MCQOPTIONS
Saved Bookmarks
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.
| 551. |
Arrange the following in increasing order of \[pH\,\,KN{{O}_{3}}(aq),\,C{{H}_{3}}COON(aq),\]\[N{{H}_{4}}Cl(aq),\,{{C}_{6}}{{H}_{5}}COON{{H}_{4}}(aq)\] |
| A. | \[C{{H}_{3}}COONa<{{C}_{6}}{{H}_{5}}COON{{H}_{4}}\]\[<N{{H}_{4}}Cl<KN{{O}_{3}}\] |
| B. | \[KN{{O}_{3}}<N{{H}_{4}}C<C{{H}_{3}}COONa\]\[<{{C}_{6}}{{H}_{5}}COONa\] |
| C. | \[N{{H}_{4}}Cl<KN{{O}_{3}}<C{{H}_{3}}COONa\]\[<{{C}_{6}}{{H}_{5}}COON{{H}_{4}}\] |
| D. | \[N{{H}_{4}}Cl<KN{{O}_{3}}<{{C}_{6}}{{H}_{5}}COON{{H}_{4}}\]\[<C{{H}_{3}}COONa\] |
| Answer» E. | |
| 552. |
The number of possible alcoholic isomers for \[{{C}_{4}}{{H}_{10}}O\] are [DPMT 1984; MNR 1986] |
| A. | 4 |
| B. | 2 |
| C. | 3 |
| D. | 5 |
| Answer» B. 2 | |
| 553. |
At \[30{}^\circ C\] the solubility of \[A{{g}_{2}}C{{O}_{3}}\] \[({{K}_{SP}}=8\times {{10}^{-12}})\] would be greatest in one litre of: |
| A. | \[0.05M\,\,N{{a}_{2}}C{{O}_{3}}\] |
| B. | \[0.05M\,AgN{{O}_{3}}\] |
| C. | Pure water |
| D. | \[0.05M\,{{K}_{2}}C{{O}_{3}}\] |
| Answer» D. \[0.05M\,{{K}_{2}}C{{O}_{3}}\] | |
| 554. |
A mixture of weak acid is \[0.1\text{ }M\] in \[HCOOH\] \[({{K}_{a}}=1.8\times {{10}^{-4}})\] and \[0.1\text{ }M\] in \[HOCN\,\,({{K}_{a}}=3.1\times {{10}^{-4}})\] Hence, \[[{{H}_{3}}{{O}^{\oplus }}]\] is |
| A. | \[7.0\times {{10}^{-3}}M\] |
| B. | \[4.1\times {{10}^{-4}}M\] |
| C. | \[0.20M\] |
| D. | \[4.1\times {{10}^{-3}}M\] |
| Answer» B. \[4.1\times {{10}^{-4}}M\] | |
| 555. |
The double helical structure of DNA was proposed by [KCET 1998] |
| A. | Watson and Crick |
| B. | Meicher |
| C. | Emil Fischer |
| D. | Khorana |
| Answer» B. Meicher | |
| 556. |
The solubility of \[AgCl\] in water at \[25{}^\circ C\] is \[1.79\times {{10}^{-3}}g/L\]. The \[{{K}_{sp}}\] of \[AgCl\] at \[25{}^\circ C\] is |
| A. | \[1.68\times {{10}^{-12}}\] |
| B. | \[1.55\times {{10}^{-10}}\] |
| C. | \[12.4\times {{10}^{-8}}\] |
| D. | \[1.73\times {{10}^{-14}}\] |
| Answer» C. \[12.4\times {{10}^{-8}}\] | |
| 557. |
If the de-Broglie wavelength of a particle mass m is 100 times its velocity, then its value in terms of its mass (m) and Planck's constant (h) is |
| A. | \[\frac{1}{10}\sqrt{\frac{m}{h}}\] |
| B. | \[10\sqrt{\frac{h}{m}}\] |
| C. | \[\frac{1}{10}\sqrt{\frac{h}{m}}\] |
| D. | \[10\sqrt{\frac{m}{h}}\] |
| Answer» C. \[\frac{1}{10}\sqrt{\frac{h}{m}}\] | |
| 558. |
Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be [DPMT 1984] |
| A. | 26.89 |
| B. | 8.9 |
| C. | 17.8 |
| D. | 26.7 |
| Answer» E. | |
| 559. |
A metallic element has a cubic lattice. Each edge of the unit cell is \[2{{A}^{0}}\]. The density of the metal is \[2\text{ }g\text{ }c{{m}^{-3}}\]. The unit cells in 200 g of the metal are |
