |
Liebermann's nitroso reaction is used for testing |
| A. | Primary amines |
| B. | Secondary amines |
| C. | Tertiary amines |
| D. | All the above |
| Answer» C. Tertiary amines | |
| 136. |
Electron addition will be easier in: |
| A. | O |
| B. | \[{{O}^{+}}\] |
| C. | \[{{O}^{2+}}\] |
| D. | \[{{O}^{2-}}\] |
| Answer» D. \[{{O}^{2-}}\] | |
| 137. |
The prefix zepto stands for [DPMT 2004] |
| A. | \[{{10}^{9}}\] |
| B. | \[{{10}^{-12}}\] |
| C. | \[{{10}^{-15}}\] |
| D. | \[{{10}^{-21}}\] |
| Answer» E. | |
| 138. |
Only two isomeric monochloro derivatives are possible for [Pb. PMT 2000] |
| A. | 2-methyl propane |
| B. | n-pentane |
| C. | Benzene |
| D. | 2, 4-dimethyl pentane |
| Answer» B. n-pentane | |
| 139. |
Lactic acid in which a methyl group, a hydroxyl group, a carboxylic acid group and a hydrogen atom are attached to a central carbon atom, shown optical isomerism due to the molecular geometry at the [Pb. PMT 2000] |
| A. | Central carbon atom |
| B. | Carbon atom of the methyl group |
| C. | Carbon atom of the carboxylic acid group |
| D. | Oxygen of the hydroxyl groups |
| Answer» B. Carbon atom of the methyl group | |
| 140. |
Which of the following transitions have minimum wavelength [DPMT 2005] |
| A. | \[{{n}_{4}}\to {{n}_{1}}\] |
| B. | \[{{n}_{2}}\to {{n}_{1}}\] |
| C. | \[{{n}_{4}}\to {{n}_{2}}\] |
| D. | \[{{n}_{3}}\to {{n}_{1}}\] |
| Answer» B. \[{{n}_{2}}\to {{n}_{1}}\] | |
| 141. |
When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together [AFMC 2001] |
| A. | Hydrogen bond formation |
| B. | Van der Waals forces |
| C. | Covalent attraction |
| D. | Ionic interaction |
| Answer» B. Van der Waals forces | |
| 142. |
What is formed when calcium carbide reacts with heavy water [Manipal PMT 2001; Pb. CET 2000] |
| A. | \[{{C}_{2}}{{D}_{2}}\] |
| B. | \[Ca{{D}_{2}}\] |
| C. | \[C{{a}_{2}}{{D}_{2}}O\] |
| D. | \[C{{D}_{2}}\] |
| Answer» B. \[Ca{{D}_{2}}\] | |
| 143. |
Animal charcoal is used in decolourising colour of liquids because it is a good [MHCET 2004] |
| A. | Adsorbate |
| B. | Adsorbent |
| C. | Oxidising agent |
| D. | Reducing agent |
| Answer» B. Adsorbent | |
| 144. |
A crystalline solid have [DCE 2001] |
| A. | Long range order |
| B. | Short range order |
| C. | Disordered arrangement |
| D. | None of these |
| Answer» B. Short range order | |
| 145. |
Which of the following elements is found in native state [RPET 1999] |
| A. | Al |
| B. | Au |
| C. | Cu |
| D. | Na |
| Answer» C. Cu | |
| 146. |
The basis of keeping the elements in the group of a periodic table is [RPET 1999] |
| A. | Ionisation potential |
| B. | Electronegativity |
| C. | Electron affinity |
| D. | Number of electrons in the valence shell |
| Answer» E. | |
| 147. |
What will be the difference between electromagnetic radiation shown in A and B respectively?(i) Velocity (ii) Wavelength(iii) Frequency (iv) Energy |
| A. | (ii) only |
| B. | (ii) and (iv) |
| C. | (ii), (iii) and (iv) |
| D. | (iv) only |
| Answer» D. (iv) only | |
| 148. |
Which of the following parameter is correct regarding adsorption of gases over solid? |
| A. | \[\Delta {{S}_{system}}>0\] |
| B. | \[\Delta {{S}_{surronunding}}>0\] |
| C. | \[\Delta G>0\] |
| D. | \[\Delta H>0\] |
| Answer» C. \[\Delta G>0\] | |
| 149. |
A dye absorbs a photon of wavelength \[\lambda \] and re-emits the same energy into two photons of wavelength \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] respectively. The wavelength \[\lambda \] is related with \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] as: |
| A. | \[\lambda =\frac{{{\lambda }_{1}}+{{\lambda }_{2}}}{{{\lambda }_{1}}{{\lambda }_{2}}}\] |
| B. | \[\lambda =\frac{{{\lambda }_{1}}{{\lambda }_{2}}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\] |
| C. | \[\lambda =\frac{{{\lambda }_{1}}^{2}{{\lambda }_{2}}^{2}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\] |
| D. | \[\lambda =\frac{{{\lambda }_{1}}{{\lambda }_{2}}}{{{({{\lambda }_{1}}+{{\lambda }_{2}})}^{2}}}\] |
| Answer» C. \[\lambda =\frac{{{\lambda }_{1}}^{2}{{\lambda }_{2}}^{2}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\] | |
| 150. |
Anhydrous \[AlC{{l}_{3}}\] is prepared from |
| A. | cone. \[HCl\] and Al metal |
| B. | aluminium and \[C{{l}_{\text{2}}}\] |
| C. | dry \[HCl\] gas + heated Al metal |
| D. | dil. \[HCl\] and Al metal |
| Answer» D. dil. \[HCl\] and Al metal | |