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.
| 10401. |
The orbital with maximum energy is [CPMT 2002] |
| A. | 3d |
| B. | 5p |
| C. | 4s |
| D. | 6d |
| Answer» E. | |
| 10402. |
Electron enters the sub-shell for which \[(n+l)\] value is minimum. This is enunciated as [RPMT 2000] |
| A. | Hund?s rule |
| B. | Aufbau principle |
| C. | Heisenberg uncertainty principle |
| D. | Pauli?s exclusion principle |
| Answer» C. Heisenberg uncertainty principle | |
| 10403. |
Energy of atomic orbitals in a particular shell is in the order [AFMC 1990] |
| A. | \[s<p<d<f\] |
| B. | \[s>p>d>f\] |
| C. | \[p<d<f<s\] |
| D. | \[f>d>s>p\] |
| Answer» B. \[s>p>d>f\] | |
| 10404. |
Which of the following has the least energy |
| A. | \[2p\] |
| B. | \[3p\] |
| C. | \[2s\] |
| D. | \[4d\] |
| Answer» D. \[4d\] | |
| 10405. |
The number of \[d\] electrons in \[F{{e}^{+2}}\] (atomic number of \[Fe=26\]) is not equal to that of the [MNR 1993] |
| A. | \[p\]-electrons in \[Ne\] (At. No.= 10) |
| B. | \[s\]-electrons in \[Mg\] (At. No.= 12) |
| C. | \[d\]-electrons in \[Fe\] |
| D. | \[p\]-electrons in \[C{{l}^{-}}\] (At. No. of \[Cl\] = 17) |
| Answer» E. | |
| 10406. |
Which of the metal ion will have highest number of unpaired electrons |
| A. | \[C{{u}^{+}}\] |
| B. | \[F{{e}^{2+}}\] |
| C. | \[F{{e}^{3+}}\] |
| D. | \[C{{o}^{2+}}\] |
| Answer» D. \[C{{o}^{2+}}\] | |
| 10407. |
How many unpaired electrons are present in \[N{{i}^{2+}}\] cation (atomic number = 28) [IIT 1981; MNR 1984; MP PMT 1995; Kerala PMT 2003] |
| A. | 0 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 10408. |
The maximum number of electrons that can be accommodated in a \[3d\] subshell is |
| A. | 2 |
| B. | 10 |
| C. | 6 |
| D. | 14 |
| Answer» C. 6 | |
| 10409. |
For sodium atom the number of electrons with \[m=0\] will be [RPMT 1999] |
| A. | 2 |
| B. | 7 |
| C. | 9 |
| D. | 8 |
| Answer» C. 9 | |
| 10410. |
Which of the following electronic configuration is not possible [MHCET 2003] |
| A. | \[1{{s}^{2}}2{{s}^{2}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\] |
| C. | \[[Ar]\,3{{d}^{10}},4{{s}^{2}}4{{p}^{2}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{2}},3{{s}^{1}}\] |
| Answer» E. | |
| 10411. |
The ground state term symbol for an electronic state is governed by [UPSEAT 2004] |
| A. | Heisenberg?s principle |
| B. | Hund?s rule |
| C. | Aufbau principle |
| D. | Pauli exclusion principle |
| Answer» D. Pauli exclusion principle | |
| 10412. |
Consider the ground state of \[(Z=24)\]. The numbers of electrons with the azimuthal quantum numbers, \[l=1\] and 2 are, respectively [AIEEE 2004] |
| A. | 16 and 4 |
| B. | 12 and 5 |
| C. | 12 and 4 |
| D. | 16 and 5 |
| Answer» C. 12 and 4 | |
| 10413. |
Electronic configuration \[1{{s}^{2}},\,2{{s}^{2}}2{{p}^{6}},\,3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},\,4{{s}^{1}}\] represents [CPMT 2003] |
| A. | Ground state |
| B. | Excited state |
| C. | Anionic state |
| D. | All of these |
| Answer» B. Excited state | |
| 10414. |
When the value of azimuthal quantum number is 3, magnetic quantum number can have values [DPMT 2001] |