| A. | \[1\times {{10}^{25}}\] |
| B. | \[1\times {{10}^{24}}\] |
| C. | \[1\times {{10}^{22}}\] |
| D. | \[1\times {{10}^{20}}\] |
| Answer» B. \[1\times {{10}^{24}}\] | |
| 560. |
Which of following is an example of ionic crystalline solid? |
| A. | Diamond |
| B. | LiF |
| C. | Li |
| D. | Silicon |
| Answer» C. Li | |
| 561. |
Which of the following statements about amorphous solids |
| A. | They melt over a range of temperature |
| B. | They are isotropic |
| C. | There is no orderly arrangement of particles |
| D. | They are rigid and incompressible |
| Answer» C. There is no orderly arrangement of particles | |
| 562. |
The impure 6 g of NaCl is dissolved in water and then treated with excess of silver nitrate solution. The mass of precipitate of silver chloride is found to be 14 g. The % purity of NaCl solution would be: |
| A. | 95% |
| B. | 0.85 |
| C. | 75% |
| D. | 0.65 |
| Answer» B. 0.85 | |
| 563. |
A black sulphide is formed by the action of \[{{H}_{2}}S\] on [IIT 1978] |
| A. | Cupric chloride |
| B. | Cadmium chloride |
| C. | Zinc chloride |
| D. | Sodium chloride |
| Answer» B. Cadmium chloride | |
| 564. |
Different colloidal particles of gold having different colours, obtained from different methods due to [MP PET 1989; UPSEAT 2001, 02; EAMCET 2003] |
| A. | Variable valency of gold |
| B. | Different concentration of gold particles |
| C. | Different types of impurities |
| D. | Different radius of colloidal particles |
| Answer» E. | |
| 565. |
The acid which has a peroxy linkage is |
| A. | Sulphurous acid |
| B. | Pyrosulphuric acid |
| C. | Dithionic acid |
| D. | Caro's acid |
| Answer» E. | |
| 566. |
In graphite, carbon atoms are joined together due to [AFMC 2002] |
| A. | Ionic bonding |
| B. | Vander Waal?s forces |
| C. | Metallic bonding |
| D. | Covalent bonding |
| Answer» E. | |
| 567. |
\[Sb{{F}_{5}}\] reacts with \[Xe{{F}_{4}}\] to form an adduct. The shapes of cation and anion in the adduct are respectively: |
| A. | square planar, trigonal bipyramidal |
| B. | T-shaped, octahedral |
| C. | square pyramidal, octahedral |
| D. | square planar, octahedral |
| Answer» C. square pyramidal, octahedral | |
| 568. |
Nitroethane can exhibit one of the following kind of isomerism [DCE 2004] |
| A. | Metamerism |
| B. | Optical activity |
| C. | Tautomerism |
| D. | Position isomerism |
| Answer» D. Position isomerism | |
| 569. |
Which is not a property of solids [MP PET 1995] |
| A. | Solids are always crystalline in nature |
| B. | Solids have high density and low compressibility |
| C. | The diffusion of solids is very slow |
| D. | Solids have definite volume |
| Answer» B. Solids have high density and low compressibility | |
| 570. |
Glycerol has strong intermolecular bonding therefore it is [RPET 2000] |
