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.
| 9301. |
The calorific value is maximum in case of [Kerala (Med.) 2000] |
| A. | Milk |
| B. | Proteins |
| C. | Minerals |
| D. | Carbohydrates |
| Answer» E. | |
| 9302. |
Least ionic character is found in [CPMT 1993] |
| A. | \[Mg\] |
| B. | \[Sr\] |
| C. | \[Ca\] |
| D. | \[Ra\] |
| Answer» B. \[Sr\] | |
| 9303. |
Peroxide bond is present in [RPET 2003] |
| A. | \[MgO\] |
| B. | \[CaO\] |
| C. | \[L{{i}_{2}}O\] |
| D. | \[Ba{{O}_{2}}\] |
| Answer» E. | |
| 9304. |
\[Fe{{S}_{2}}\] is [RPET 1999] |
| A. | Artificial silver |
| B. | Fool?s gold |
| C. | Mohr?s salt |
| D. | Cast iron |
| Answer» C. Mohr?s salt | |
| 9305. |
2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly [AIEEE 2005] |
| A. | 1-bromo-2-methylbutane |
| B. | 2-bromo-2-methylbutane |
| C. | 2-bromo-3-methylbutane |
| D. | 1-bromo-3-methylbutane |
| Answer» C. 2-bromo-3-methylbutane | |
| 9306. |
Which gas is liberated when \[A{{l}_{4}}{{C}_{3}}\]is hydrolysed [AFMC 2005] |
| A. | \[C{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{2}}\] |
| C. | \[{{C}_{2}}{{H}_{6}}\] |
| D. | \[C{{O}_{2}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{2}}\] | |
| 9307. |
In compound X, all the bond angles are exactly \[{{109}^{o}}28',\] X is [DPMT 2000] |
| A. | Chloroform |
| B. | Carbon tetrachloride |
| C. | Chloromethane |
| D. | Iodoform |
| Answer» C. Chloromethane | |
| 9308. |
The coagulation power of an electrolyte for arsenious sulphide decreases in the order [JIPMER 1997] |
| A. | \[N{{a}^{+}},\,A{{l}^{+3}},\,B{{a}^{+2}}\] |
| B. | \[PO_{4}^{-3},\,SO_{4}^{-2},\,C{{l}^{-}}\] |
| C. | \[A{{l}^{+3}},\,B{{a}^{+2}},\,N{{a}^{+}}\] |
| D. | \[C{{l}^{-}},\,SO_{4}^{-2},\,PO_{4}^{-3}\] |
| Answer» D. \[C{{l}^{-}},\,SO_{4}^{-2},\,PO_{4}^{-3}\] | |
| 9309. |
The strongest acid is [DPMT 2000] |
| A. | \[{{H}_{3}}As{{O}_{4}}\] |
| B. | \[{{H}_{3}}As{{O}_{3}}\] |
| C. | \[{{H}_{3}}P{{O}_{3}}\] |
| D. | \[{{H}_{3}}P{{O}_{4}}\] |
| Answer» E. | |
| 9310. |
The number of b-particles emitted in radioactive change \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}{{+}_{2}}H{{e}^{4}}\] is [KCET 2000] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 10 |
| Answer» D. 10 | |
| 9311. |
Which of the following reactions takes place when a mixture of concentrated \[HN{{O}_{3}}\] and \[{{H}_{2}}S{{O}_{4}}\] reacts on benzene at \[350K\] [CPMT 1985] |
| A. | Sulphonation |
| B. | Nitration |
| C. | Hydrogenation |
| D. | Dehydration |
| Answer» C. Hydrogenation | |
| 9312. |
Potassium ferrocyanide is a [AFMC 2000] |
| A. | Normal salt |
| B. | Mixed salt |
| C. | Double salt |
| D. | Complex salt |
| Answer» E. | |
| 9313. |
The most electropositive amongst the alkaline earth metals is [MP PMT 1993] |
| A. | Beryllium |
| B. | Magnesium |
| C. | Calcium |
| D. | Barium |
| Answer» E. | |
| 9314. |
The dark red colour of bombs in fireworks is due to the presence of [Roorkee 1989; DPMT 2001 MP PMT 1985; AFMC 1989; Roorkee 1989] |
| A. | \[Na\] |
| B. | \[Ba\] |
| C. | \[Sr\] |
| D. | \[K\] |
| Answer» D. \[K\] | |
| 9315. |
Which of the following is not a water absorber and dehydrating substance [CBSE 1989; JIPMER 2002] |
| A. | Silica gel |
| B. | \[{{P}_{2}}{{O}_{5}}\] |
| C. | Conc. \[{{H}_{2}}S{{O}_{4}}\] |
| D. | Aqueous \[CaC{{l}_{2}}\] |
| Answer» E. | |
| 9316. |
