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.
| 301. |
The isomerism shown by n-butyl alcohol and isobutyl alcohol is [RPMT 2000] |
| A. | Metamerism |
| B. | Chain |
| C. | Position |
| D. | Stereo |
| Answer» C. Position | |
| 302. |
Which is optically active [MH CET 2001] |
| A. | \[C{{H}_{2}}C{{l}_{2}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | Meso form of tartaric acid |
| D. | Glyceraldehyde |
| Answer» E. | |
| 303. |
Volume of \[\frac{N}{10}{{H}_{2}}S{{O}_{4}}\] required to neutralize 10 ml 5 N \[N{{a}_{2}}C{{O}_{3}}\] is |
| A. | 100 ml |
| B. | 50 ml |
| C. | 500 ml |
| D. | 1000 ml |
| Answer» D. 1000 ml | |
| 304. |
Which of the following acts as an oxidizing as well as reducing agent? |
| A. | \[N{{a}_{2}}O\] |
| B. | \[N{{a}_{2}}{{O}_{2}}\] |
| C. | \[NaN{{O}_{3}}\] |
| D. | \[NaN{{O}_{2}}\] |
| Answer» E. | |
| 305. |
When \[\alpha \]-particles are sent through a thin metal foil, most of them go straight through the foil because (one or more are correct) [IIT 1984] |
| A. | Alpha particles are much heavier than electrons |
| B. | Alpha particles are positively charged |
| C. | Most part of the atom is empty space |
| D. | Alpha particles move with high velocity |
| Answer» D. Alpha particles move with high velocity | |
| 306. |
Which has maximum bond angle [CPMT 1993] |
| A. | \[CH{{F}_{3}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[CHB{{r}_{3}}\] |
| D. | All have maximum bond angle |
| Answer» B. \[CHC{{l}_{3}}\] | |
| 307. |
Mohr's salt is a [MNR 1986] |
| A. | Normal salt |
| B. | Acid salt |
| C. | Basic salt |
| D. | Double salt |
| Answer» E. | |
| 308. |
The number of hydroxide ions, produced by one molecule of sodium carbonate \[(N{{a}_{2}}C{{O}_{3}})\] on hydrolysis is [Pb. CET 2002] |
| A. | 2 |
| B. | 1 |
| C. | 3 |
| D. | 4 |
| Answer» B. 1 | |
| 309. |
Specific volume of cylindrical virus particle is \[6.02\times {{10}^{-2}}cc/g.\] whose radius and length are 7 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] & 10 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] respectively.If \[{{N}_{A}}=6.02\times {{10}^{23}}mo{{l}^{-1}}\] find molecular weight of virus |
| A. | \[3.08\times {{10}^{3}}kg/mol\] |
| B. | \[3.08\times {{10}^{4}}kg/mol\] |
| C. | \[1.54\times {{10}^{4}}kg/mol\] |
| D. | \[15.4kg/mol\] |
| Answer» E. | |
| 310. |
Which of the following is soluble in yellow ammonium sulphide [MP PET 1994, 97] |
| A. | \[CuS\] |
| B. | \[CdS\] |
| C. | \[SnS\] |
| D. | \[PbS\] |
| Answer» D. \[PbS\] | |
| 311. |
In \[Br{{F}_{3}}\] molecule,the lone pairs occupy equatorial positions to minimize [CBSE PMT 2004] |
| A. | Lone pair- lone pair repuilsion and lone pair-bond pair repulsion |
| B. | Lone pair- lone pair repulsion only |
| C. | Lone pair- bond pair repulsion only |
| D. | Bond pair- bond pair repulsion only |