| A. | Sweet |
| B. | Reactive |
| C. | Explosive |
| D. | Viscous |
| Answer» E. | |
| 571. |
\[5N\] \[{{H}_{2}}S{{O}_{4}}\] was diluted from 1 litre to 10 litres. Normality of the solution obtained is |
| A. | 10 N |
| B. | 5 N |
| C. | 1 N |
| D. | 0.5 N |
| Answer» E. | |
| 572. |
When the following redox reaction is balanced, coefficient of \[{{H}^{+}}\] would be: \[M{{n}^{2+}}+BiO_{3}^{-}+{{H}^{+}}\to B{{i}^{3+}}+MnO_{4}^{-}+{{H}_{2}}O\] |
| A. | 3 |
| B. | 4 |
| C. | 7 |
| D. | 14 |
| Answer» E. | |
| 573. |
Consider the redox reaction : \[2S{{O}_{2}}O_{3}^{2-}+{{I}_{2}}\to {{S}_{4}}O_{6}^{2-}+2{{I}^{-}}\] |
| A. | \[2S{{O}_{2}}O_{3}^{2-}\] gets oxidised to \[S{{O}_{4}}O_{6}^{2-}\] |
| B. | \[S{{O}_{2}}O_{3}^{2-}\] gets reduced to \[{{S}_{4}}O_{6}^{2-}\] |
| C. | \[{{I}_{2}}\] gets reduced to \[{{I}^{-}}\] |
| D. | \[{{I}_{2}}\] gets oxidised to \[{{I}^{-}}\] |
| Answer» E. | |
| 574. |
Which of the following are redox reactions? |
| A. | \[\frac{1}{2}{{H}_{2}}+\frac{1}{2}{{I}_{2}}+HI\] |
| B. | \[PC{{l}_{5}}\to PC{{l}_{3}}+C{{l}_{2}}\] |
| C. | \[2CuS{{O}_{4}}+4KI\to C{{u}_{2}}{{I}_{2}}+2{{K}_{2}}S{{O}_{4}}+{{I}_{2}}\] |
| D. | \[CaOC{{l}_{2}}\to C{{a}^{+2}}+OC{{l}^{-}}+C{{l}^{-}}\] |
| Answer» B. \[PC{{l}_{5}}\to PC{{l}_{3}}+C{{l}_{2}}\] | |
| 575. |
The function of DNA in an organism is [DCE 2003] |
| A. | To assist in the synthesis of RNA molecule |
| B. | To store information of heredity characteristics |
| C. | To assist in the synthesis of proteins and polypeptides |
| D. | All of these |
| Answer» E. | |
| 576. |
Which category of salts of alkaline earth metals is not found in solid sate, but found in solution state? |
| A. | Carbonates |
| B. | Bicarbonates |
| C. | Hydroxides |
| D. | Sulphates |
| Answer» C. Hydroxides | |
| 577. |
A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct? |
| A. | \[MC{{l}_{2}}\] is more ionic than \[MC{{l}_{4}}\] |
| B. | \[MC{{l}_{2}}\] is more easily hydrolysed than \[MC{{l}_{4}}\] |
| C. | \[MC{{l}_{2}}\] is more volatile than \[MC{{l}_{4}}\] |
| D. | \[MC{{l}_{2}}\] is more soluble in anhydrous ethanol than \[MC{{l}_{4}}\] |
| Answer» B. \[MC{{l}_{2}}\] is more easily hydrolysed than \[MC{{l}_{4}}\] | |
| 578. |
Number of sigma bonds in \[{{P}_{4}}{{O}_{10}}\] is |
| A. | 6 |
| B. | 7 |
| C. | 17 |
| D. | 16 |
| Answer» E. | |
| 579. |
An isotope \[_{Y}{{A}^{X}}\] undergoes a series of \[m\] alpha and \[n\] beta disintegration to form a stable isotope \[_{Y-10}{{B}^{X-32}}\]. The values of \[m\] and \[n\] are respectively [MP PET 1995] |
| A. | 6 and 8 |
| B. | 8 and 10 |
| C. | 5 and 8 |
| D. | 8 and 6 |
| Answer» E. | |
| 580. |
Which of the following is not a sex hormone [MP PMT 2000] |
| A. | Testosterone |
| B. | Estrone |
| C. | Estradiol |
