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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.
| 10151. |
What is the nature of the bond between B and O in \[{{({{C}_{2}}{{H}_{5}})}_{2}}OB{{H}_{3}}\] [Orissa JEE 2003] |
| A. | Covalent |
| B. | Co-ordinate covalent |
| C. | Ionic bond |
| D. | Banana shaped bond |
| Answer» C. Ionic bond | |
| 10152. |
Equivalent weight of a bivalent metal is 37.2. The molecular weight of its chloride is [MH CET 2003] |
| A. | 412.2 |
| B. | 216 |
| C. | 145.4 |
| D. | 108.2 |
| Answer» D. 108.2 | |
| 10153. |
What will happen if \[CC{{l}_{4}}\] is treated with \[AgN{{O}_{3}}\] [DPMT 1983] |
| A. | A white ppt. of \[AgCl\] will form |
| B. | \[N{{O}_{2}}\] will be evolved |
| C. | \[CC{{l}_{4}}\] will dissolve in \[AgN{{O}_{3}}\] |
| D. | Nothing will happen |
| Answer» E. | |
| 10154. |
Which of the following pair of the species has the same percentage of carbon [BHU 1999] |
| A. | \[C{{H}_{3}}-C{{H}_{2}}-\underset{\,\,C{{H}_{2}}C{{H}_{3}}\,\,\,\,\,}{\mathop{\underset{\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\overset{\overset{\,C{{H}_{3}}C{{H}_{2}}\,\,\,\,}{\mathop{\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{C\,\,\,\,\,\,\,\,-\,\,\,\,\,\,}}}\,}}\,\overset{\overset{C{{H}_{3}}}{\mathop{|\,\,\,\,\,\,}}\,\,\,\,\,\,\,}{\mathop{CH\,-\,}}\,C{{H}_{2}}-{{(C{{H}_{2}})}_{2}}-C{{H}_{3}}\] and \[{{C}_{2}}{{H}_{5}}OH\] |
| B. | \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\] and \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\] |
| C. | \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\] and \[{{C}_{12}}{{O}_{22}}{{O}_{11}}\] |
| D. | \[{{C}_{12}}{{O}_{22}}{{O}_{11}}\] and \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\] |
| Answer» E. | |
| 10155. |
Mark the steel in which carbon % is highest |
| A. | Mild steel |
| B. | Hard steel |
| C. | Alloy steel |
| D. | None of these |
| Answer» C. Alloy steel | |
| 10156. |
An organic compound has an empirical formula \[C{{H}_{2}}O\], its vapour density is 45. The molecular formula of the compounds is [DCE 2004] |
| A. | \[C{{H}_{2}}O\] |
| B. | \[{{C}_{2}}{{H}_{5}}O\] |
| C. | \[{{C}_{2}}{{H}_{2}}O\] |
| D. | \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\] |
| Answer» E. | |
| 10157. |
The study of organic compounds even at present is done separate from other compounds because [CPMT 1986] |
| A. | The formation of organic compounds is not based on chemical combination |
| B. | Organic compounds are covalent |
| C. | Catenation is the main characteristics |
| D. | It is the easiest method of study |
| Answer» D. It is the easiest method of study | |
| 10158. |
Acedic strength of Boron trihalide are in order of [Kerala CET 2005] |
| A. | \[B{{F}_{3}}<BC{{l}_{3}}<BB{{r}_{3}}<B{{I}_{3}}\] |
| B. | \[B{{I}_{3}}<BB{{r}_{3}}<BC{{l}_{3}}<B{{F}_{3}}\] |
| C. | \[BB{{r}_{3}}<BC{{l}_{3}}<B{{F}_{3}}<B{{I}_{3}}\] |
| D. | \[B{{F}_{3}}<B{{I}_{3}}<BC{{l}_{3}}<BB{{r}_{3}}\] |
| Answer» B. \[B{{I}_{3}}<BB{{r}_{3}}<BC{{l}_{3}}<B{{F}_{3}}\] | |
| 10159. |
An emulsion is a colloidal dispersion of [BCECE 2005] |
| A. | A liquid in a gas |
| B. | A liquid in a liquid |
| C. | A solid in a liquid |
| D. | A gas in a solid |
| Answer» C. A solid in a liquid | |
| 10160. |
Which of the following solutions boils at the highest temperature [AMU 2001] |
| A. | 0.1 M glucose |
| B. | 0.1 M NaCl |
| C. | 0.1 M \[BaC{{l}_{2}}\] |
| D. | 0.1 M Urea |