| Answer» C. Lone pair- bond pair repulsion only | |
| 312. |
The nuclear binding energy for \[Ar\](39.962384 amu) is: (given mass of proton and neutron are 1.007825 amu and 1.008665 amu respectively) [Pb.CET 2002] |
| A. | \[343.81\ MeV\] |
| B. | \[0.369096\ MeV\] |
| C. | \[931\ MeV\] |
| D. | None of these |
| Answer» B. \[0.369096\ MeV\] | |
| 313. |
Conc. \[HN{{O}_{3}}\] is added before proceeding to test for group III members. This is to [NCERT 1974] |
| A. | Oxidise any remaining \[{{H}_{2}}S\] |
| B. | Convert ferrous ion into ferric ion |
| C. | Form nitrates which give granular ppts |
| D. | Increase ionisation of ammonium hydroxide |
| Answer» C. Form nitrates which give granular ppts | |
| 314. |
The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with \[ZnS{{O}_{4}}.7{{H}_{2}}O\]. The atomic weight of M is [IIT 1991] |
| A. | 40.3 |
| B. | 36.3 |
| C. | 24.3 |
| D. | 11.3 |
| Answer» D. 11.3 | |
| 315. |
When \[C{{l}_{2}}\] water is added to a salt solution containing chloroform, chloroform layer turns violet. Salt contains [CPMT 1982] |
| A. | \[C{{l}^{-}}\] |
| B. | \[{{I}^{-}}\] |
| C. | \[NO_{3}^{-}\] |
| D. | \[{{S}^{2-}}\] |
| Answer» C. \[NO_{3}^{-}\] | |
| 316. |
Amorphous substances show A Short and long range order B Short range order C Long range order D Have no sharp M.P. |
| A. | A and C are correct |
| B. | B and C are correct |
| C. | C and D are correct |
| D. | B and D are correct |
| Answer» E. | |
| 317. |
Which of the following statements is correct for \[CsB{{r}_{3}}\]? |
| A. | It is a covalent compound. |
| B. | It contains \[C{{s}^{3+}}\] and \[B{{r}^{-}}\] ions. |
| C. | It contains \[C{{s}^{+}}\] and \[B{{r}_{3}}^{-}\] ions |
| D. | It contains \[C{{s}^{+}},\] and \[B{{r}^{-}}\] and lattice \[B{{r}_{2}}\] molecule. |
| Answer» D. It contains \[C{{s}^{+}},\] and \[B{{r}^{-}}\] and lattice \[B{{r}_{2}}\] molecule. | |
| 318. |
Heavy water \[({{D}_{2}}O)\] is [RPET/PMT 2000; CPMT 2000] |
| A. | A product of oxygen and hydrogen |
| B. | Water of mineral springs |
| C. | Water obtained by repeated distillation and condensation |
| D. | Ordinary water containing dissolved salts heavy metals |
| Answer» D. Ordinary water containing dissolved salts heavy metals | |
| 319. |
Temporary hardness may be removed from water by adding [Pb. PMT 2002] |
| A. | \[CaC{{O}_{3}}\] |
| B. | \[Ca{{(OH)}_{2}}\] |
| C. | \[CaS{{O}_{4}}\] |
| D. | HCl |
| Answer» C. \[CaS{{O}_{4}}\] | |
| 320. |
In presence of catalyst, the activation energy is lowered by 3 kcal at \[27{}^\circ C\]. Hence, the rate of reaction will increase by |
| A. | 32 times |
| B. | 243 times |
| C. | 2 times |
| D. | 148 times |
| Answer» E. | |
| 321. |
Which is used as an antifreeze [AFMC 1992] |
| A. | Glycol |
| B. | Ethyl alcohol |
| C. | Water |
| D. | Methanol |
| Answer» B. Ethyl alcohol | |
