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.
| 501. |
The first artificial disintegration of an atomic nucleus was achieved by [Kerala (Engg.) 2002] |
| A. | Geiger |
| B. | Wilson |
| C. | Madame curie |
| D. | Rutherford |
| E. | Soddy |
| Answer» E. Soddy | |
| 502. |
Which one is a mixed salt [DPMT 1985] |
| A. | \[NaHS{{O}_{4}}\] |
| B. | \[NaKS{{O}_{4}}\] |
| C. | \[{{K}_{4}}Fe{{(CN)}_{6}}\] |
| D. | \[Mg(OH)Cl\] |
| Answer» C. \[{{K}_{4}}Fe{{(CN)}_{6}}\] | |
| 503. |
The molecule that will have minimum dipole moment is |
| A. | \[C{{H}_{3}}Cl\] |
| B. | \[C{{H}_{2}}Cl\] |
| C. | \[CHC{{l}_{3}}\] |
| D. | \[CFC{{l}_{3}}\] |
| Answer» E. | |
| 504. |
Which of the following molecule is not having perfect geometrical shape. |
| A. | \[PC{{l}_{3}}{{F}_{2}}\] |
| B. | \[C{{F}_{4}}\] |
| C. | \[B{{F}_{2}}Cl\] |
| D. | \[{{[Si{{F}_{6}}]}^{2-}}\] |
| Answer» D. \[{{[Si{{F}_{6}}]}^{2-}}\] | |
| 505. |
1, 2-Dichloroethene shows [RPET 1999] |
| A. | Geometrical isomerism |
| B. | Optical isomerism |
| C. | Ring-chain isomerism |
| D. | Resonance |
| Answer» B. Optical isomerism | |
| 506. |
The reagents \[N{{H}_{4}}Cl\] and aqueous \[N{{H}_{3}}\] will precipitate [IIT 1991] |
| A. | \[C{{a}^{2+}}\] |
| B. | \[A{{l}^{+3}}\] |
| C. | \[M{{g}^{2+}}\] |
| D. | \[Z{{n}^{2+}}\] |
| Answer» C. \[M{{g}^{2+}}\] | |
| 507. |
The atomic weight of an element is double its atomic number. If there are four electrons in \[2p\] orbital, the element is [AMU 1983] |
| A. | \[C\] |
| B. | \[N\] |
| C. | \[O\] |
| D. | \[Ca\] |
| Answer» D. \[Ca\] | |
| 508. |
Pure water can be obtained from sea water by [CBSE PMT 2001] |
| A. | Centrifugation |
| B. | Plasmolysis |
| C. | Reverse osmosis |
| D. | Sedimentation |
| Answer» D. Sedimentation | |
| 509. |
If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be: |
| A. | \[\frac{1}{2}\frac{{{e}^{2}}}{r}\] |
| B. | \[-\frac{{{e}^{2}}}{r}\] |
| C. | \[\frac{m{{e}^{2}}}{r}\] |
| D. | \[-\frac{1}{2}\frac{{{e}^{2}}}{r}\] |
| Answer» E. | |
| 510. |
\[A{{l}_{2}}{{O}_{3}}\] can be converted to anhydrous \[AlC{{l}_{3}}\] by heating |
| A. | \[A{{l}_{2}}{{O}_{3}}\] with \[NaCl\] in solid state |
| B. | a mixture of \[A{{l}_{2}}{{O}_{3}}\] and carbon in dry \[C{{l}_{2}}\] gas |
| C. | \[A{{l}_{2}}{{O}_{3}}\] wither gas |
| D. | \[A{{l}_{2}}{{O}_{3}}\] with \[HCl\] gas |
| Answer» C. \[A{{l}_{2}}{{O}_{3}}\] wither gas | |
| 511. |
Which of the following has correct increasing basic strength? |
| A. | \[MgO<BeO<CaO<BaO\] |
| B. | \[BeO<MgO<CaO<BaO\] |
| C. | \[BaO<CaO<MgO<BeO\] |
| D. | \[CaO<BaO<BeO<MgO\] |
| Answer» C. \[BaO<CaO<MgO<BeO\] | |
| 512. |
The bond angle in \[P{{H}_{3}}\]would be expected to be close to |
| A. | \[{{90}^{o}}\] |
| B. | \[{{105}^{o}}\] |
| C. | \[{{109}^{o}}\] |
| D. | \[{{120}^{o}}\] |
| Answer» B. \[{{105}^{o}}\] | |
| 513. |