| Answer» C. 0.1 M \[BaC{{l}_{2}}\] | |
| 10161. |
Red lead is [CPMT 1972, 74, 94; MNR 1985; DPMT 1982, 2002; Bihar CEE 1995; MP PET 1995] |
| A. | \[P{{b}_{3}}{{O}_{4}}\] |
| B. | \[PbO\] |
| C. | \[Pb{{O}_{2}}\] |
| D. | \[P{{b}_{4}}{{O}_{3}}\] |
| Answer» B. \[PbO\] | |
| 10162. |
A photon of hard gamma radiation knocks a proton out of \[_{12}^{24}Mg\] nucleus to form [AIEEE 2005] |
| A. | The isotope of parent nucleus |
| B. | The isobar of parent nucleus |
| C. | The nuclide \[_{11}^{23}Na\] |
| D. | The isobar of \[_{11}^{23}Na\] |
| Answer» D. The isobar of \[_{11}^{23}Na\] | |
| 10163. |
Select the incorrect option about spontaneous exothermic reaction. |
| A. | \[\Delta {{S}_{surr}}=+ve\] |
| B. | \[\Delta {{S}_{Overall}}=+ve\] |
| C. | \[\Delta {{S}_{System}}may=-ve\] |
| D. | \[\Delta {{S}_{System}}=+ve\,\,\text{always}\] |
| Answer» E. | |
| 10164. |
The polymerization of ethylene to linear polyethylene is represented by the reaction \[nC{{H}_{2}}=C{{H}_{2}}\xrightarrow{\,}\,{{(-C{{H}_{2}}-C{{H}_{2}}-)}_{n}}\] when 'n' has a large integral value. Given that average enthalpies of bond dissociation for \[C=C\] and \[C-C\] at 298 K are + 590 and \[+331\,\,kJ\,\,mo{{l}^{-1}}\] respectively. Then the enthalpy of polymerization/mol of ethylene at298 K is |
| A. | - 132 kJ |
| B. | - 72 kJ |
| C. | + 80 kJ |
| D. | + 162 kJ |
| Answer» C. + 80 kJ | |
| 10165. |
Which of the following reactions corresponds to the definition of enthalphy of formation? |
| A. | C (diamond) \[+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] |
| B. | C (graphite) \[+{{O}_{2}}(l)\to C{{O}_{2}}(g)\] |
| C. | C (graphite) \[+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] |
| D. | \[C(g)+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] |
| Answer» D. \[C(g)+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] | |
| 10166. |
A 1 g sample of octane \[{{C}_{8}}{{H}_{18}}\] is burned in excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rises from 294 K to 300 K. If heat capacity of the calorimeter is 8 kJ/K, the enthalpy of combustion of octane is |
| A. | 5472 kJ/mol |
| B. | 48 kJ/mol |
| C. | 684 kJ/mol |
| D. | 4281 kJ/mol |
| Answer» B. 48 kJ/mol | |
| 10167. |
The tendency of a reaction to take place spontaneously is greatest when the reaction is |
| A. | Exothermic and randomness increases |
| B. | Endothermic & randomness increases |
| C. | Exothermic and randomness decreases |
| D. | Endothermic & randomness decreases |
| Answer» B. Endothermic & randomness increases | |
| 10168. |
Which of the following defines enthalpy of solution? |
| A. | \[{{H}_{2}}O(l)\xrightarrow[{}]{{}}{{H}^{+}}(aq)+O{{H}^{-}}(aq)\] |
| B. | \[N{{H}_{4}}Cl(s)\xrightarrow[{}]{{}}NH_{4}^{+}(aq)+C{{l}^{-}}(aq)\] |
| C. | \[CuS{{O}_{4}}\cdot 5{{H}_{2}}O(s)+{{H}_{2}}O\xrightarrow[{}]{{}}CuS{{O}_{4}}(aq)\] |
| D. | \[CuS{{O}_{4}}(s)+5{{H}_{2}}O\xrightarrow[{}]{{}}CuS{{O}_{4}}\cdot 5{{H}_{2}}O(s)\] |
| Answer» D. \[CuS{{O}_{4}}(s)+5{{H}_{2}}O\xrightarrow[{}]{{}}CuS{{O}_{4}}\cdot 5{{H}_{2}}O(s)\] | |
| 10169. |
If (i) \[\Delta H_{f}^{o}\] (benzene)\[=-358.5\,\,kJ\,\,mo{{l}^{-1}}\]. (ii) Heat of atomization of graphite\[=716.8\,\,kJ\,mo{{l}^{-1}}\]. (iii) Bond energy of \[C-H,\,\,C-C,\,\,C=C\] and \[H-H\] bonds are 490, 340, 620 and\[436.9\,\,kJ\,\,mo{{l}^{-1}}\] respectively. The resonance energy (in \[kJ\,\,mo{{l}^{-1}}\]) of \[{{C}_{6}}{{H}_{6}}\] using Kekule formula is |
