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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.
| 10301. |
A mixture of boric acid with ethy1 alcohol burns with green edged flame due to the formation of |
| A. | Ethy 1 borax |
| B. | Ethy1 borate |
| C. | Methy1 Borax |
| D. | Methy1 borate |
| Answer» C. Methy1 Borax | |
| 10302. |
\[C{{a}_{2}}{{B}_{6}}{{O}_{11}}+2N{{a}_{2}}C{{O}_{3}}\to X-2CaC{{O}_{3}}+2NaB{{O}_{2}}.\]The compound X in the above reaction is |
| A. | \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\] |
| B. | \[HB{{O}_{2}}\] |
| C. | \[{{H}_{3}}B{{O}_{3}}\] |
| D. | \[{{H}_{2}}{{B}_{4}}{{O}_{7}}\] |
| Answer» B. \[HB{{O}_{2}}\] | |
| 10303. |
Which one below is a pseudohalide [AIIMS 1982] |
| A. | \[C{{N}^{-}}\] |
| B. | \[ICl\] |
| C. | \[I{{F}_{5}}\] |
| D. | \[I_{3}^{-}\] |
| Answer» B. \[ICl\] | |
| 10304. |
The mixture of concentrated HCl and \[HN{{O}_{3}}\] made in 3 : 1 ratio contains [AIIMS 2003] |
| A. | \[Cl{{O}_{2}}\] |
| B. | NOCl |
| C. | \[NC{{l}_{3}}\] |
| D. | \[{{N}_{2}}{{O}_{4}}\] |
| Answer» C. \[NC{{l}_{3}}\] | |
| 10305. |
Which of the following halogen does not exhibit positive oxidation state in its compounds [EAMCET 1997; AIIMS 2000] |
| A. | \[Cl\] |
| B. | \[Br\] |
| C. | \[I\] |
| D. | \[F\] |
| Answer» E. | |
| 10306. |
Fluorine is prepared by |
| A. | Oxidation of \[HF\] |
| B. | Electrolysis of \[KF\] |
| C. | Electrolysis of fused \[KH{{F}_{2}}\] |
| D. | Decomposition of \[Hg{{F}_{2}}\] |
| Answer» D. Decomposition of \[Hg{{F}_{2}}\] | |
| 10307. |
In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with [CBSE PMT 1992; MP PMT 2001; BHU 2002; JIPMER 2002] |
| A. | \[C{{O}_{2}}\] |
| B. | \[C{{l}_{2}}\] |
| C. | \[{{I}_{2}}\] |
| D. | \[S{{O}_{2}}\] |
| Answer» C. \[{{I}_{2}}\] | |
| 10308. |
Which statement is not true [MP PET 2000] |
| A. | \[Ni\,{{(CO)}_{4}}\] is diamagnetic |
| B. | \[C{{O}_{2}}\] is a stronger Lewis acid than \[Sn{{(OH)}_{2}}\] |
| C. | Graphite conducts electricity whereas diamond does not |
| D. | \[CC{{l}_{4}}\] is hydrolysed whereas \[BC{{l}_{3}}\] is inert |
| Answer» E. | |
| 10309. |
Bleaching action of chlorine is due to [Bihar CEE 1995] |
| A. | Oxidation |
| B. | Reduction |
| C. | Hydrolysis |
| D. | Its acidic nature |
| Answer» B. Reduction | |
| 10310. |
\[MnO_{4}^{-}\] is of intense pink colour, though Mn is in (+7) oxidation state. It is due to |
| A. | oxygen gives colour to it |
| B. | charge transfer when Mn gives its electron to oxygen |
| C. | charge transfer when oxygen gives its electron to mb making it Mn(+VI) hence coloured |
| D. | none is correct |
| Answer» D. none is correct | |
| 10311. |
AgCl and NaCl are colourless NaBr and Nal are also colourless but AgBr and AgI are coloured. This is due to |
| A. | \[A{{g}^{+}}\] has half-filled d-orbital |
| B. | \[A{{g}^{+}}\]polarises \[B{{r}^{-}}\] and \[{{I}^{-}}\] |
| C. | \[A{{g}^{+}}\]depolarises \[B{{r}^{-}}\] and \[{{I}^{-}}\] |
| D. | None is correct |
| Answer» C. \[A{{g}^{+}}\]depolarises \[B{{r}^{-}}\] and \[{{I}^{-}}\] | |
| 10312. |
Across the lanthanide series, the basicity of the lanthanoid hydroxides |
| A. | increases |
| B. | decreases |
| C. | first increases and then decreases |
| D. | does not change |
| Answer» C. first increases and then decreases | |
| 10313. |
Collin's reagent is [RPMT 2002] |
| A. | \[MN{{O}_{2}}/HCl\] |
| B. | \[MN{{O}_{4}}/{{C}_{5}}{{H}_{5}}N\] |
| C. | \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}/{{H}_{2}}S{{O}_{4}}\] |