| 322. |
Given the numbers : 161cm, 0.161cm, 0.0161 cm. The number of significant figures for the three numbers are [CBSE PMT 1998] |
| A. | 3, 4 and 5 respectively |
| B. | 3, 3 and 3 respectively |
| C. | 3, 3 and 4 respectively |
| D. | 3, 4 and 4 respectively |
| Answer» C. 3, 3 and 4 respectively | |
| 323. |
The dissociation energy of \[{{H}_{2}}\] is \[430.53\text{ }kJmo{{l}^{-1}}\]. If hydrogen is dissociated by illumination with radiation of wavelength 253.7 nm the fraction of the radiant energy which will be converted into kinetic energy is given by |
| A. | 100% |
| B. | 0.0882 |
| C. | 2.22% |
| D. | 0.0122 |
| Answer» C. 2.22% | |
| 324. |
For a first-order homogeneous gaseous reaction \[A\to 2B+C,\] if the total pressure after time t was \[{{P}_{t}}\] and after long time \[(t\to \infty )\] was \[{{P}_{\infty }}\] then k in terms of \[{{P}_{t}},\,{{P}_{\infty }}\] and t is: |
| A. | \[k=\frac{2.303}{t}\log \left( \frac{{{P}_{\infty }}}{{{P}_{\infty }}-{{P}_{t}}} \right)\] |
| B. | \[k=\frac{2.303}{t}\log \left( \frac{2{{P}_{\infty }}}{{{P}_{\infty }}-{{P}_{t}}} \right)\] |
| C. | \[k=\frac{2.303}{t}\log \left( \frac{2{{P}_{\infty }}}{3\left( {{P}_{\infty }}-{{P}_{t}} \right)} \right)\] |
| D. | None of these |
| Answer» D. None of these | |
| 325. |
When \[HCl\] gas is passed through saturated solution of \[BaC{{l}_{2}}\], a white ppt. is obtained. This is due to [CPMT 1979] |
| A. | Impurities in \[BaC{{l}_{2}}\] |
| B. | Impurities in \[HCl\] |
| C. | Precipitation of \[BaC{{l}_{2}}\] |
| D. | Formation of complex |
| Answer» D. Formation of complex | |
| 326. |
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 | |
| 327. |
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. \[698.28\,oh{{m}^{-1}}\,c{{m}^{2}}\,mo{{l}^{-1}}\] | |
| 328. |
2.0 g of a sample contains mixture of \[Si{{O}_{2}}\]and\[F{{e}_{2}}{{O}_{\text{3}}}\]. On very strong heating, it leaves a residue weighing 1.96 g. The reaction responsible for loss of mass is given below.\[F{{e}_{2}}{{O}_{3}}(s)\to F{{e}_{3}}{{O}_{4}}(s)+O(g),\](unbalance equation)What is the percentage by mass of \[Si{{O}_{2}}\] in original sample? |
| A. | 100% |
| B. | 0.2 |
| C. | 0.4 |
| D. | 0.6 |
| Answer» D. 0.6 | |
| 329. |
The deficiency of vitamin \[{{B}_{1}}\] causes [CPMT 1994; MP PMT 1999; BHU 2000] |
| A. | Beri-beri |
| B. | Scurvy |
| C. | Rickets |
| D. | Anaemia |
| Answer» B. Scurvy | |
| 330. |
Enzymes with two sites are called [AIIMS 2002] |
| A. | Apoenzyme |
| B. | Holoenzyme |
| C. | Allosteric enzyme |
| D. | Conjugate enzyme |
| Answer» D. Conjugate enzyme | |
| 331. |
Depletion of ozone layer is caused by [RPMT 2002] |
| A. | Freon |
| B. | Alkane |
| C. | Gringard reagent |
| D. | All of these |
| Answer» B. Alkane | |
| 332. |
\[Xe{{O}_{4}}\] molecule is tetrahedral having: |
| A. | Two \[p\pi -d\pi \] bonds |
