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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.
| 6751. |
In the fluorite structure, the coordination number of \[C{{a}^{2+}}\] ion is |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 3 |
| Answer» D. 3 | |
| 6752. |
Which of the following contains rock salt structure |
| A. | \[Sr{{F}_{2}}\] |
| B. | \[MgO\] |
| C. | \[A{{l}_{2}}{{O}_{3}}\] |
| D. | All |
| Answer» C. \[A{{l}_{2}}{{O}_{3}}\] | |
| 6753. |
An example of fluorite structure is |
| A. | \[NaF\] |
| B. | \[Sr{{F}_{2}}\] |
| C. | \[AlC{{l}_{3}}\] |
| D. | \[Si{{F}_{4}}\] |
| Answer» C. \[AlC{{l}_{3}}\] | |
| 6754. |
In which of the following crystals alternate tetrahedral voids are occupied? [IIT 2005] |
| A. | NaCl |
| B. | ZnS |
| C. | CaF2 |
| D. | Na2O |
| Answer» C. CaF2 | |
| 6755. |
Hexagonal close packed arrangement of ions is described as [MP PMT 1994] |
| A. | ABC ABA |
| B. | ABC ABC |
| C. | ABABA |
| D. | ABBAB |
| Answer» D. ABBAB | |
| 6756. |
The intermetallic compound \[LiAg\] crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is [CBSE PMT 1997] |
| A. | Simple cube |
| B. | Body-centred cube |
| C. | Face-centred cube |
| D. | None of these |
| Answer» C. Face-centred cube | |
| 6757. |
The number of octahedral sites per sphere in a fcc structure is [MP PMT 2000, 01] |
| A. | 8 |
| B. | 4 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 6758. |
If 'Z' is the number of atoms in the unit cell that represents the closest packing sequence \[---A\ B\ C\ A\ B\ C--\ -,\] the number of tetrahedral voids in the unit cell is equal to [AIIMS 2005] |
| A. | Z |
| B. | 2 Z |
| C. | Z/2 |
| D. | Z/4 |
| Answer» C. Z/2 | |
| 6759. |
In the Fischer-Tropsch synthesis of petrol..... and ..... are used as the raw materials [KCET 1998] |
| A. | \[{{H}_{2}};CO\] |
| B. | \[C{{H}_{4}};{{H}_{2}}\] |
| C. | \[C{{H}_{4}};C{{H}_{3}}OH\] |
| D. | \[C{{H}_{3}}OH;CO\] |
| Answer» B. \[C{{H}_{4}};{{H}_{2}}\] | |
| 6760. |
The energy of an electron in the first Bohr orbit of \[H\]atom is \[-13.6eV\]. The possible energy value(s) of the excited state(s) for electrons in Bohr orbits to hydrogen is(are) [IIT 1998; Orissa JEE 2005] |
| A. | \[-3.4eV\] |
| B. | \[-4.2eV\] |
| C. | \[-6.8eV\] |
| D. | \[+6.8eV\] |
| Answer» B. \[-4.2eV\] | |
| 6761. |
If \[{{10}^{21}}\]molecules are removed from 200mg of \[C{{O}_{2}}\], then the number of moles of \[C{{O}_{2}}\]left are [IIT 1983] |
| A. | \[2.85\times {{10}^{-3}}\] |
| B. | \[28.8\times {{10}^{-3}}\] |
| C. | \[0.288\times {{10}^{-3}}\] |
| D. | \[1.68\times {{10}^{-2}}\] |
| Answer» B. \[28.8\times {{10}^{-3}}\] | |
| 6762. |
One mole of a compound AB reacts with one mole of a compound CD according to the equation AB + CD ⇌ AD + CB. When equilibrium had been established it was found that \[\frac{3}{4}\]mole each of reactant AB and CD had been converted to AD and CB. There is no change in volume. The equilibrium constant for the reaction is [Kerala (Med.) 2003] |