| D. | \[C{{r}_{2}}{{O}_{3}}/2{{C}_{5}}{{H}_{5}}N\] |
| Answer» E. | |
| 10314. |
Cerium \[(Z=58)\] is an important member of the lanthanoids. Which of the following statements about cerium is incorrect [AIEEE 2004] |
| A. | The +4 oxidation state of cerium is not known in solutions |
| B. | The +3 oxidation state of cerium is more stable than the +4 oxidation state |
| C. | The common oxidation states of cerium are +3 and +4 |
| D. | Cerium (IV) acts as an oxidizing agent |
| Answer» B. The +3 oxidation state of cerium is more stable than the +4 oxidation state | |
| 10315. |
For a reaction, the rate constant is \[2.34{{\sec }^{-1}}\]. The half-life period for the reaction is |
| A. | 0.30 sec |
| B. | 0.60 sec |
| C. | 3.3 sec |
| D. | Data is insufficient |
| Answer» B. 0.60 sec | |
| 10316. |
A radioactive isotope decays at such a rate that after 192 minutes only \[1/16\] of the original amount remains. The half-life of the radioactive isotope is [Kerala CET 2004] |
| A. | 32 min |
| B. | 48 min |
| C. | 12 min |
| D. | 24 min |
| Answer» C. 12 min | |
| 10317. |
The decay constant of \[R{{a}^{226}}\] is \[1.37\times {{10}^{-11}}{{\sec }^{-1}}\]. A sample of \[R{{a}^{226}}\] having an activity of 1.5 millicurie will contain ...... atoms |
| A. | \[4.1\times {{10}^{18}}\] |
| B. | \[3.7\times {{10}^{17}}\] |
| C. | \[2.05\times {{10}^{15}}\] |
| D. | \[4.7\times {{10}^{10}}\] |
| Answer» B. \[3.7\times {{10}^{17}}\] | |
| 10318. |
If \[{{U}^{235}}\] is bombarded with neutrons, atom will split into [CPMT 1981] |
| A. | Sr + Pb |
| B. | Cs + Rb |
| C. | Kr + Cd |
| D. | Ba + Kr |
| Answer» E. | |
| 10319. |
The half-life of \[_{92}{{U}^{238}}\] is \[4.5\times {{10}^{9}}\] years. After how many years, the amount of \[_{92}{{U}^{238}}\] will be reduced to half of its present amount [CPMT 1990; MP PET 1999] |
| A. | \[9.0\times {{10}^{9}}\] years |
| B. | \[13.5\times {{10}^{9}}\] years |
| C. | \[4.5\times {{10}^{9}}\] years |
| D. | \[4.5\times {{10}^{4.5}}\] years |
| Answer» D. \[4.5\times {{10}^{4.5}}\] years | |
| 10320. |
If 3/4 quantity of a radioactive element disintegrates in two hours, its half-life would be [MP PMT 1989; CPMT 1984] |
| A. | 1 hour |
| B. | 45 minutes |
| C. | 30 minutes |
| D. | 15 minutes |
| Answer» B. 45 minutes | |
| 10321. |
During a negative \[\beta \]-decay [MNR 1990; IIT 1985] |
| A. | An atomic electron is ejected |
| B. | An electron which is already present within the nucleus is ejected |
| C. | A neutron in the nucleus decays emitting an electron |
| D. | A part of the binding energy of the nucleus is converted into an electron |
| Answer» D. A part of the binding energy of the nucleus is converted into an electron | |
| 10322. |
The half-life period of a radioactive substance is 8 years. After 16 years, the mass of the substance will reduce from starting \[16.0g\] to [MP PMT 1999] |
| A. | \[8.0\,g\] |
| B. | \[6.0\,g\] |
| C. | \[4.0\,g\] |
| D. | \[2.0\,g\] |
| Answer» D. \[2.0\,g\] | |
| 10323. |
Calculate mass defect in the following reaction \[_{1}{{H}^{2}}{{+}_{1}}{{H}^{3}}{{\to }_{1}}H{{e}^{4}}{{+}_{0}}{{n}^{1}}\] (Given : mass \[{{H}^{2}}=2.014,\,{{H}^{3}}=3.016,\,He=4.004,\] \[n=1.008\,amu\]) [Kerala CET 2005] |
| A. | 0.018 amu |
| B. | 0.18 amu |
| C. | 0.0018 amu |
| D. | 1.8 amu |
| Answer» B. 0.18 amu | |
| 10324. |
What happens when a-particle is emitted [CBSE PMT 1989; JIPMER 2002] |
| A. | Mass number decreases by 12 unit, atomic number decreases by 4 unit |
| B. | Mass number decreases by 4 unit, atomic number decreases by 2 unit |