Which of the following molecule contains asymmetric carbon atom [JIPMER 2002] |
| A. | \[C{{H}_{3}}CHClCOOH\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}COOH\] |
| C. | \[ClC{{H}_{2}}C{{H}_{2}}COOH\] |
| D. | \[C{{l}_{2}}CHCOOH\] |
| Answer» B. \[C{{H}_{3}}C{{H}_{2}}COOH\] | |
| 514. |
A similarity between optical and geometrical isomerism is that [AIEEE 2002] |
| A. | Each forms equal number of isomers for a given compound |
| B. | If in a compound one is present then so is the other |
| C. | Both are included in stereoisomerism |
| D. | They have no similarity |
| Answer» D. They have no similarity | |
| 515. |
If the light waves pass through a nicol prism then all the oscillations occur only in one plane, such beam of light is called as [Kerala (Med.) 2002] |
| A. | Non-polarised light |
| B. | Plane polarised light |
| C. | Polarised light |
| D. | Optical light |
| Answer» C. Polarised light | |
| 516. |
The disintegration constant of radium with half-life 1600 years is [MHCET 2004] |
| A. | \[2.12\times {{10}^{-4}}yea{{r}^{-1}}\] |
| B. | \[4.33\times {{10}^{-4}}yea{{r}^{-1}}\] |
| C. | \[3.26\times {{10}^{-3}}yea{{r}^{-1}}\] |
| D. | \[4.33\times {{10}^{-12}}yea{{r}^{-1}}\] |
| Answer» C. \[3.26\times {{10}^{-3}}yea{{r}^{-1}}\] | |
| 517. |
In hydrolysis of a salt of weak acid and strong base, \[{{A}^{-}}+{{H}_{2}}O\] ⇄ \[HA+O{{H}^{-}},\] the hydrolysis constant \[({{K}_{h}})\] is equal to.? [Orissa JEE 2002] |
| A. | \[\frac{{{K}_{w}}}{{{K}_{a}}}\] |
| B. | \[\frac{{{K}_{w}}}{{{K}_{b}}}\] |
| C. | \[\sqrt{\frac{{{K}_{a}}}{C}}\] |
| D. | \[\frac{{{K}_{w}}}{{{K}_{a}}\times {{K}_{b}}}\] |
| Answer» B. \[\frac{{{K}_{w}}}{{{K}_{b}}}\] | |
| 518. |
Phenol is used in the manufacture of [AIIMS 1996] |
| A. | Bakelite |
| B. | Polystyrene |
| C. | Nylon |
| D. | PVC |
| Answer» B. Polystyrene | |
| 519. |
When electric current is supplied through an ionic hydride of fused state, then [Kerala CET 2005] |
| A. | Hydrogen is obtained at anode |
| B. | Hydrogen is obtained at cathode |
| C. | No change |
| D. | Hydride ion moves towards cathode |
| E. | hydride ion present in solution |
| Answer» B. Hydrogen is obtained at cathode | |
| 520. |
The energy of an electron in first Bohr orbit of Pi- atom is \[-13.6\text{ }eV\]. The energy value of electron in the excited state of \[L{{i}^{2+}}\] is: |
| A. | \[-27.2\text{ }eV\] |
| B. | \[30.6\text{ }eV\] |
| C. | \[-30.6eV\] |
| D. | \[27.2\text{ }eV\] |
| Answer» D. \[27.2\text{ }eV\] | |
| 521. |
If the amount of radioactive substance is increased three times, the number of atoms disintegrated per unit time would [MP PMT 1994] |
| A. | Be double |
| B. | Be triple |
| C. | Remain one third |
| D. | Not change |
| Answer» C. Remain one third | |
| 522. |
The equivalent weight of an element is 4. Its chloride has a V.D 59.25. Then the valency of the element is [BHU 1997] |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» C. 2 | |