Anhydrous \[AlC{{l}_{3}}\] is used in the Friedel-Craft?s reaction because it is [CBSE PMT 1991] |
| A. | Electron rich |
| B. | Soluble in ether |
| C. | Insoluble to chloride and aluminium ions |
| D. | Electron deficient |
| Answer» E. | |
| 9317. |
Which of the following solutions will have the highest boiling point [DPMT 1991; CPMT 1991] |
| A. | 1% glucose |
| B. | 1% sucrose |
| C. | 1% \[NaCl\] |
| D. | 1% \[CaC{{l}_{2}}\] |
| Answer» E. | |
| 9318. |
The order of increasing reactivity towards HCl of the following compounds will be (1) \[C{{H}_{2}}=C{{H}_{2}}\] (2) \[{{(C{{H}_{3}})}_{2}}C=C{{H}_{2}}\] (3) \[C{{H}_{3}}CH=CHC{{H}_{3}}\] [MP PET 1994] |
| A. | \[1<2<3\] |
| B. | \[1<3<2\] |
| C. | \[3<2<1\] |
| D. | \[2<1<3\] |
| Answer» D. \[2<1<3\] | |
| 9319. |
Molten sodium is used in nuclear reactors to [KCET 1989] |
| A. | Absorb neutrons in order to control the chain reaction |
| B. | Slow down the fast neutrons |
| C. | Absorb the heat generated by nuclear fission |
| D. | Extract radio-isotopes produced in the reactor |
| Answer» D. Extract radio-isotopes produced in the reactor | |
| 9320. |
Which one of the following forms micelles in aqueous solution above certain concentration ? [CBSE PMT 2005] |
| A. | Urea |
| B. | Dodecyl trimethyl ammonium chloride |
| C. | Pyridinium chloride |
| D. | Glucose |
| Answer» C. Pyridinium chloride | |
| 9321. |
Solubility product for salt \[A{{B}_{2}}\] is \[4\times {{10}^{-12}}\]. Calculate solubility [RPET 2003] |
| A. | \[1\times {{10}^{-3}}gm\,\,mol\,/\,litre\] |
| B. | \[1\times {{10}^{-5}}gm\,\,mol\,/\,litre\] |
| C. | \[1\times {{10}^{-4}}gm\,\,mol\,/\,litre\] |
| D. | \[1\times {{10}^{-2}}gm\,\,mol\,/\,litre\] |
| Answer» D. \[1\times {{10}^{-2}}gm\,\,mol\,/\,litre\] | |
| 9322. |
The product formed when acetylene is passed through red hot tube is [BHU 1989; RPMT 2003] |
| A. | Benzene |
| B. | Cyclohexane |
| C. | Neoprene |
| D. | Ethane |
| Answer» B. Cyclohexane | |
| 9323. |
The inorganic origin of petroleum is indicated by the fact that [Roorkee 1990] |
| A. | Its constituents can be separated by fractional distillation |
| B. | Carbon and hydrocarbon can combine by absorption of solar energy to give hydrocarbons |
| C. | Petroleum contains traces of chlorophyll |
| D. | Oil fields are located with the help of seismograph |
| Answer» C. Petroleum contains traces of chlorophyll | |
| 9324. |
Rutherford's experiment on scattering of particles showed for the first time that the atom has [IIT 1981; NCERT 1981; CMC Vellore 1991; CPMT 1984; Kurukshetra CEE 1998] |
| A. | Electrons |
| B. | Protons |
| C. | Nucleus |
| D. | Neutrons |
| Answer» D. Neutrons | |
| 9325. |
Which of the following metals corrodes readily in moist air [CPMT 1972, 82; CBSE PMT 1989] |
| A. | Gold |
| B. | Silver |
| C. | Nickel |
| D. | Iron |
| Answer» E. | |
| 9326. |
\[C{{H}_{4}}\] is formed when [AFMC 1987] |
| A. | Sodium acetate is heated with sodalime |
| B. | Iodomethane is reduced |
| C. | Aluminium carbide reacts with water |
| D. | All of these |
| Answer» E. | |
| 9327. |
0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The molecular weight of the acid will be [CPMT 1989] |
| A. | 32 |
| B. | 64 |
| C. | 128 |
| D. | 256 |
| Answer» D. 256 | |
| 9328. |
KI and \[CuS{{O}_{4}}\] solution when mixed, give [CPMT 2004; UPSEAT 2004] |
| A. | \[Cu{{I}_{2}}+{{K}_{2}}S{{O}_{4}}\] |