| A. | \[\frac{9}{16}\] |
| B. | \[\frac{1}{9}\] |
| C. | \[\frac{16}{9}\] |
| D. | 9 |
| Answer» E. | |
| 6763. |
The oxidation number of sulphur in \[{{H}_{2}}{{S}_{2}}{{O}_{7}}\] and iron in \[{{K}_{4}}Fe{{(CN)}_{6}}\] is respectively [AIIMS 2000] |
| A. | + 6 and + 2 |
| B. | + 2 and + 2 |
| C. | + 8 and + 2 |
| D. | + 6 and + 4 |
| Answer» B. + 2 and + 2 | |
| 6764. |
When ethyl alcohol is heated with red phosphorus and HI, then which of the following is formed [Kurukshetra CEE 1998] |
| A. | \[{{C}_{2}}{{H}_{6}}\] |
| B. | \[C{{H}_{4}}\] |
| C. | \[{{C}_{3}}{{H}_{8}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» B. \[C{{H}_{4}}\] | |
| 6765. |
In a mole of water vapour at STP, the volume actually occupied or taken by the molecules (i.e., Avogadro?s No. \[\times \] Volume of one molecule) is [Kerala EEE 2000] |
| A. | Zero |
| B. | Less than 1% of 22.4 litres |
| C. | About 10% of the volume of container |
| D. | 1% to 2% of 22.4 litres |
| E. | Between 2% to 5% of 22.4 litres |
| Answer» C. About 10% of the volume of container | |
| 6766. |
The correct order of dipole moment is [Roorkee 1999] |
| A. | \[C{{H}_{4}}<N{{F}_{3}}<N{{H}_{3}}<{{H}_{2}}O\] |
| B. | \[N{{F}_{3}}<C{{H}_{4}}<N{{H}_{3}}<{{H}_{2}}O\] |
| C. | \[N{{H}_{3}}<N{{F}_{3}}<C{{H}_{4}}<{{H}_{2}}O\] |
| D. | \[{{H}_{2}}O<N{{H}_{3}}<N{{F}_{3}}<C{{H}_{4}}\] |
| Answer» B. \[N{{F}_{3}}<C{{H}_{4}}<N{{H}_{3}}<{{H}_{2}}O\] | |
| 6767. |
The compressibility factor of a gas is less than 1 at STP. Its molar volume \[{{V}_{m}}\] will be [MP PET 2004] |
| A. | \[{{V}_{m}}>\] 22.42 |
| B. | \[{{V}_{m}}<\]22.42 |
| C. | \[{{V}_{m}}=\]22.42 |
| D. | None |
| Answer» C. \[{{V}_{m}}=\]22.42 | |
| 6768. |
The partial pressures of \[C{{H}_{3}}OH,\,CO\] and \[{{H}_{2}}\] in the equilibrium mixture for the reaction \[CO+2{{H}_{2}}\]⇌\[CH{}_{3}OH\] at 427°C are 2.0, 1.0 and 0.1 atm respectively. The value of \[{{K}_{P}}\] for the decomposition of \[C{{H}_{3}}OH\] to CO and \[{{H}_{2}}\] is [Roorkee 1999] |
| A. | \[1\times {{10}^{2}}\]atm |
| B. | \[2\times {{10}^{2}}at{{m}^{-1}}\] |
| C. | \[50\,\,at{{m}^{2}}\] |
| D. | \[5\times {{10}^{-3}}at{{m}^{2}}\] |
| Answer» E. | |
| 6769. |
Which one is a Lewis acid [RPMT 1997] |
| A. | \[Cl{{F}_{3}}\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[N{{H}_{3}}\] |
| D. | None of these |
| Answer» B. \[{{H}_{2}}O\] | |
| 6770. |
In the reaction \[Zn+2{{H}^{+}}+2C{{l}^{-}}\to Z{{n}^{2+}}+2C{{l}^{-}}+{{H}_{2}}\], the spectator ion is [AIIMS 2001] |
| A. | \[C{{l}^{-}}\] |
| B. | \[Z{{n}^{2+}}\] |
| C. | \[{{H}^{+}}\] |
| D. | All of these |
| Answer» B. \[Z{{n}^{2+}}\] | |
| 6771. |
What is the pH of a 1M \[C{{H}_{3}}COOH\]a solution \[{{K}_{a}}\] of acetic acid \[=1.8\times {{10}^{-5}}.\] \[K={{10}^{-14}}mo{{l}^{2}}litr{{e}^{-2}}\] [DPMT 2002] |
| A. | 9.4 |
| B. | 4.8 |
| C. | 3.6 |
| D. | 2.4 |
| Answer» B. 4.8 | |