| 523. |
The isoelectronic pair is [AIIMS 2005] |
| A. | \[C{{l}_{2}}O,\ ICl_{2}^{-}\] |
| B. | \[ICl_{2}^{-},Cl{{O}_{2}}\ \] |
| C. | \[IF_{2}^{+},\ I_{3}^{-}\] |
| D. | \[ClO_{2}^{-},\ CIF_{2}^{+}\] |
| Answer» E. | |
| 524. |
In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements? |
| A. | \[\underline{N}{{O}_{2}}\] and \[{{\underline{N}}_{2}}{{O}_{4}}\] |
| B. | \[{{\underline{P}}_{2}}{{O}_{5}}\] and \[{{\underline{P}}_{4}}{{O}_{10}}\] |
| C. | \[{{\underline{N}}_{2}}O\] and \[\underline{N}O\] |
| D. | \[\underline{S}\,{{O}_{2}}\] and \[\underline{S}\,{{O}_{3}}\] |
| Answer» E. | |
| 525. |
Hydrolysis constant for a salt of weak acid and weak base would be [RPMT 1999] |
| A. | \[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{a}}}\] |
| B. | \[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{b}}}\] |
| C. | \[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{a}}{{K}_{b}}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 526. |
Which of the following is used in fire extinguishers [AFMC 1993] |
| A. | \[C{{H}_{4}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[C{{H}_{2}}C{{l}_{2}}\] |
| D. | \[CC{{l}_{4}}\] |
| Answer» E. | |
| 527. |
Isomerism due to rotation round single bond of carbon-carbon is [UPSEAT 2003] |
| A. | Conformation |
| B. | Enantiomerism |
| C. | Diasterio isomerism |
| D. | Position isomerism |
| Answer» B. Enantiomerism | |
| 528. |
\[{{\psi }^{2}}=0\] represent |
| A. | node |
| B. | orbital |
| C. | zero amplitude of wave |
| D. | wave function |
| Answer» B. orbital | |
| 529. |
Correct set of four quantum numbers for the outermost electron of rubidium (Z = 37) is - |
| A. | 5, 0, 0, 1/2 |
| B. | 5, 1, 0, 1/2 |
| C. | 5, 1, 1, 1/2 |
| D. | 6, 0, 0, 1/2 |
| Answer» B. 5, 1, 0, 1/2 | |
| 530. |
Which of the following statements is true about \[\left[ Cu\,{{\left( N{{H}_{3}} \right)}_{4}} \right]S{{O}_{4}}\] [CPMT 1988] |
| A. | It has coordinate and covalent bonds |
| B. | It has only coordinate bonds |
| C. | It has only electrovalent bonds |
| D. | It has electrovalent, covalent and coordinate bonds |
| Answer» E. | |
| 531. |
\[{{H}_{2}}S\] gas when passed through a solution of a contains HCl precipitate the cations of group of qualitative analysis but not those belonging to the fourth group. It is because [CBSE PMT 2005] |
| A. | Presence of HCl decreases the sulphide ion concentration |
| B. | Presence of HCl increases the sulphide ion concentration |
| C. | Solubility product of group II sulphides is more than that of group IV sulphides |
| D. | Sulphides of group IV Cations are in \[HCl\] |
| Answer» B. Presence of HCl increases the sulphide ion concentration | |
| 532. |
A group 14 element is oxidised to form corresponding oxide which is gaseous in nature, when dissolved in water pH of the water decreases further addition of group 2 hydroxides leads to precipitation. This oxide can be |