| B. | \[C{{u}_{2}}{{I}_{2}}+{{K}_{2}}S{{O}_{4}}\] |
| C. | \[{{K}_{2}}S{{O}_{4}}+C{{u}_{2}}{{I}_{2}}+{{I}_{2}}\] |
| D. | \[{{K}_{2}}S{{O}_{4}}+Cu{{I}_{2}}+{{I}_{2}}\] |
| Answer» D. \[{{K}_{2}}S{{O}_{4}}+Cu{{I}_{2}}+{{I}_{2}}\] | |
| 9329. |
Acidified potassium permanganate solution is decolourised by [MNR 1984] |
| A. | Bleaching powder |
| B. | White vitriol |
| C. | Mohr's salt |
| D. | Microcosmic salt |
| E. | Laughing gas |
| Answer» D. Microcosmic salt | |
| 9330. |
Acetylene reacts with ammonical \[AgN{{O}_{3}}\] forming [MH CET 1999; CPMT 1984, 86; MP PMT 1997] |
| A. | Silver acetylene |
| B. | Silver acetate |
| C. | Metal silver |
| D. | Silver mirror |
| Answer» B. Silver acetate | |
| 9331. |
Stainless steel contains ........... \[Cr\] |
| A. | 0.14 |
| B. | 0.05 |
| C. | 0.5 |
| D. | 0.025 |
| Answer» B. 0.05 | |
| 9332. |
For which reaction from the following, \[\Delta S\] will be maximum [AlIMS 1982, 83, 94; AMU 2000] |
| A. | \[Ca(s)+\frac{1}{2}{{O}_{2}}(g)\to CaO(s)\] |
| B. | \[CaC{{O}_{3}}(s)\to CaO(s)+C{{O}_{2}}(g)\] |
| C. | \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] |
| D. | \[{{N}_{2}}(g)+{{O}_{2}}(g)\to 2NO(g)\] |
| Answer» C. \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] | |
| 9333. |
Orlon is a polymer of [NCERT 1984; BHU 1995; AFMC 1997; DCE 2001] |
| A. | Styrene |
| B. | Tetrafluoro ethylene |
| C. | Vinyl chloride |
| D. | Acrylonitrile |
| Answer» E. | |
| 9334. |
Davisson and Germer's experiment showed that [MADT Bihar 1983] |
| A. | \[\beta \]-particles are electrons |
| B. | Electrons come from nucleus |
| C. | Electrons show wave nature |
| D. | None of the above |
| Answer» D. None of the above | |
| 9335. |
The co-ordination number of copper in cuprammonium sulphate is [KCET 1991, 92] |
| A. | 2 |
| B. | 6 |
| C. | 4 |
| D. | -4 |
| Answer» D. -4 | |
| 9336. |
Copper sulphate is not used |
| A. | In electrotyping |
| B. | In dyeing and calicoprinting |
| C. | In detecting water |
| D. | As fertilizer |
| Answer» E. | |
| 9337. |
A catalyst is used to [Pb.CET 2000] |
| A. | Increase the product |
| B. | Increase or decrease the rate of reaction |
| C. | Increase or decrease the products |
| D. | Decrease the products |
| Answer» C. Increase or decrease the products | |
| 9338. |
Ammonia forms the complex ion \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] with copper ions in alkaline solutions but not in acidic solution. What is the reason for it [AIEEE 2003] |
| A. | In acidic solutions hydration protects copper ions |
| B. | In acidic solutions protons coordinate with ammonia molecules forming \[NH_{4}^{+}\] ions and \[N{{H}_{3}}\]molecules are not available |
| C. | In alkaline solutions insoluble \[Cu{{(OH)}_{2}}\] is precipitated which is soluble in excess of any alkali |
| D. | Copper hydroxide is an amphoteric substance |
| Answer» C. In alkaline solutions insoluble \[Cu{{(OH)}_{2}}\] is precipitated which is soluble in excess of any alkali | |
| 9339. |
The molar conductances of \[NaCl,\,HCl\] and \[C{{H}_{3}}COONa\] at infinite dilution are 126.45, 426.16 and \[91\,oh{{m}^{-1}}\,c{{m}^{2}}\,mo{{l}^{-1}}\] respectively. The molar conductance of \[C{{H}_{3}}COOH\] at infinite dilution is [CBSE PMT 1997] |
| A. | \[201.28\,oh{{m}^{-1}}\,c{{m}^{2}}\,mo{{l}^{-1}}\] |
| B. | \[390.71\,oh{{m}^{-1}}c{{m}^{2}}\,mo{{l}^{-1}}\] |