| A. | + 1, 0, ? 1 |
| B. | + 2, + 1, 0, ? 1, ? 2 |
| C. | ? 3, ? 2, ? 1, ? 0, + 1, + 2, + 3 |
| D. | + 1, ? 1 |
| Answer» D. + 1, ? 1 | |
| 10415. |
What is the maximum number of electrons which can be accommodated in an atom in which the highest principal quantum number value is 4 [MP PMT 2000] |
| A. | 10 |
| B. | 18 |
| C. | 32 |
| D. | 54 |
| Answer» D. 54 | |
| 10416. |
An electron has principal quantum number 3. The number of its (i) sub-shells and (ii) orbitals would be respectively [MP PET 1997] |
| A. | 3 and 5 |
| B. | 3 and 7 |
| C. | 3 and 9 |
| D. | 2 and 5 |
| Answer» D. 2 and 5 | |
| 10417. |
The correct ground state electronic configuration of chromium atom is [IIT 1989, 94; MP PMT 1993; EAMCET 1997; ISM Dhanbad 1994; AFMC 1997; Bihar MEE 1996; MP PET 1995, 97; CPMT 1999; Kerala PMT 2003] |
| A. | \[[Ar]\,3{{d}^{5}}\,4{{s}^{1}}\] |
| B. | \[[Ar]\,3{{d}^{4}}4{{s}^{2}}\] |
| C. | \[[AR]3{{d}^{6}}4{{s}^{0}}\] |
| D. | \[[Ar]4{{d}^{5}}4{{s}^{1}}\] |
| Answer» B. \[[Ar]\,3{{d}^{4}}4{{s}^{2}}\] | |
| 10418. |
The electrons, identified by quantum numbers \[n\] and \[l\] (i) n = 4, \[l\]= 1, (ii) n = 4, \[l\]= 0, (iii) n = 3, \[l\]= 2, and (iv) n =3, \[l\] = 1 can be placed in order of increasing energy, from the lowest to highest, as |
| A. | (iv) < (ii) < (iii) < (i) |
| B. | (ii) < (iv) < (i) < (iii) |
| C. | (i) < (iii) < (ii) < (iv) |
| D. | (iii) < (i) < (iv) < (ii) |
| Answer» B. (ii) < (iv) < (i) < (iii) | |
| 10419. |
The ratio of the radii of the three Bohr orbits is |
| A. | 1:1/2:1/3 |
| B. | 0.0430902777777778 |
| C. | 0.0445486111111111 |
| D. | 0.0475347222222222 |
| Answer» D. 0.0475347222222222 | |
| 10420. |
The MRI (magnetic resonance imaging) body scanners used in hospitals operate with 400 MHz radio frequency The wavelength corresponding to this radio frequency is |
| A. | 0.75 m |
| B. | 0.75 cm |
| C. | 1.5m |
| D. | 2cm |
| Answer» B. 0.75 cm | |
| 10421. |
Which one of the following is not the characteristic of Planck's quantum theory of radiation [AIIMS 1991] |
| A. | The energy is not absorbed or emitted in whole number or multiple of quantum |
| B. | Radiation is associated with energy |
| C. | Radiation energy is not emitted or absorbed conti- nuously but in the form of small packets called quanta |
| D. | This magnitude of energy associated with a quantum is proportional to the frequency |
| Answer» B. Radiation is associated with energy | |
| 10422. |
Radius of the first Bohr's orbit of hydrogen atom is [RPET 2000] |
| A. | \[1.06\,{AA}\] |
| B. | \[0.22\,{AA}\] |
| C. | \[0.28\,{AA}\] |
| D. | \[0.53\,{AA}\] |
| Answer» E. | |
| 10423. |
Bohr model of atom is contradicted by [MP PMT 2002] |
| A. | Pauli?s exclusion principle |
| B. | Planck quantum theory |
| C. | Heisenberg uncertainty principle |
| D. | All of these |
| Answer» D. All of these | |
| 10424. |
The energy of electron in hydrogen atom in its grounds state is ?13.6 eV. The energy of the level corresponding to the quantum number equal to 5 is [Pb. CET 2002] |
| A. | ?0.54 eV |
| B. | ? 0.85 eV |
| C. | ? 0.64 eV |
| D. | ? 0.40 eV |