| D. | Cortisone |
| Answer» E. | |
| 581. |
The highest electrical conductivity of the following aqueous solutions is of [AIEEE 2005] |
| A. | 0.1 M acetic acid |
| B. | 0.1 M chloroacetic acid |
| C. | 0.1 M fluoroacetic acid |
| D. | 0.1 M difluoroacetic acid |
| Answer» E. | |
| 582. |
In Nessler's reagent for the detection of ammonia the active species is [Kerala (Med.) 2003] |
| A. | \[H{{g}_{2}}C{{l}_{2}}\] |
| B. | \[H{{g}^{2+}}\] |
| C. | \[H{{g}_{2}}{{I}_{2}}\] |
| D. | \[HgI_{4}^{2-}\] |
| Answer» E. | |
| 583. |
Which of the following is not formed? |
| A. | \[BeF_{4}^{2-}\] |
| B. | \[BeF_{3}^{-}\] |
| C. | \[BF_{4}^{-}\] |
| D. | \[BF_{6}^{3-}\] |
| Answer» E. | |
| 584. |
The enthalpy of vapourization of a liquid is \[30\,kJ\,mo{{l}^{-1}}\] and entropy of vapourization is \[75\,J\,mo{{l}^{-1}}K\]. The boiling point of the liquid at 1 atm is [IIT JEE (Screening) 2004] |
| A. | 250K |
| B. | 400K |
| C. | 450K |
| D. | 600K |
| Answer» C. 450K | |
| 585. |
Simultaneous determination of exact position and momentum of an electron is [BHU 1979] |
| A. | Possible |
| B. | Impossible |
| C. | Sometimes possible sometimes impossible |
| D. | None of the above |
| Answer» C. Sometimes possible sometimes impossible | |
| 586. |
The gaseous endothermic reaction : \[P+Q\to 3R\] at \[327{}^\circ C\] takes place spontaneously, because- |
| A. | \[\Delta H<0;\,\Delta S<0\] |
| B. | \[\Delta H>0;\,\Delta S>0\] |
| C. | \[\Delta H<0;\,\Delta S>0\] |
| D. | \[\Delta H>0;\,\Delta S<0\] |
| Answer» C. \[\Delta H<0;\,\Delta S>0\] | |
| 587. |
For a gaseous reaction: \[2{{A}_{2}}(g)+5{{B}_{2}}(g)\to 2{{A}_{2}}{{B}_{5}}(g)\] at \[{{27}^{o}}C\] the heat change at constant pressure is found to be \[-\,50160\,J\]. Calculate the value of internal energy change \[(\Delta E)\]. Given that R = 8.314 J/K mol. |
| A. | - 34689 J |
| B. | - 37689 J |
| C. | - 27689 J |
| D. | - 38689 J |
| Answer» C. - 27689 J | |
| 588. |
The difference between the heats of reaction at constant pressure and a constant volume for the reaction \[2{{C}_{6}}{{H}_{6\left( 1 \right)}}+15{{O}_{2(g)}}\xrightarrow{{}}12C{{O}_{2(g)}}+6{{H}_{2}}{{O}_{(I)}}\] in Kj is : |
| A. | -7.43 |
| B. | 3.72 |
| C. | -3.72 |
| D. | 7.43 |
| Answer» B. 3.72 | |
| 589. |
A compound AB whose electro negativity difference is 1.9. Atomic radius of A and B are 4 and \[2\,\overset{\text{o}}{\mathop{\text{A}}}\,\]. The distance between A & B means \[{{d}_{A-B}}\] is |
| A. | \[6.72\,\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| B. | \[5.82\,\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| C. | \[6.9\,\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| D. | \[7.5\,\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| Answer» C. \[6.9\,\overset{\text{o}}{\mathop{\text{A}}}\,\] | |