| A. | \[Ge{{O}_{2}}\] |
| B. | CO |
| C. | \[C{{O}_{2}}\] |
| D. | \[Sn{{O}_{2}}\] |
| Answer» D. \[Sn{{O}_{2}}\] | |
| 533. |
The compound \[{{C}_{4}}{{H}_{10}}O\] can show [IIT-JEE 1981; MP PET 2000] |
| A. | Metamerism |
| B. | Functional isomerism |
| C. | Positional isomerism |
| D. | All types |
| Answer» E. | |
| 534. |
Which is not found in alkenes [AIIMS 1982; RPMT 1999] |
| A. | Chain isomerism |
| B. | Geometrical isomerism |
| C. | Metamerism |
| D. | Position isomerism |
| Answer» D. Position isomerism | |
| 535. |
How many isomers of \[{{C}_{5}}{{H}_{11}}OH\] will be primary alcohols [CBSE PMT 1992] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 536. |
Nitrate is confirmed by ring test. The brown colour of the ring is due to the formation of [EAMCET 1979; AFMC 1981, 88, 90; RPET 1999; MP PMT 2000; MP PET 2002; CPMT 2004] |
| A. | Ferrous nitrite |
| B. | \[FeS{{O}_{4}}NO\] |
| C. | \[FeS{{O}_{4}}N{{O}_{2}}\] |
| D. | Ferrous nitrate |
| Answer» C. \[FeS{{O}_{4}}N{{O}_{2}}\] | |
| 537. |
A deep brown gas is formed by mixing two colourless gases which are |
| A. | \[N{{O}_{2}}\] and \[{{O}_{2}}\] |
| B. | \[{{N}_{2}}O\] and NO |
| C. | NO and \[{{O}_{2}}\] |
| D. | \[N{{H}_{3}}\] and \[HCl\] |
| Answer» D. \[N{{H}_{3}}\] and \[HCl\] | |
| 538. |
Which of the following pair of ions makes the water hard [AMU 2002] |
| A. | \[N{{a}^{+}},\ SO_{4}^{2-}\] |
| B. | \[{{K}^{+}},\ HCO_{3}^{-}\] |
| C. | \[C{{a}^{2+}},\ NO_{3}^{-}\] |
| D. | \[NH_{4}^{+},\ C{{l}^{-}}\] |
| Answer» C. \[C{{a}^{2+}},\ NO_{3}^{-}\] | |
| 539. |
Size of colloidal particle is [BCECE 2005] |
| A. | 1 nm |
| B. | 1 ? 100 nm |
| C. | > 100 nm |
| D. | > 1000 nm |
| Answer» C. > 100 nm | |
| 540. |
Thalium shows different oxidation states because [AIIMS 1982] |
| A. | It is a transition element |
| B. | Of inert pair effect |
| C. | Of its amphoteric character |
| D. | Of its higher reactivity |
| Answer» C. Of its amphoteric character | |
| 541. |
A gaseous compound is composed of 85.7% by mass of carbon and 14.3% by mass of hydrogen. Its density is 22.8 g/L at 350 K and 1.0 atm pressure. Calculate the molecular formula of compound. |
| A. | \[{{C}_{5}}{{H}_{10}}\] |
| B. | \[{{C}_{6}}{{H}_{12}}\] |
| C. | \[{{C}_{4}}{{H}_{8}}\] |
| D. | \[{{C}_{8}}{{H}_{18}}\] |
| Answer» D. \[{{C}_{8}}{{H}_{18}}\] | |
| 542. |
If 3 moles of \[{{H}_{2}}\] and 1 mole of \[{{N}_{2}}\] are completely converted into \[N{{H}_{3}},\] the ratio of initial and final volume at the same temp. and pressure will be: |
| A. | 1 |
| B. | 3 |
| C. | 2 |
| D. | 4.2 |
| Answer» D. 4.2 | |
| 543. |
1 mol of a gaseous aliphahatic compound\[{{C}_{n}}{{H}_{3n}}{{O}_{m}}\] is completely burnt in an excess of oxygen. The contraction in volume is (assume water get condensed out) |