| B. | One \[p\pi -d\pi \] bonds |
| C. | Four \[p\pi -d\pi \] bonds |
| D. | Three \[p\pi -d\pi \] bonds |
| Answer» D. Three \[p\pi -d\pi \] bonds | |
| 333. |
According to VSEPR theory, the most probable shape of the molecule having 4 electron pairs in the outer shell of the central atom is [MP PET 1996, 2001] |
| A. | Linear |
| B. | Tetrahedral |
| C. | Hexahedral |
| D. | Octahedral |
| Answer» C. Hexahedral | |
| 334. |
The standard heat of combustion of Al is \[-\,837.8\,kJ\,mo{{l}^{-1}}\] at \[{{25}^{o}}C\]. If Al reacts with \[{{O}_{2}}\] at \[{{25}^{o}}C,\] which of the following releases 250 kcal of heat? |
| A. | The reaction of 0.624 mole of Al |
| B. | The formation of 0.624 mole of \[A{{l}_{2}}{{O}_{3}}\] |
| C. | The reaction of 0.312 mole of Al |
| D. | The formation of 0.150 mole of \[A{{l}_{2}}{{O}_{3}}\] |
| Answer» C. The reaction of 0.312 mole of Al | |
| 335. |
State which of the following statements is true? |
| A. | First law of thermodynamics is not adequate in predicting the direction of the process. |
| B. | In an exothermic reaction, the total enthalpy of the products is greater than that of reactants. |
| C. | The standard enthalpy of diamond is zero at 298K and 1 atm pressure. |
| D. | It is possible to calculate the value of \[\Delta H\] for the reaction \[{{H}_{2}}(g)+B{{r}_{2}}(\ell )\to 2HBr(g)\] from the bond enthalpy data. |
| Answer» B. In an exothermic reaction, the total enthalpy of the products is greater than that of reactants. | |
| 336. |
The heat of hydration of solution anhydrous \[CuS{{O}_{4}}\] and hydrated \[CuS{{O}_{4}}\cdot 5{{H}_{2}}O\] are - 66.5 and 11.7 kJ \[mo{{l}^{-1}}\]respectively. Calculate the heat of hydration of \[CuS{{O}_{4}}\] to \[CuS{{O}_{4}}\cdot 5{{H}_{2}}O\] |
| A. | - 78.2 kJ |
| B. | - 81.2 kJ |
| C. | - 68.2 kJ |
| D. | - 60.1 kJ |
| Answer» B. - 81.2 kJ | |
| 337. |
What is the concentration of nitrate ions if equal volumes of 0.1 M \[AgN{{O}_{3}}\] and 0.1 M \[NaCl\] are mixed together [NCERT 1981; CPMT 1983] |
| A. | 0.1 N |
| B. | 0.2 M |
| C. | 0.05 M |
| D. | 0.25 M |
| Answer» D. 0.25 M | |
| 338. |
Ethyl acetoacetate shows, which type of isomerism [Pb. CET 2003] |
| A. | Chain |
| B. | Optical |
| C. | Metamerism |
| D. | Tautomerism |
| Answer» E. | |
| 339. |
The acid that results when a base accepts a proton is called [Kerala (Med.) 2002] |
| A. | Conjugate base of the acid |
| B. | Conjugate protonated base |
| C. | Lewis base |
| D. | Conjugate acid of the base |
| E. | None of these |
| Answer» E. None of these | |
| 340. |
Which of the following is true, when components forms an ideal solution? |
| A. | \[\Delta {{H}_{m}}=\Delta {{V}_{m}}=0\] |
| B. | \[\Delta {{H}_{m}}>\Delta {{V}_{m}}\] |
| C. | \[\Delta {{H}_{m}}<\Delta {{V}_{m}}\] |
| D. | \[\Delta {{H}_{m}}=\Delta {{V}_{m}}=1\] |