| C. | \[698.28\,oh{{m}^{-1}}\,c{{m}^{2}}\,mo{{l}^{-1}}\] |
| D. | \[540.48\,oh{{m}^{-1}}c{{m}^{2}}\,mo{{l}^{-1}}\] |
| Answer» C. \[698.28\,oh{{m}^{-1}}\,c{{m}^{2}}\,mo{{l}^{-1}}\] | |
| 9340. |
The name of \[Cl{{H}_{2}}C-\underset{Br}{\mathop{\underset{|\,\,}{\mathop{C}}\,}}\,=\underset{Br}{\mathop{\underset{|\,\,}{\mathop{C}}\,}}\,-C{{H}_{2}}Cl\] according to IUPAC nomenclature system is : [MP PMT 2002] |
| A. | 2,3 dibromo-1, 4-dichlorobutene-2 |
| B. | 1, 4-dichloro-2, 3-bromobutene-2 |
| C. | Dichlorodibromobutene |
| D. | Dichlorodibromobutane |
| Answer» B. 1, 4-dichloro-2, 3-bromobutene-2 | |
| 9341. |
The IUPAC name of acraldehyde is [MP PMT 2000] |
| A. | Prop-2-ene-1-al |
| B. | Propenyl aldehyde |
| C. | But-2-ene-1-al |
| D. | Propenal |
| Answer» B. Propenyl aldehyde | |
| 9342. |
Solid \[C{{O}_{2}}\] is known as dry ice, because [Pb. CET 2000] |
| A. | It melts at \[0{}^\circ C\] |
| B. | It evaporates at \[40{}^\circ C\] |
| C. | It evaporates at \[-78{}^\circ C\] without melting |
| D. | Its boiling point is more than \[199{}^\circ C\] |
| Answer» D. Its boiling point is more than \[199{}^\circ C\] | |
| 9343. |
Iron loses magnetic property at [KCET 2002] |
| A. | Melting point |
| B. | 1000K |
| C. | Curie point |
| D. | Boiling point |
| Answer» D. Boiling point | |
| 9344. |
Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is [Kerala PMT 2004] |
| A. | \[\frac{4{{\pi }^{2}}m{{r}^{2}}}{nh}\] |
| B. | \[\frac{nh}{4{{\pi }^{2}}mr}\] |
| C. | \[\frac{nh}{4{{\pi }^{2}}m{{r}^{2}}}\] |
| D. | \[\frac{h}{2\pi mr}\] |
| Answer» B. \[\frac{nh}{4{{\pi }^{2}}mr}\] | |
| 9345. |
Petroleum consists mainly of [CPMT 1985, 94; KCET 1991] |
| A. | Aliphatic hydrocarbons |
| B. | Aromatic hydrocarbons |
| C. | Aliphatic alcohols |
| D. | None of these |
| Answer» B. Aromatic hydrocarbons | |
| 9346. |
For reaction \[2Cl(s)\to C{{l}_{2}}(s)\], the signs of \[\Delta H\] and \[\Delta S\] respectively are [KCET 1996] |
| A. | +, ? |
| B. | +, + |
| C. | ?, ? |
| D. | ?, + |
| Answer» D. ?, + | |
| 9347. |
Which of the following is used as a catalyst in the manufacture of toluene from benzene with \[C{{H}_{3}}Cl\] [CPMT 1985] |
| A. | \[Ni\] |
| B. | Anhydrous \[AlC{{l}_{3}}\] |
| C. | \[Pd\] |
| D. | \[Pt\] |
| Answer» C. \[Pd\] | |
| 9348. |
Which of the following are produced from coaltar [MNR 1987; UPSEAT 2002] |
| A. | Synthetic dyes |
| B. | Drugs |
| C. | Perfumes |
| D. | All the three |
| Answer» E. | |
| 9349. |
It has been observed that gaseous hydrogen chloride is a very poor conductor of electricity but a solution of hydrogen chloride gas in water is a good conductor of electricity. This is due to the fact that [NCERT 1976] |
| A. | Water is good conductor of electricity |
| B. | Hydrogen chloride gas in water solution ionizes |
| C. | A gas is non-conductor but a liquid conducts electricity |
| D. | Gas does not obey Ohm's law whereas solution does |
| Answer» C. A gas is non-conductor but a liquid conducts electricity | |
| 9350. |
Which of the following statement is not correct [MP PET 1993] |
| A. | Physical adsorption is due to Vander Wall's forces |
| B. | Chemical adsorption decreases at high temperature and low pressure |
| C. | Physical adsorption is reversible |
| D. | Adsorption energy for a chemical adsorption is generally greater than that of physical adsorption |
| Answer» C. Physical adsorption is reversible | |