| C. | Only mass number decreases |
| D. | Only atomic number decreases |
| Answer» C. Only mass number decreases | |
| 10325. |
Which is not emitted by radioactive substance [AIIMS 1997] |
| A. | \[\alpha \]-rays |
| B. | \[\beta \]-rays |
| C. | Positron |
| D. | Proton |
| Answer» E. | |
| 10326. |
Of the following radiations, the one most easily stopped by air is [MP PMT 1991] |
| A. | \[\alpha \]-rays |
| B. | \[\beta \]-rays |
| C. | \[\gamma \]-rays |
| D. | X-rays |
| Answer» B. \[\beta \]-rays | |
| 10327. |
X-rays are produced due to [JIPMER 2002] |
| A. | Bombarding of electrons on solids |
| B. | Bombarding of a-particle on solids |
| C. | Bombarding of g-rays on solids |
| D. | Bombarding of neutron on solids |
| Answer» B. Bombarding of a-particle on solids | |
| 10328. |
Radioactivity was discovered by [CPMT 1983, 88; DPMT 1982; AMU 1983; MADT Bihar 1982] |
| A. | Henry Becquerel |
| B. | Rutherford |
| C. | J. J. Thomson |
| D. | Madam Curie |
| Answer» B. Rutherford | |
| 10329. |
\[_{Z}{{X}^{M}}{{+}_{2}}H{{e}^{4}}{{\to }_{15}}{{P}^{30}}{{+}_{0}}{{n}^{1}}\]. Then [KCET 2002] |
| A. | \[Z=12,\,\,M=27\] |
| B. | \[Z=13,\,\,M=27\] |
| C. | \[Z=12,\,\,M=17\] |
| D. | \[Z=13,\,\,M=28\] |
| Answer» C. \[Z=12,\,\,M=17\] | |
| 10330. |
Nuclear reactivity of Na and \[N{{a}^{+}}\] is same because both have [Pb. PMT 2000] |
| A. | Same electron and proton |
| B. | Same proton and same neutron |
| C. | Different electron and proton |
| D. | Different proton and neutron |
| Answer» C. Different electron and proton | |
| 10331. |
In the reaction, \[Po\xrightarrow{-\alpha }Pb\xrightarrow{-\beta }Bi,\,\] if Bi, belongs to group 15, to which Po belongs [DCE 2000] |
| A. | 14 |
| B. | 15 |
| C. | 13 |
| D. | 16 |
| Answer» E. | |
| 10332. |
Which of the following atomic mass of uranium is the most radioactive [AFMC 1997] |
| A. | 238 |
| B. | 235 |
| C. | 226 |
| D. | 248 |
| Answer» C. 226 | |
| 10333. |
The positron is [AFMC 1997] |
| A. | \[_{-1}{{e}^{0}}\] |
| B. | \[_{+1}{{e}^{0}}\] |
| C. | \[_{1}{{H}^{1}}\] |
| D. | \[_{0}{{n}^{1}}\] |
| Answer» C. \[_{1}{{H}^{1}}\] | |
| 10334. |
Nuclear energy is based on the conversion of |
| A. | Protons into neutrons |
| B. | Mass into energy |
| C. | Neutrons into protons |
| D. | Uranium into radium |
| Answer» C. Neutrons into protons | |
| 10335. |
Which one of the following nuclear transformation is (n, p ) type [AIIMS 1980, 83] |
| A. | \[_{3}L{{i}^{7}}+{{\,}_{1}}{{H}^{1}}\xrightarrow{{}}{{\,}_{4}}B{{e}^{7}}+{{\,}_{0}}{{n}^{1}}\] |
| B. | \[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\xrightarrow{{}}{{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\] |
| C. | \[_{83}B{{i}^{209}}+{{\,}_{1}}{{H}^{2}}\xrightarrow{{}}{{\,}_{84}}P{{o}^{210}}+{{\,}_{0}}{{n}^{1}}\] |
| D. | \[_{21}S{{c}^{45}}+{{\,}_{0}}{{n}^{1}}\xrightarrow{{}}{{\,}_{20}}C{{a}^{45}}+{{\,}_{1}}{{H}^{1}}\] |
| Answer» E. | |
| 10336. |
Stable nuclides are those whose n/p ratio is [MP PMT 1993] |
| A. | \[n/p=1\] |
| B. | \[n/p=2\] |
| C. | \[n/p>1\] |
| D. | \[n/p<1\] |
| Answer» B. \[n/p=2\] | |
| 10337. |
On comparing chemical reactivity of \[{{C}^{12}}\] and \[{{C}^{14}}\], it is revealed that |
| A. | \[{{C}^{12}}\] is more reactive |
| B. | \[{{C}^{14}}\] is more reactive |
| C. | Both are inactive |
| D. | Both are equally active |
| Answer» C. Both are inactive | |
| 10338. |
Select the correct statement(s) |
| A. | A hydrophilic colloid is a colloid is which there is a strong attraction between the dispersed phase and water |