| Answer» B. \[\Delta {{H}_{m}}>\Delta {{V}_{m}}\] | |
| 341. |
Which is not the use of orthoboric acid? |
| A. | As an antiseptic and eye wash. |
| B. | In glass industry. |
| C. | In glazes for pottery. |
| D. | In borax - bead test. |
| Answer» E. | |
| 342. |
Two components A and B form an ideal solution. The mole fraction of A and B in ideal solutions are \[{{X}_{A}}\] and \[{{X}_{B}},\] while that of in vapour phase, these components have their mole fractions as \[{{Y}_{A}}\] and \[{{Y}_{B}}\] then, the slope and intercept of plot of \[\frac{1}{{{Y}_{A}}}\] us \[\frac{1}{{{X}_{A}}}\] will be |
| A. | \[\frac{p_{B}^{0}}{p_{A}^{0}},\frac{p_{A}^{0}-p_{B}^{0}}{p_{A}^{0}}\] |
| B. | \[\frac{p_{B}^{0}}{p_{A}^{0}},\frac{p_{A}^{0}+p_{B}^{0}}{p_{A}^{0}}\] |
| C. | \[\frac{p_{A}^{0}}{p_{B}^{0}},\frac{p_{A}^{0}+p_{B}^{0}}{p_{A}^{0}}\] |
| D. | \[\frac{p_{A}^{0}}{p_{B}^{0}},\frac{p_{A}^{0}}{p_{A}^{0}-p_{B}^{0}}\] |
| Answer» B. \[\frac{p_{B}^{0}}{p_{A}^{0}},\frac{p_{A}^{0}+p_{B}^{0}}{p_{A}^{0}}\] | |
| 343. |
A compound contains 54.55 % carbon, 9.09% hydrogen, 36.36% oxygen. The empirical formula of this compound is: |
| A. | \[{{C}_{3}}{{H}_{5}}O\] |
| B. | \[{{C}_{4}}{{H}_{8}}{{O}_{2}}\] |
| C. | \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}O\] |
| Answer» E. | |
| 344. |
The number of water molecules in 1 litre of water is [EAMCET 1990] |
| A. | 18 |
| B. | \[18\times 1000\] |
| C. | \[{{N}_{A}}\] |
| D. | \[55.55\,{{N}_{A}}\] |
| Answer» E. | |
| 345. |
The number of sodium atoms in 2 moles of sodium ferrocyanide is [BHU 2004] |
| A. | \[12\times {{10}^{23}}\] |
| B. | \[26\times {{10}^{23}}\] |
| C. | \[34\times {{10}^{23}}\] |
| D. | \[48\times {{10}^{23}}\] |
| Answer» E. | |
| 346. |
Indicator for the titration of HCl and \[N{{a}_{2}}C{{O}_{3}}\] would be [RPMT 1999] |
| A. | \[{{K}_{4}}Fe{{(CN)}_{6}}\] |
| B. | \[{{K}_{3}}Fe{{(CN)}_{6}}\] |
| C. | Phenolphthalein |
| D. | Methyl orange |
| Answer» E. | |
| 347. |
Which of the following aqueous acid is most acidic [AMU 2000] |
| A. | HCl |
| B. | HF |
| C. | HI |
| D. | HBr |
| Answer» D. HBr | |
| 348. |
The correct order of the increasing ionic character is [MP PET 2000] |
| A. | \[BeC{{l}_{2}}<MgC{{l}_{2}}<CaC{{l}_{2}}<BaC{{l}_{2}}\] |
| B. | \[BeC{{l}_{2}}<MgC{{l}_{2}}<BaC{{l}_{2}}>CaC{{l}_{2}}\] |
| C. | \[BeC{{l}_{2}}<BaC{{l}_{2}}<MgC{{l}_{2}}<CaC{{l}_{2}}\] |
| D. | \[BaC{{l}_{2}}<CaC{{l}_{2}}<MgC{{l}_{2}}<BeC{{l}_{2}}\] |
| Answer» B. \[BeC{{l}_{2}}<MgC{{l}_{2}}<BaC{{l}_{2}}>CaC{{l}_{2}}\] | |
| 349. |
The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately |
| A. | \[{{10}^{-31}}\] |
| B. | \[{{10}^{-16}}\] |
| C. | \[{{10}^{-25}}\] |
| D. | \[{{10}^{-33}}\] |
| Answer» E. | |
| 350. |
The total number of possible isomeric trimethyl benzene is [MP PET 1997] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |