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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.
| 8301. |
Isoelectronic species are [EAMCET 1989] |
| A. | \[{{K}^{+}},\,C{{l}^{-}}\] |
| B. | \[N{{a}^{+}},\,C{{l}^{-}}\] |
| C. | \[Na,\,Ar\] |
| D. | \[N{{a}^{+}},\,Ar\] |
| Answer» B. \[N{{a}^{+}},\,C{{l}^{-}}\] | |
| 8302. |
If \[S\] and \[{{K}_{sp}}\] are respectively solubility and solubility product of a sparingly soluble binary electrolyte, then [CPMT 1988; MP PMT 1999] |
| A. | \[S={{K}_{sp}}\] |
| B. | \[S=K_{sp}^{2}\] |
| C. | \[S=\sqrt{{{K}_{sp}}}\] |
| D. | \[S=\frac{1}{2}{{K}_{sp}}\] |
| Answer» D. \[S=\frac{1}{2}{{K}_{sp}}\] | |
| 8303. |
Which of the following is not used to construct salt bridge [MP PET 2003] |
| A. | \[C{{H}_{3}}COOK\] |
| B. | \[KCl\] |
| C. | \[N{{H}_{4}}N{{O}_{3}}\] |
| D. | \[KN{{O}_{3}}\] |
| Answer» B. \[KCl\] | |
| 8304. |
An atom which has lost one electron would be [CPMT 1986] |
| A. | Negatively charged |
| B. | Positively charged |
| C. | Electrically neutral |
| D. | Carry double positive charge |
| Answer» D. Carry double positive charge | |
| 8305. |
If hydrogen electrode dipped in 2 solution of \[pH=3\] and \[pH=6\] and salt bridge is connected the e.m.f. of resulting cell is [DPMT 2005] |
| A. | 0.177 V |
| B. | 0.3 V |
| C. | 0.052 V |
| D. | 0.104 V |
| Answer» B. 0.3 V | |
| 8306. |
Which of the following is known as hydronium ion [NCERT 1976] |
| A. | \[{{H}^{+}}\] |
| B. | \[{{H}_{2}}{{O}^{+}}\] |
| C. | \[{{H}_{3}}{{O}^{+}}\] |
| D. | \[{{H}_{2}}O_{2}^{+}\] |
| Answer» D. \[{{H}_{2}}O_{2}^{+}\] | |
| 8307. |
In laboratory silicon can be prepared by the reaction [Pb. PMT 1999] |
| A. | By heating carbon in electric furnace |
| B. | By heating potassium with potassium dichromate |
| C. | Silica with magnesium |
| D. | None of these |
| Answer» D. None of these | |
| 8308. |
Which of the following is an example of ketohexose [Orissa JEE 2003] |
| A. | Mannose |
| B. | Galactose |
| C. | Maltose |
| D. | Fructose |
| Answer» E. | |
| 8309. |
Coaltar is main source of [DPMT 1984] |
| A. | Aromatic compounds |
| B. | Aliphatic compounds |
| C. | Cycloalkanes |
| D. | Heterocyclic compounds |
| Answer» B. Aliphatic compounds | |
| 8310. |
The mass of \[BaC{{O}_{3}}\] produced when excess \[C{{O}_{2}}\] is bubbled through a solution of 0.205 mol \[Ba{{(OH)}_{2}}\] is [UPSEAT 2004] |
| A. | 81 g |
| B. | 40.5 g |
| C. | 20.25 g |
| D. | 162 g |
| Answer» C. 20.25 g | |
| 8311. |
Calculate \[\Delta G{}^\circ\] for conversion of oxygen to ozone \[3/2\ {{O}_{2}}(g)\to {{O}_{3}}(g)\] at 298 K, if \[{{K}_{p}}\] for this conversion is \[2.47\times {{10}^{-29}}\] [DPMT 2004] |
| A. | \[163\ kJ\ mo{{l}^{-1}}\] |
| B. | \[2.4\times {{10}^{2}}\ kJ\ mo{{l}^{-1}}\] |
| C. | \[1.63\ kJ\ mo{{l}^{-1}}\] |
| D. | \[2.38\times {{10}^{6}}\ kJ\ mo{{l}^{-1}}\] |
| Answer» B. \[2.4\times {{10}^{2}}\ kJ\ mo{{l}^{-1}}\] | |
| 8312. |
The solubility product of \[PbC{{l}_{2}}\] at \[{{20}^{o}}C\] is \[1.5\times {{10}^{-4}}.\] Calculate the solubility [Bihar CEE 1995; BHU 2002] |
| A. | \[3.75\times {{10}^{-4}}\] |
| B. | \[3.34\times {{10}^{-2}}\] |
| C. | \[3.34\times {{10}^{2}}\] |
| D. | None of these |
| Answer» C. \[3.34\times {{10}^{2}}\] | |
| 8313. |
Amide group is present in |
| A. | Lipids |