| 6772. |
In the given reaction, the oxide of sodium is ?.\[\left[ \begin{matrix} 4Na+{{O}_{2}}\to 2N{{a}_{2}}O \\ N{{a}_{2}}O+{{H}_{2}}O\to 2NaOH \\ \end{matrix} \right]\] [Orissa JEE 2002] |
| A. | Acidic |
| B. | Basic |
| C. | Amphoteric |
| D. | Neutral |
| Answer» C. Amphoteric | |
| 6773. |
A base dissolved, in water, yields a solution with a hydroxyl ion concentration of \[0.05\,mol\,litr{{e}^{-1}}\]. The solution is [CBSE PMT 2000] |
| A. | Basic |
| B. | Acid |
| C. | Neutral |
| D. | Either B or C |
| Answer» B. Acid | |
| 6774. |
The correct order of increasing \[[{{H}_{3}}{{O}^{+}}]\] in the following aqueous solutions is [UPSEAT 2000] |
| A. | 0.01 M H2S <0.01 M H2SO4 < 0.01 M NaCl < 0.01 \[M\,NaN{{O}_{2}}\] |
| B. | 0.01 M NaCl <0.01 M NaNO2 < 0.01 M H2S < 0.01 M H2SO4 |
| C. | 0.01 M NaNO2 <0.01 M NaCl < 0.01 M H2S< 0.01 M H2SO4 |
| D. | 0.01 M H2S < 0.01 M NaNO2 < 0.01 M NaCl < 0.01 M H2SO4 |
| Answer» D. 0.01 M H2S < 0.01 M NaNO2 < 0.01 M NaCl < 0.01 M H2SO4 | |
| 6775. |
Increasing order of acidic character would be [RPMT 1999] |
| A. | \[C{{H}_{3}}COOH<{{H}_{2}}S{{O}_{4}}<{{H}_{2}}C{{O}_{3}}\] |
| B. | \[C{{H}_{3}}COOH<{{H}_{2}}C{{O}_{3}}<{{H}_{2}}S{{O}_{4}}\] |
| C. | \[{{H}_{2}}C{{O}_{3}}<C{{H}_{3}}COOH<{{H}_{2}}S{{O}_{4}}\] |
| D. | \[{{H}_{2}}S{{O}_{4}}<{{H}_{2}}C{{O}_{3}}<C{{H}_{3}}COOH\] |
| Answer» D. \[{{H}_{2}}S{{O}_{4}}<{{H}_{2}}C{{O}_{3}}<C{{H}_{3}}COOH\] | |
| 6776. |
A 0.1N solution of an acid at room temperature has a degree of ionisation 0.1. The concentration of \[O{{H}^{-}}\] would be [MH CET 1999] |
| A. | \[{{10}^{-12}}M\] |
| B. | \[{{10}^{-11}}M\] |
| C. | \[{{10}^{-9}}M\] |
| D. | \[{{10}^{-2}}M\] |
| Answer» B. \[{{10}^{-11}}M\] | |
| 6777. |
The Bronsted acids in the reversible reaction are \[HCO_{3}^{-}(aq.)+O{{H}^{-}}(aq.)\,\]⇄\[CO_{3}^{2-}(aq.)+{{H}_{2}}O\] [DPMT 2002] |
| A. | \[O{{H}^{-}}\] and \[CO_{3}^{2-}\] |
| B. | \[O{{H}^{-}}\] and \[{{H}_{2}}O\] |
| C. | \[HCO_{3}^{-}\] and \[{{H}_{2}}O\] |
| D. | \[HCO_{3}^{-}\] and \[CO_{3}^{2-}\] |
| Answer» D. \[HCO_{3}^{-}\] and \[CO_{3}^{2-}\] | |
| 6778. |
If \[50\,ml\] of \[0.2\,M\,KOH\] is added to \[40\,ml\] of \[0.5\,M\,HCOOH,\] the \[pH\] of the resulting solution is \[({{K}_{a}}=1.8\times {{10}^{-4}})\] [MH CET 2000] |
| A. | 3.4 |
| B. | 7.5 |
| C. | 5.6 |
| D. | 3.75 |
| Answer» B. 7.5 | |
| 6779. |
Calcium cyanamide on treatment with steam produce [Pb. PMT 2004] |
| A. | \[CaC{{O}_{3}}+N{{H}_{ 3}}\] |
| B. | \[CaHC{{O}_{3}}+N{{H}_{3}}\] |
| C. | \[CaO+N{{H}_{3}}\] |
| D. | \[Ca{{(OH)}_{2}}+N{{H}_{3}}\] |
| Answer» B. \[CaHC{{O}_{3}}+N{{H}_{3}}\] | |
| 6780. |
pH of 0.1 M solution of a weak acid (HA) is 4.50. It is neutralised with \[NaOH\] solution to decrease the acid content to half pH of the resulting solution [JIPMER 2002] |
| A. | 4.50 |
| B. | 8.00 |
| C. | 7.00 |
| D. | 10.00 |
| Answer» C. 7.00 | |
| 6781. |
Fusion mixture is [CPMT 2002] |