| 590. |
The correct order of the metallic character is: |
| A. | \[Na>Mg>Al>Si\] |
| B. | \[Mg>Na>Al>Si\] |
| C. | \[Al>Mg>Na>Si\] |
| D. | \[Si>Al>Na>Mg\] |
| Answer» B. \[Mg>Na>Al>Si\] | |
| 591. |
The gaseous HX molecule has a measured dipole moment of 4.0 D, which indicates that it is a very polar molecule. The separation between the nuclei in this molecule is \[2.67\times {{10}^{-8}}cm\] then the percentage ionic character in HX molecule: |
| A. | 0.78 |
| B. | 0.3125 |
| C. | 0.5025 |
| D. | None of these |
| Answer» C. 0.5025 | |
| 592. |
Which one is used as a food preservative [MP PET 1989; KCET 1999] |
| A. | Sodium acetate |
| B. | Sodium propionate |
| C. | Sodium benzoate |
| D. | Sodium oxalate |
| Answer» D. Sodium oxalate | |
| 593. |
Experimental evidence for the existence of the atomic nucleus comes from |
| A. | Millikan's oil drop experiment |
| B. | Atomic emission spectroscopy |
| C. | The magnetic bending of cathode rays |
| D. | Alpha scattering by a thin metal foil |
| Answer» E. | |
| 594. |
When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in Kelvin would be [IIT 2005] |
| A. | \[\frac{T}{{{2}^{(2/3)}}}\] |
| B. | T + \[\frac{2}{3\times 0.0821}\] |
| C. | T |
| D. | T - \[\frac{2}{3\times 0.0821}\] |
| Answer» E. | |
| 595. |
The volume of \[\frac{N}{10}\] NaOH require to neutralise 100 ml of \[\frac{N}{25}\] HCl is [Pb. CET 2000] |
| A. | 30 ml |
| B. | 100 ml |
| C. | 40 ml |
| D. | 25 ml |
| Answer» D. 25 ml | |
| 596. |
Increasing order of acid strength of halogen acid is [DCE 2000] |
| A. | \[HF<HCl<HBr<HI\] |
| B. | \[HCl<HBr<HI<HF\] |
| C. | \[HF<HI<HBr<HCl\] |
| D. | None of these |
| Answer» B. \[HCl<HBr<HI<HF\] | |
| 597. |
When primary amine is heated with \[C{{S}_{2}}\] in presence of excess mercuric chloride, it gives isothiocyanate. This reaction is called [KCET 1998; CPMT 1997] |
| A. | Hofmann bromide reaction |
| B. | Hofmann mustard oil reaction |
| C. | Carbylamine reaction |
| D. | Perkin reaction |
| Answer» C. Carbylamine reaction | |
| 598. |
The basis on the mode of their formation, the polymers can be classified [MP PET 1999] |
| A. | As addition polymers only |
| B. | As condensation polymers only |
| C. | As copolymers |
| D. | Both as addition and condensation polymers |
| Answer» E. | |
| 599. |
A reaction having equal activation energies for forward and reverse reaction has [MP PMT 2002] |
| A. | \[\Delta H=0\] |
| B. | \[\Delta S=0\] |
| C. | Zero order |
| D. | None of these |
| Answer» B. \[\Delta S=0\] | |
| 600. |
The bond angle between \[{{N}_{x}}\] in ice is closest to [CPMT 1989; UPSEAT 2002] |
| A. | \[{{120}^{o}}28'\] |
| B. | \[{{60}^{o}}\] |
| C. | \[{{90}^{o}}\] |
| D. | \[{{105}^{o}}\] |
| Answer» E. | |