| B. | A hydrophobic colloid is a colloid in which there is a lack of attraction between the dispersed phase and water |
| C. | Hydrophobic sols are often formed when a solid crystallizes rapidly from a chemical reaction or a supersaturated solution |
| D. | All of the above |
| Answer» E. | |
| 10339. |
In Langmuir?s model of adsorption of gas on a solid surface |
| A. | The mass of gas striking a given area of surface is independent of the pressure of the gas |
| B. | The rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered |
| C. | The adsorption at a single site on the surface may involve multiple molecules at the same time |
| D. | The mass of the gas striking a given area of surface is proportional to the pressure of the gas |
| Answer» E. | |
| 10340. |
Bredig's are method cannot be used to prepare colloidal solution of which of the following metal? |
| A. | pt |
| B. | Fe |
| C. | Ag |
| D. | Au |
| Answer» C. Ag | |
| 10341. |
Platinised asbestos helps in the formation of \[S{{O}_{3}}\] form \[S{{O}_{2}}\] and \[{{O}_{2}}\]. But, if even a small amount of \[A{{s}_{2}}{{O}_{3}}\] is present the platinised asbestos does not help in the formation of \[S{{O}_{3}}\]. \[A{{s}_{2}}{{O}_{3}}\] acts here as [MP PMT 1997] |
| A. | A positive catalyst |
| B. | A negative catalyst |
| C. | An auto catalyst |
| D. | A poison |
| Answer» E. | |
| 10342. |
A colloidal system in which gas bubbles are dispersed in a liquid is known as [MP PMT 1993] |
| A. | Foam |
| B. | Sol |
| C. | Aerosol |
| D. | Emulsion |
| Answer» B. Sol | |
| 10343. |
In which of the following processes, platinum is used as a catalyst [NCERT 1978, 79] |
| A. | Oxidation of ammonia to form nitric acid |
| B. | Hardening of oils |
| C. | Production of synthetic rubber |
| D. | Synthesis of methanol |
| Answer» B. Hardening of oils | |
| 10344. |
\[_{6}{{C}^{11}}\] and \[_{5}{{B}^{11}}\] are referred as [NCERT 1978] |
| A. | Nuclear isomers |
| B. | Isobars |
| C. | Isotopes |
| D. | Fission products |
| Answer» C. Isotopes | |
| 10345. |
Colour of colloidal solution is due to [CPMT 1996] |
| A. | Different size of colloidal particles |
| B. | Due to formation of complex |
| C. | Due to formation of hydrated crystal |
| D. | None of these |
| Answer» B. Due to formation of complex | |
| 10346. |
Which one of the following pairs represents isobars [CPMT 1988] |
| A. | \[_{2}^{3}He\] and \[_{2}^{4}He\] |
| B. | \[_{12}^{24}Mg\] and \[_{12}^{25}Mg\] |
| C. | \[_{19}^{40}K\] and \[_{20}^{40}Ca\] |
| D. | \[_{19}^{39}K\] and \[_{19}^{40}K\] |
| Answer» D. \[_{19}^{39}K\] and \[_{19}^{40}K\] | |
| 10347. |
The possibility of finding an electron in an orbital was conceived by [MP PMT 1994] |
| A. | Rutherford |
| B. | Bohr |
| C. | Heisenberg |
| D. | Schrodinger |
| Answer» E. | |
| 10348. |
Which quantum number is not related with Schrodinger equation [RPMT 2002] |
| A. | Principal |
| B. | Azimuthal |
| C. | Magnetic |
| D. | Spin |
| Answer» E. | |
| 10349. |
In Heisenberg's uncertainty equation \[\Delta x\times \Delta p\ge \frac{h}{4\pi }\]; \[\Delta p\] stands for |
| A. | Uncertainty in energy |
| B. | Uncertainty in velocity |
| C. | Uncertainty in momentum |
| D. | Uncertainty in mass |
| Answer» D. Uncertainty in mass | |
| 10350. |
Uncertainty principle gave the concept of |
| A. | Probability |
| B. | An orbital |
| C. | Physical meaning of \[\Psi \] the \[{{\Psi }^{2}}\] |
| D. | All the above |
| Answer» B. An orbital | |