| A. | -150 |
| B. | -50 |
| C. | -250 |
| D. | 150 |
| Answer» B. -50 | |
| 10170. |
Which of the following is not the extensive property? |
| A. | Gibbs free energy |
| B. | Enthalpy |
| C. | Entropy |
| D. | Viscosity |
| Answer» E. | |
| 10171. |
An ideal gas expands from an initial volume Pinto vacuum under isothermal conditions. For this process, |
| A. | \[\Delta U\ne 0,\,W=0\,and\,Q\ne 0\] |
| B. | \[\Delta U\ne 0,\,W\ne 0\,and\,Q\ne 0\] |
| C. | \[\Delta U\ne 0,\,W\ne 0\,and\,Q=0\] |
| D. | \[\Delta U=0,\,W=0\,and\,Q=0\] |
| Answer» E. | |
| 10172. |
An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If \[{{T}_{i}}\] is the initial temperature and\[{{T}_{f}}\]is the final temperature, which of following statements is correct? |
| A. | \[{{T}_{f}}\] and \[{{T}_{i}}\] or both reversible and irreversible processes |
| B. | \[{{({{T}_{f}})}_{irrev}}>{{({{T}_{i}})}_{rev}}\] |
| C. | \[{{T}_{f}}\] > \[{{T}_{i}}\] for irreversible process but \[{{T}_{f}}\] and \[{{T}_{i}}\] for irreversible process |
| D. | \[{{({{T}_{f}})}_{rev}}>{{({{T}_{i}})}_{irrev}}\] |
| Answer» C. \[{{T}_{f}}\] > \[{{T}_{i}}\] for irreversible process but \[{{T}_{f}}\] and \[{{T}_{i}}\] for irreversible process | |
| 10173. |
In an exothermic reaction \[\Delta H\] is [MP PMT 1995; CPMT 1999] |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | Both positive or negative |
| Answer» C. Zero | |
| 10174. |
The cooling in refrigerator is due to [KCET 2005] |
| A. | Reaction of the refrigerator gas |
| B. | Expansion of ice |
| C. | The expansion of the gas in the refrigerator |
| D. | The work of the compressor |
| Answer» D. The work of the compressor | |
| 10175. |
\[S+\frac{3}{2}{{O}_{2}}\to S{{O}_{3}}+2x\,kcal\] \[S{{O}_{2}}+\frac{1}{2}{{O}_{2}}\to S{{O}_{3}}+y\,kcal\] Find out the heat of formation of \[S{{O}_{2}}\] [AIIMS 1997; CBSE PMT 1999; KCET 1999] |
| A. | \[2x-y\] |
| B. | \[2x+y\] |
| C. | \[x+y\] |
| D. | \[2x/y\] |
| Answer» B. \[2x+y\] | |
| 10176. |
In which of the following reactions does the heat change represent the heat of formation of water [EAMCET 1991] |
| A. | \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l);\,\Delta H=-116\,kcal\] |
| B. | \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to {{H}_{2}}O(l);\,\Delta H=-58\,kcal\] |
| C. | \[{{H}^{+}}(aq.)+O{{H}^{-}}(aq.)\to 2{{H}_{2}}O(l);\,\Delta H=-13.7\,kcal\] |
| D. | \[{{C}_{2}}{{H}_{2}}(g)+2\frac{1}{2}{{O}_{2}}(g)\to 2C{{O}_{2}}(g)+{{H}_{2}}O(l)\]; \[\Delta H=-310\,kcal\] |
| Answer» C. \[{{H}^{+}}(aq.)+O{{H}^{-}}(aq.)\to 2{{H}_{2}}O(l);\,\Delta H=-13.7\,kcal\] | |
| 10177. |
2.1 g of Fe combines with S evolving 3.77 kJ. The heat of formation of FeS in kJ/mol is [AMU (Engg.) 1999] |
| A. | ? 1.79 |
| B. | ? 100.5 |
| C. | ? 3.77 |
| D. | None of these |
| Answer» C. ? 3.77 | |
| 10178. |
Which of the following endothermic processes are spontaneous [CBSE PMT 2001] |
| A. | Melting of ice |
| B. | Evaporation of water |
| C. | Heat of combustion |
| D. | Both A and B |
| Answer» E. | |
| 10179. |
The standard enthalpy of the decomposition of \[{{N}_{2}}{{O}_{4}}\] to \[N{{O}_{2}}\] is 58.04 kJ and standard entropy of this reaction is 176.7 J/K. The standard free energy change for this reaction at \[{{25}^{o}}C\] is [AIIMS 1999] |
| A. | 539 kJ |
| B. | ? 539 kJ |
| C. | ? 5.39 kJ |
| D. | 5.39 kJ |
| Answer» E. | |
| 10180. |
Highest entropy is in [BVP 2003] |
| A. | Hydrogen |
| B. | Water |