| A. | \[N{{a}_{2}}C{{O}_{3}}+{{K}_{2}}C{{O}_{3}}\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}\]\[+NaHC{{O}_{3}}\] |
| C. | \[N{{a}_{2}}C{{O}_{3}}+NaOH\] |
| D. | \[N{{a}_{2}}C{{O}_{3}}+{{K}_{2}}S{{O}_{4}}\] |
| Answer» B. \[N{{a}_{2}}C{{O}_{3}}\]\[+NaHC{{O}_{3}}\] | |
| 6782. |
Which transition metal reduces steam to evolve hydrogen [MP PMT 2003; DCE 2002] |
| A. | Mg |
| B. | Fe |
| C. | Sc |
| D. | Pt |
| Answer» C. Sc | |
| 6783. |
Camphor is often used in molecular mass determination because [CBSE PMT 2004] |
| A. | It is volatile |
| B. | It is solvent for organic substances |
| C. | It is readily available |
| D. | It has a very high cryoscopic constant |
| Answer» B. It is solvent for organic substances | |
| 6784. |
Condition for maximum yield of \[{{C}_{2}}{{H}_{5}}Cl\] is [IIT-JEE 1986] |
| A. | \[{{C}_{2}}{{H}_{6}}\] (excess) \[+C{{l}_{2}}\xrightarrow{UV\text{ Light}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] + \[C{{l}_{2}}\underset{\text{ Room}\,\text{temp}\text{.}}{\mathop{\xrightarrow{\text{Dark}}}}\,\] |
| C. | \[{{C}_{2}}{{H}_{6}}+C{{l}_{2}}\text{ (excess) }\xrightarrow{UV\text{ Light}}\] |
| D. | \[{{C}_{2}}{{H}_{6}}+C{{l}_{2}}\xrightarrow{UV\text{ Light}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{6}}\] + \[C{{l}_{2}}\underset{\text{ Room}\,\text{temp}\text{.}}{\mathop{\xrightarrow{\text{Dark}}}}\,\] | |
| 6785. |
In a Bohr's model of atom when an electron jumps from \[n=1\] to \[n=3\], how much energy will be emitted or absorbed [CBSE PMT 1996] |
| A. | \[2.15\times {{10}^{-11}}erg\] |
| B. | \[0.1911\times {{10}^{-10}}erg\] |
| C. | \[2.389\times {{10}^{-12}}erg\] |
| D. | \[0.239\times {{10}^{-10}}erg\] |
| Answer» C. \[2.389\times {{10}^{-12}}erg\] | |
| 6786. |
Which of the following contains maximum number of atoms [JIPMER 2000] |
| A. | \[6.023\times {{10}^{21}}\]molecules of \[C{{O}_{2}}\] |
| B. | 22.4 L of \[C{{O}_{2}}\]at STP |
| C. | 0.44 g of \[C{{O}_{2}}\] |
| D. | None of these |
| Answer» C. 0.44 g of \[C{{O}_{2}}\] | |
| 6787. |
Arrange the following compounds in order of increasing dipole moment. (I) Toluene (II) \[m-\]dichlorobenzene (III) \[o-\]dichlorobenzene (IV) \[p-\]dichlorobenzene [IIT 1996] |
| A. | \[I<IV<II<III\] |
| B. | \[IV<I<II<III\] |
| C. | \[IV<I<III<II\] |
| D. | \[IV<II<I<III\] |
| Answer» C. \[IV<I<III<II\] | |
| 6788. |
The compressibility factor for an ideal gas is [MP PET 2004] |
| A. | 1.5 |
| B. | 1.0 |
| C. | 2.0 |
| D. | \[\infty \] |
| Answer» C. 2.0 | |
| 6789. |
Total number of moles for the reaction \[2HI\,\,\]⇄ \[{{H}_{2}}+{{I}_{2}}.\] if \[\alpha \] is degree of dissociation is [CBSE PMT 1996] |
| A. | 2 |
| B. | \[2-\alpha \] |
| C. | 1 |
| D. | \[1-\alpha \] |
| Answer» D. \[1-\alpha \] | |
| 6790. |
\[{{M}^{+3}}\] ion loses \[3{{e}^{-}}\]. Its oxidation number will be [CPMT 2002] |
| A. | 0 |
| B. | + 3 |
| C. | + 6 |
| D. | ? 3 |
| Answer» D. ? 3 | |
| 6791. |