| B. | Carbohydrates |
| C. | Amino acids |
| D. | Proteins |
| Answer» E. | |
| 8314. |
When nuclear energy is intended to be harnessed for generation of electricity, potentially destructive neutron released in a nuclear reactor are absorbed by [MH CET 2001] |
| A. | Long rods of Cd |
| B. | Heavy water |
| C. | Cubical blocks of steel |
| D. | Both A and C |
| Answer» B. Heavy water | |
| 8315. |
In which of the following reactions there is no change in valency [NCERT 1974; CPMT 1978] |
| A. | \[4KCl{{O}_{3}}\,\to \,3KCl{{O}_{4}}+KCl\] |
| B. | \[C{{l}_{2}}\] |
| C. | \[Ba{{O}_{2}}+{{H}_{2}}S{{O}_{4}}\,\to \,\,BaS{{O}_{4}}+{{H}_{2}}{{O}_{2}}\] |
| D. | \[2BaO+{{O}_{2}}\,\to \,2Ba{{O}_{2}}\] |
| Answer» D. \[2BaO+{{O}_{2}}\,\to \,2Ba{{O}_{2}}\] | |
| 8316. |
The solubility product of a sparingly soluble salt \[A{{X}_{2}}\]is \[3.2\times {{10}^{-11}}\]. Its solubility (in moles / litres) is [CBSE PMT 2004] |
| A. | \[2\times {{10}^{-4}}\] |
| B. | \[4\times {{10}^{-4}}\] |
| C. | \[5.6\times {{10}^{-6}}\] |
| D. | \[3.1\times {{10}^{-4}}\] |
| Answer» B. \[4\times {{10}^{-4}}\] | |
| 8317. |
The compound insoluble in water is [AIIMS 2004] |
| A. | Mercurous nitrate |
| B. | Mercuric nitrate |
| C. | Mercurous chloride |
| D. | Mercurous perchlorate |
| Answer» D. Mercurous perchlorate | |
| 8318. |
The strength of an acid depends on its tendency to [MP PET 1996] |
| A. | Accept protons |
| B. | Donate protons |
| C. | Accept electrons |
| D. | Donate electrons |
| Answer» C. Accept electrons | |
| 8319. |
The number of molecules in 4.25 g of ammonia are [Pb. CET 2000] |
| A. | \[0.5\times {{10}^{23}}\] |
| B. | \[1.5\times {{10}^{23}}\] |
| C. | \[3.5\times {{10}^{23}}\] |
| D. | \[1.8\times {{10}^{32}}\] |
| Answer» C. \[3.5\times {{10}^{23}}\] | |
| 8320. |
Fog is a colloidal solution of [J & K 2005] |
| A. | Solid in gas |
| B. | Liquid in gas |
| C. | Gas in liquid |
| D. | Gas in solid |
| Answer» C. Gas in liquid | |
| 8321. |
\[ZnO.CoO\] is called |
| A. | Cobalt zincate |
| B. | Rinman's green |
| C. | Both A and B |
| D. | None of these |
| Answer» D. None of these | |
| 8322. |
The strongest Lewis base in the following [MP PET/PMT 1988] |
| A. | \[C{{H}_{3}}^{-}\] |
| B. | \[{{F}^{-}}\] |
| C. | \[N{{H}_{2}}^{-}\] |
| D. | \[O{{H}^{-}}\] |
| Answer» B. \[{{F}^{-}}\] | |
| 8323. |
When ethyl iodide and propyl iodide react with Na in the presence of ether, they form [BHU 1997] |
| A. | One alkane |
| B. | Two alkanes |
| C. | Four alkanes |
| D. | Three alkanes |
| Answer» E. | |
| 8324. |
Starting from radium, the radioactive disintegration process terminates when the following is obtained [CPMT 1979] |
| A. | Lead |
| B. | Radon |
| C. | Radium A |
| D. | Radium B |
| Answer» B. Radon | |
| 8325. |
Which of the following salts when dissolved in water will get hydrolysed [MNR 1985; CPMT 1989; CBSE PMT 1989; MP PET 1999] |
| A. | \[NaCl\] |
| B. | \[N{{H}_{4}}Cl\] |
| C. | \[KCl\] |
| D. | \[N{{a}_{2}}S{{O}_{4}}\] |
| Answer» C. \[KCl\] | |
| 8326. |
Baking soda is [RPMT 2000] |
| A. | Basic salt |
| B. | Acidic salt |
| C. | Complex salt |
| D. | Double salt |
| Answer» C. Complex salt | |
| 8327. |
In the preparation of alkanes; a concentrated aqueous solution of sodium or potassium salts of saturated carboxylic acid are subjected to [CPMT 1985; MP PET 1999] |