| C. | Graphite |
| D. | Mercury |
| Answer» B. Water | |
| 10181. |
The ability of a given substance to assume two or more crystalline structure is called [DCE 2004] |
| A. | Amorphism |
| B. | Isomorphism |
| C. | Polymorphism |
| D. | Isomerism |
| Answer» D. Isomerism | |
| 10182. |
Which of the following is an example of covalent crystal solid |
| A. | \[Si\] |
| B. | \[NaF\] |
| C. | \[Al\] |
| D. | \[Ar\] |
| Answer» B. \[NaF\] | |
| 10183. |
Crystalline solids are [Pb. PMT 1999] |
| A. | Glass |
| B. | Rubber |
| C. | Plastic |
| D. | Sugar |
| Answer» E. | |
| 10184. |
Among solids the highest melting point is established by [Kerala CET (Med.) 2002] |
| A. | Covalent solids |
| B. | Ionic solids |
| C. | Pseudo solids |
| D. | Molecular solids |
| Answer» C. Pseudo solids | |
| 10185. |
The three states of matter are solid, liquid and gas. Which of the following statement is/are true about them [AIIMS 1991] |
| A. | Gases and liquids have viscosity as a common property |
| B. | The molecules in all the three states possess random translational motion |
| C. | Gases cannot be converted into solids without passing through the liquid phase |
| D. | Solids and liquids have vapour pressure as a common property |
| Answer» B. The molecules in all the three states possess random translational motion | |
| 10186. |
In which of the following unit cells all sides and all angles are equal? Cubic (I), Tetragonal (II), Orthorhombic (III), Rhombohedra (IV) |
| A. | I and II |
| B. | I |
| C. | I and III |
| D. | I and IV |
| Answer» E. | |
| 10187. |
Which of the following order is correct regarding size of the voids. |
| A. | Octahedral < tetrahedral < square planar < trigonal |
| B. | trigonal < tetrahedral = square planar < octahedral |
| C. | trigonal < tetrahedral < square planar = octahedral |
| D. | tetrahedral < trigonal = square planar <octahedral |
| Answer» D. tetrahedral < trigonal = square planar <octahedral | |
| 10188. |
In fcc lattice, A, B, C, D atoms are arranged at corners, face centres, octahedral voids and tetrahedral voids respectively, then the body diagonal contains |
| A. | 2A, C, 2D |
| B. | 2A, 2B, 2C |
| C. | 2A, 2B, D |
| D. | 2A, 2D |
| Answer» B. 2A, 2B, 2C | |
| 10189. |
Lithium borohydride crystallizes in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are \[a=6.8\text{ }\overset{o}{\mathop{A}}\,,\,b=4.4\overset{o}{\mathop{A}}\,\] and \[c=7.2\overset{o}{\mathop{A.}}\,\] If the molar mass is 21.76, then the density of crystals is: |
| A. | \[0.6708\text{ }g\text{ }c{{m}^{-2}}\] |
| B. | \[1.6708\text{ }g\text{ }c{{m}^{-3}}\] |
| C. | \[2.6708\text{ }g\,\,c{{m}^{-3}}\] |
| D. | None of these. |
| Answer» B. \[1.6708\text{ }g\text{ }c{{m}^{-3}}\] | |
| 10190. |
Percent of octahedral voids vacant in a perfect crystal of ZnS is |
| A. | 0 |
| B. | 0.5 |
| C. | 1 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 10191. |
In hexagonal close packing of sphere in three dimensions, which of the following statements is correct. |
| A. | In one unit cell there are 12 octahedral voids and all are completely inside the unit cell. |
| B. | In one unit cell there are six octahedral voids and all are completely inside the unit cell. |
| C. | In one unit cell there are six octahedral void and of which three are completely inside the unit cell and other three are partially inside the unit cell. |
| D. | In one unit cell there are 12 tetrahedral voids, all are completely inside the unit cell. |
| Answer» C. In one unit cell there are six octahedral void and of which three are completely inside the unit cell and other three are partially inside the unit cell. | |
| 10192. |
Schottky defect in crystals is observed when |
| A. | unequal number of cations and anions are missing from the lattice. |
| B. | equal number of cations and anions are missing from the lattice. |
| C. | an ion leaves its normal site and occupies an interstitial site. |
| D. | density of the crystal is increased |
| Answer» C. an ion leaves its normal site and occupies an interstitial site. | |
| 10193. |
A crystal is made of particles A and B. A forms fcc packing and B occupies all the octahedral voids. If all the particles along the plane as shown in the figure are removed, then the formula of the crystal would be: |
| A. | \[AB\] |
| B. | \[{{A}_{5}}{{B}_{7}}\] |
| C. | \[{{A}_{7}}{{B}_{5}}\] |
| D. | none of these |
| Answer» B. \[{{A}_{5}}{{B}_{7}}\] | |
| 10194. |
The first three nearest neighbor distance for primitive cubic lattice are respectively (edge length of unit cell = a): |
| A. | \[a,\,\sqrt{2}a,\sqrt{3}a\] |
| B. | \[\sqrt{3}a,\,\sqrt{2}a,\,a\] |
| C. | \[a,\,\sqrt{2}a,2\,a\] |
| D. | \[a,\,\sqrt{3}a,2\,a\] |
| Answer» B. \[\sqrt{3}a,\,\sqrt{2}a,\,a\] | |
| 10195. |
A metal crystallizes into two cubic phases, face centred cubic (fee) and body centred cubic (bcc) whose unit cell lengths are 3.5 and \[3.0\,\overset{o}{\mathop{A}}\,\] respectively. Calculate the ratio of the densities of fee and bee. |
| A. | 1.67 |
| B. | 1.26 |
| C. | 6.23 |
| D. | 1.04 |
| Answer» C. 6.23 | |
| 10196. |
How many unit cells are present in a cube-shaped ideal crystal of \[NaCl\] of mass 1.00g? [Atomic masses: Na = 23, Cl = 35.5] |
| A. | \[2.57\times {{10}^{21}}\] unit cells |
| B. | \[5.14\times {{10}^{21}}\] unit cells |
| C. | \[1.28\times {{10}^{21}}\] unit cells |
| D. | \[1.71\times {{10}^{21}}\] unit cells |
| Answer» B. \[5.14\times {{10}^{21}}\] unit cells | |
| 10197. |
Iron crystallizes in several-modifications. At about \[910{}^\circ C\] 'bcc' form (called \[\alpha -\]form) undergoes transitions, to \[\gamma -\]form with 'fcc' lattice. Assuming that the distance between the nearest neighbors is the same in the two forms at the transition temperature, calculate the ratio of the density of \[\gamma -\]ron to that of \[\alpha -\]iron at the transition temperature. |
| A. | 0.0887 |
| B. | 1.0887 |
| C. | 1.546 |
| D. | 1.544 |
| Answer» C. 1.546 | |
| 10198. |
\[ZnO\] is white when cold and yellow when heated. It is due to the development of |
| A. | Frenkel defect |
| B. | Schottky defect |
| C. | Metal excess defect |
| D. | Metal deficiency defect |
| Answer» D. Metal deficiency defect | |
| 10199. |
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because |
| A. | all the domains get oriented in the direction of magnetic field |
| B. | all the domains get oriented in the direction opposite to the direction of magnetic field |
| C. | domains get oriented randomly |
| D. | domains are not affected by magnetic field |
| Answer» B. all the domains get oriented in the direction opposite to the direction of magnetic field | |
| 10200. |
In normal spinel structures \[MgA{{l}_{2}}{{O}_{4}},\] the percentage of tetrahedral void occupied is |
| A. | 0.125 |
| B. | 0.25 |
| C. | 0.5 |
| D. | None of these |
| Answer» B. 0.25 | |