| A. | \[\left( 1+\frac{1}{2}n-\frac{3}{4}m \right)\] |
| B. | \[\left( 1+\frac{3}{4}n-\frac{1}{4}m \right)\] |
| C. | \[\left( 1-\frac{1}{2}n-\frac{3}{4}m \right)\] |
| D. | \[\left( 1+\frac{3}{4}n-\frac{1}{2}m \right)\] |
| Answer» E. | |
| 544. |
The order in which the following oxides are arranged according to decreasing basic nature is [CPMT 1985] |
| A. | \[N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO\] |
| B. | \[MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO,\,N{{a}_{2}}O\] |
| C. | \[A{{l}_{2}}{{O}_{3}},\,MgO,\,CuO,\,N{{a}_{2}}O\] |
| D. | \[CuO,\,N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}}\] |
| Answer» B. \[MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO,\,N{{a}_{2}}O\] | |
| 545. |
Cosin used to detect end point of precipitation titration by adsorption is called [KCET (Med). 2000] |
| A. | Absorption indicator |
| B. | Adsorption indicator |
| C. | Chemical indicator |
| D. | Normal indicator |
| Answer» C. Chemical indicator | |
| 546. |
Which of the following are isoelectronic and isostructural \[NO_{3}^{-},\,CO_{3}^{2-},\,ClO_{3}^{-},\,S{{O}_{3}}\] [IIT Screening 2003] |
| A. | \[NO_{3}^{-},\,CO_{3}^{2-}\] |
| B. | \[S{{O}_{3}},\,NO_{3}^{-}\] |
| C. | \[ClO_{3}^{-},\,CO_{3}^{2-}\] |
| D. | \[CO_{3}^{2-},\,S{{O}_{3}}\] |
| Answer» B. \[S{{O}_{3}},\,NO_{3}^{-}\] | |
| 547. |
\[Xe{{F}_{2}}\] molecule is [BHU 1982] |
| A. | Linear |
| B. | Triangular planar |
| C. | Pyramidal |
| D. | Square planar |
| Answer» B. Triangular planar | |
| 548. |
Which of the following is the correct reducing order of bond-angle [BHU 2000] |
| A. | \[N{{H}_{3}}<C{{H}_{4}}<{{C}_{2}}{{H}_{2}}<{{H}_{2}}O\] |
| B. | \[{{C}_{2}}{{H}_{2}}>N{{H}_{3}}>{{H}_{2}}O<C{{H}_{4}}\] |
| C. | \[N{{H}_{3}}>{{H}_{2}}O>C{{H}_{4}}<{{C}_{2}}{{H}_{2}}\] |
| D. | \[{{H}_{2}}O<N{{H}_{3}}>C{{H}_{4}}<{{C}_{2}}{{H}_{2}}\] |
| Answer» C. \[N{{H}_{3}}>{{H}_{2}}O>C{{H}_{4}}<{{C}_{2}}{{H}_{2}}\] | |
| 549. |
The end product of \[(4n+1)\] radioactive disintegration series is [MP PMT 1999] |
| A. | \[_{83}B{{i}^{209}}\] |
| B. | \[_{84}P{{o}^{210}}\] |
| C. | \[_{82}P{{b}^{208}}\] |
| D. | \[_{82}P{{b}^{207}}\] |
| Answer» B. \[_{84}P{{o}^{210}}\] | |
| 550. |
Blue litmus turns red in which of the following mixture of acid and base? |
| A. | \[100\,mL\] of \[1\times {{10}^{-2}}M\,{{H}_{2}}S{{O}_{4}}\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,Ca{{\left( OH \right)}_{2}}\] |
| B. | \[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]+ \[100\,mL\] of \[1\times {{10}^{-2}}M\,Ba{{\left( OH \right)}_{2}}\] |
| C. | \[100\,mL\] of \[1\times {{10}^{-2}}M\,{{H}_{2}}S{{O}_{4}}\]\[+\,10\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\] |
| D. | \[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\] |
| Answer» D. \[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\] | |