| A. | Hydrolysis |
| B. | Oxidation |
| C. | Hydrogenation |
| D. | Electrolysis |
| Answer» E. | |
| 8328. |
Which is false [J & K 2005] |
| A. | Glucose is a disaccharide |
| B. | Starch is a polysaccharide |
| C. | Glucose and fructose are not anomers |
| D. | Invert sugar consists of glucose and fructose |
| Answer» B. Starch is a polysaccharide | |
| 8329. |
Which is a Lewis base [CPMT 1988; JEE Orissa 2004] |
| A. | \[{{B}_{2}}{{H}_{6}}\] |
| B. | \[LiAl{{H}_{4}}\] |
| C. | \[Al{{H}_{3}}\] |
| D. | \[N{{H}_{3}}\] |
| Answer» E. | |
| 8330. |
Which of the following has maximum stability [AIIMS 2001] |
| A. | \[\overset{+}{\mathop{C}}\,{{H}_{3}}\] |
| B. | \[C{{H}_{3}}-\overset{H}{\mathop{\overset{|}{\mathop{\underset{+}{\mathop{C}}\,}}\,}}\,-H\] |
| C. | \[C{{H}_{3}}-\overset{H}{\mathop{\overset{|}{\mathop{\underset{+}{\mathop{C}}\,}}\,}}\,-C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{+}{\mathop{C}}\,\,\,\,-\,\,\,}}\,}}\,C{{H}_{3}}\] |
| Answer» E. | |
| 8331. |
When 100 ml of 1M \[NaOH\] solution is mixed with 10 ml of 10 M \[{{H}_{2}}S{{O}_{4}},\] the resulting mixture will be [AMU 2002] |
| A. | Acidic |
| B. | Alkaline |
| C. | Neutral |
| D. | Strongly alkaline |
| Answer» B. Alkaline | |
| 8332. |
Which of the following is not lewis base [EAMCET 1975; RPMT 2002] |
| A. | \[N{{H}_{3}}\] |
| B. | \[P{{H}_{3}}\] |
| C. | \[{{(C{{H}_{3}})}_{3}}N\] |
| D. | \[H{{N}_{3}}\] |
| Answer» E. | |
| 8333. |
The electrodes of a conductivity cell are \[3\,cm\] apart and have a cross-sectional area of \[4\,c{{m}^{2}}\]. The cell constant of the cell (in \[c{{m}^{-1}}\]) is |
| A. | \[4\times 3\] |
| B. | \[4/3\] |
| C. | \[3/4\] |
| D. | \[9/4\] |
| Answer» D. \[9/4\] | |
| 8334. |
The equation \[_{3}L{{i}^{6}}{{+}_{1}}{{H}^{2}}\xrightarrow{{}}{{2}_{2}}H{{e}^{4}}+\] energy represents |
| A. | Synthesis of helium |
| B. | Transmutation of element |
| C. | Fusion reaction |
| D. | Nuclear fission |
| Answer» D. Nuclear fission | |
| 8335. |
Extraction of lead by reduction methods is done by [AMU 2000] |
| A. | Adding more galena into reverberatory furnace |
| B. | Adding more lead sulphate into reverberatory furnace |
| C. | Adding more galena and coke into the reverberatory furnace |
| D. | Self reduction of oxide from sulphide present in the furnace |
| Answer» B. Adding more lead sulphate into reverberatory furnace | |
| 8336. |
When a slow neutron goes sufficiently close to a \[{{U}^{235}}\] nucleus, then the process which takes place is [AFMC 2000] |
| A. | Fusion of \[{{U}^{235}}\] |
| B. | Fission of \[{{U}^{235}}\] |
| C. | Fusion of neutron |
| D. | First A then B |
| Answer» C. Fusion of neutron | |
| 8337. |
\[{{C}_{6}}{{H}_{6}}\underset{{{H}_{2}}S{{O}_{4}}}{\mathop{\xrightarrow{HN{{O}_{3}}}}}\,X\underset{FeC{{l}_{3}}}{\mathop{\xrightarrow{C{{l}_{2}}}}}\,Y\]. In the above sequence Y is [AIIMS 1999] |
| A. | 1-nitrochloro benzene |
| B. | 3-nitrochlorobenzene |
| C. | 4-nitrochlorobenzene |
| D. | 1,2-nitrochlorobenzene |
| Answer» C. 4-nitrochlorobenzene | |
| 8338. |
Assuming fully decomposed, the volume of \[C{{O}_{2}}\]released at STP on heating 9.85g of \[BaC{{O}_{3}}\](Atomic mass of Ba=137) will be [CBSE PMT 2000] |
| A. | 0.84 L |
| B. | 2.24 L |
| C. | 4.06 L |
| D. | 1.12 L |
| Answer» E. | |
| 8339. |
On addition of one ml solution of \[10%NaCl\] to 10 ml gold sol in the presence of 0.25 gm of starch, the coagulation is just prevented. Starch has the following gold number [MP PET/PMT 1988] |
| A. | 0.025 |
| B. | 0.25 |
| C. | 0.5 |
| D. | 250 |
| Answer» E. | |
| 8340. |
Existence of positively charged nucleus was established by [CBSE PMT 1991] |
| A. | Positive ray analysis |
| B. | \[\alpha \]-ray scattering experiments |
| C. | X-ray analysis |
| D. | Discharge tube experiments |
| Answer» C. X-ray analysis | |
| 8341. |
The formation of alkene from alkyl halide is an example of [CPMT 1983; AMU 1982; Pb. CET 1986] |
| A. | Addition |
| B. | Elimination |
| C. | Substitution |
| D. | A and C |
| Answer» C. Substitution | |
| 8342. |
The trace metal present in insulin is [KCET 1991] |
| A. | Iron |
| B. | Cobalt |
| C. | Zinc |
| D. | Manganese |
| Answer» D. Manganese | |
| 8343. |
The \[\Delta S\] for the vaporisation of 1 mol of water is 88.3 J/mole K. The value of \[\Delta S\] for the condensation of 1 mol of vapour will be |
| A. | 88.3 J/mol K |
| B. | \[{{(88.3)}^{2}}\] J/mol K |
| C. | ? 88.3 J/mol K |
| D. | \[\frac{1}{88.3}\] J/mol K |
| Answer» D. \[\frac{1}{88.3}\] J/mol K | |
| 8344. |
The only cations present in a slightly acidic solution are \[F{{e}^{3+}},\ Z{{n}^{2+}}\] and \[C{{u}^{2+}}\]. The reagent that when added in excess to this solution would identify and separate \[F{{e}^{3+}}\] in one step is [IIT 1997] |
| A. | 2M HCl |
| B. | \[6M\ N{{H}_{3}}\] |
| C. | \[6M\ NaOH\] |
| D. | \[{{H}_{2}}S\] gas |
| Answer» E. | |
| 8345. |
If \[{{K}_{sp}}\] for \[HgS{{O}_{4}}\] is \[6.4\times {{10}^{-5}},\] then solubility of the salt is [AFMC 1997; KCET 2000; CPMT 2000; JIPMER 2001] |
| A. | \[8\times {{10}^{-3}}\] |
| B. | \[8\times {{10}^{-6}}\] |
| C. | \[6.4\times {{10}^{-5}}\] |
| D. | \[6.4\times {{10}^{-3}}\] |
| Answer» B. \[8\times {{10}^{-6}}\] | |
| 8346. |
To synthesize the unsymmetrical alkyne \[C{{H}_{3}}-C\equiv C-C{{H}_{2}}-C{{H}_{3}}\] the reagents needed would be |
| A. | Ethene, iodoethane, iodomethane and potassium hydroxide |
| B. | Acetaldehyde, 1-bromopropane and conc. \[{{H}_{2}}S{{O}_{4}}\] |
| C. | 1, 2-dichloroethane, 1-propanol and alcoholic potassium hydroxide |
| D. | Ethyne, iodomethane, iodoethane and sodamide |
| Answer» E. | |
| 8347. |
Any series of operations so carried out that at the end, the system is back to its initial state is called |
| A. | Boyle's cycle |
| B. | Reversible process |
| C. | Adiabatic process |
| D. | Cyclic process |
| Answer» E. | |
| 8348. |
In acidic medium one mole of \[MnO_{4}^{-}\] accepts how many moles of electrons in a redox process? [MP PET/PMT 1998] |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 8349. |
If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will [AIEEE 2005] |
| A. | Decrease twice |
| B. | Increase two fold |
| C. | Remain unchanged |
| D. | Be a function of the molecular mass of the substance |
| Answer» D. Be a function of the molecular mass of the substance | |
| 8350. |
The highest boiling point is expected for [DEC. 2003] |
| A. | \[n-\]butane |
| B. | iso-octane |
| C. | \[n-\]octane |
| D. | 2,2,3,3-tetramethyl butane |
| Answer» D. 2,2,3,3-tetramethyl butane | |