One mole of magnesium nitride on the reaction with an excess of water gives [AIEEE 2004] |
| A. | Two moles of ammonia |
| B. | One mole of nitric acid |
| C. | One mole of ammonia |
| D. | Two moles of nitric acid |
| Answer» B. One mole of nitric acid | |
| 6792. |
The number of moles of hydroxide \[(O{{H}^{-}})\] ion in 0.3 litre of 0.005 M solution of \[Ba{{(OH)}_{2}}\] is [JIPMER 2001] |
| A. | 0.0050 |
| B. | 0.0030 |
| C. | 0.0015 |
| D. | 0.0075 |
| Answer» C. 0.0015 | |
| 6793. |
Calculate the \[{{H}^{+}}\] ion concentration in a \[1.00\,\,(M)\] \[\,HCN\,\]litre solution \[({{K}_{a}}=4\times {{10}^{-10}})\] [Bihar CEE 1995] |
| A. | \[4\times {{10}^{-14}}\,mole/litre\] |
| B. | \[2\times {{10}^{-5}}\,mole/litre\] |
| C. | \[2.5\times {{10}^{-5}}\,mole/litre\] |
| D. | None of these |
| Answer» C. \[2.5\times {{10}^{-5}}\,mole/litre\] | |
| 6794. |
pH of a solution produced when an aqueous solution of \[pH\] 6 is mixed with an equal volume of an aqueous solution of \[pH\] 3 is about [KCET 2001] |
| A. | 3.3 |
| B. | 4.3 |
| C. | 4.0 |
| D. | 4.5 |
| Answer» B. 4.3 | |
| 6795. |
The microcosmic salt is [Pb.CET 2004; Pb. PMT 2004] |
| A. | \[Na(N{{H}_{4}}){{H}_{2}}O\] |
| B. | \[K(N{{H}_{4}})HP{{O}_{3}}2{{H}_{2}}O\] |
| C. | \[Na(N{{H}_{4}})HP{{O}_{4}}4{{H}_{2}}O)\] |
| D. | \[Na(N{{H}_{3}})HP{{O}_{4}}4{{H}_{2}}O\] |
| Answer» D. \[Na(N{{H}_{3}})HP{{O}_{4}}4{{H}_{2}}O\] | |
| 6796. |
Calculate the amount of \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] in grams which must be added to 500 ml of \[0.200\,M\,N{{H}_{3}}\] to yield a solution with \[pH=9.35\] \[({{K}_{b}}\] for \[N{{H}_{3}}=1.78\times {{10}^{-5}})\] [UPSEAT 2001] |
| A. | 10.56 gm |
| B. | 15 gm |
| C. | 12.74 gm |
| D. | 16.25 gm |
| Answer» B. 15 gm | |
| 6797. |
Ozone with dry iodine give [Pb. CET 2003] |
| A. | \[{{I}_{4}}{{O}_{4}}\] |
| B. | \[{{I}_{2}}{{O}_{3}}\] |
| C. | \[I{{O}_{2}}\] |
| D. | \[{{I}_{2}}{{O}_{4}}\] |
| Answer» B. \[{{I}_{2}}{{O}_{3}}\] | |
| 6798. |
The hydrogen ion concentration of a \[0.006\,\,M\] benzoic acid solution is \[({{K}_{a}}=6\times {{10}^{-5}})\] [MP PET 1994] |
| A. | \[0.6\times {{10}^{-4}}\] |
| B. | \[6\times {{10}^{-4}}\] |
| C. | \[6\times {{10}^{-5}}\] |
| D. | \[3.6\times {{10}^{-4}}\] |
| Answer» C. \[6\times {{10}^{-5}}\] | |
| 6799. |
Which of the following product is formed when \[Si{{F}_{4}}\] reacts with water [Pb. CET 2003] |
| A. | \[Si{{F}_{3}}\] |
| B. | \[{{H}_{4}}Si{{O}_{4}}\] |
| C. | \[{{H}_{2}}S{{O}_{4}}\] |
| D. | \[{{H}_{2}}Si{{F}_{4}}\] |
| Answer» C. \[{{H}_{2}}S{{O}_{4}}\] | |
| 6800. |
Which one of the following is not a buffer solution [AIIMS 2003] |
| A. | \[0.8\,M\,{{H}_{2}}S+0.8\,M\,KHS\] |
| B. | \[2\,M\,{{C}_{6}}{{H}_{5}}N{{H}_{2}}+2M\,{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{N}}\,{{H}_{3}}\,Br\] |
| C. | \[3\,M\,{{H}_{2}}C{{O}_{3}}+3\,M\,KHC{{O}_{3}}\] |
| D. | \[0.05\,M\,KCl{{O}_{4}}+0.05\,M\,HCl{{O}_{4}}\] |
| Answer» E. | |