| Answer» B. ? 0.85 eV | |
| 10425. |
The Bohr orbit radius for the hydrogen atom \[(n=1)\] is approximately \[0.530{AA}\]. The radius for the first excited state \[(n=2)\] orbit is [CBSE PMT 1998; BHU 1999] |
| A. | \[0.13{AA}\] |
| B. | \[1.06{AA}\] |
| C. | \[4.77{AA}\] |
| D. | \[2.12{AA}\] |
| Answer» E. | |
| 10426. |
Any gas shows maximum deviation from ideal gas at [CPMT 1991] |
| A. | \[{{0}^{o}}C\] and 1 atmospheric pressure |
| B. | \[{{100}^{o}}C\] and 2 atmospheric pressure |
| C. | \[-{{100}^{o}}C\] and 5 atmospheric pressure |
| D. | \[{{500}^{o}}C\] and 1 atmospheric pressure |
| Answer» D. \[{{500}^{o}}C\] and 1 atmospheric pressure | |
| 10427. |
Which of the following has maximum root mean square velocity at the same temperature [Manipal PMT 2002] |
| A. | \[S{{O}_{2}}\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[{{O}_{2}}\] |
| D. | \[{{H}_{2}}\] |
| Answer» E. | |
| 10428. |
The root mean square velocity of an ideal gas at constant pressure varies density as [IIT 2000] |
| A. | \[{{d}^{2}}\] |
| B. | d |
| C. | \[\sqrt{d}\] |
| D. | \[1/\sqrt{d}\] |
| Answer» E. | |
| 10429. |
The correct order of normal boiling points of \[{{O}_{2}}\], \[{{N}_{2}}\], \[N{{H}_{3}}\] and \[C{{H}_{4}}\] for whom the values of van der Waals constant \['a'\] are 1.360, 1.390, 4.170 and 2.253 \[{{L}^{2}}\] atm \[mo{{l}^{-2}}\] respectively, is: |
| A. | \[{{O}_{2}}<{{N}_{2}}<N{{H}_{3}}<C{{H}_{4}}\] |
| B. | \[{{O}_{2}}<{{N}_{2}}<C{{H}_{4}}<NH\] |
| C. | \[N{{H}_{3}}\]\[<C{{H}_{4}}\]\[<{{N}_{2}}\]\[<\]\[{{O}_{2}}\] |
| D. | \[N{{H}_{3}}\]\[<C{{H}_{4}}\]\[<\]\[{{O}_{2}}\]\[<{{N}_{2}}\] |
| Answer» C. \[N{{H}_{3}}\]\[<C{{H}_{4}}\]\[<{{N}_{2}}\]\[<\]\[{{O}_{2}}\] | |
| 10430. |
The volume of a gas increases by a factor of 2 while the pressure decreases by a factor of 3. Given that the number of moles is unaffected, the factor by which the temperature changes is: |
| A. | \[\frac{3}{2}\] |
| B. | \[3\times 2\] |
| C. | \[\frac{2}{3}\] |
| D. | \[\frac{1}{2}\times 3\] |
| Answer» D. \[\frac{1}{2}\times 3\] | |
| 10431. |
The root mean square velocity of an ideal gas to constant Pressure varies with density as |
| A. | \[{{d}^{2}}\] |
| B. | \[d\] |
| C. | \[\sqrt{d}\] |
| D. | \[1/\sqrt{d}\] |
| Answer» E. | |
| 10432. |
The compressibility factor for definite amount of van der Waals' gas at \[0{}^\circ C\]and 100 atm is found to be 0.5. Assuming the volume of gas molecules negligible, the van der Waals' constant a for a gas is |
| A. | 1.256 \[{{L}^{2}}mo{{l}^{-2}}atm\] |
| B. | 0.256 \[{{L}^{2}}mo{{l}^{-2}}atm\] |
| C. | 2.256 \[{{L}^{2}}mo{{l}^{-2}}atm\] |
| D. | 0.0256 \[{{L}^{2}}mo{{l}^{-2}}atm\] |
| Answer» B. 0.256 \[{{L}^{2}}mo{{l}^{-2}}atm\] | |
| 10433. |
Which of the following expressions correctly represents the relationship between the average molar kinetic energy, \[\overline{K.E.}\], of CO and \[{{N}_{2}}\] molecules at the same temperature [CBSE PMT 2000] |
| A. | \[{{\overline{KE}}_{CO}}={{\overline{KE}}_{{{N}_{2}}}}\] |
| B. | \[{{\overline{KE}}_{CO}}>{{\overline{KE}}_{{{N}_{2}}}}\] |
| C. | \[{{\overline{KE}}_{CO}}<{{\overline{KE}}_{{{N}_{2}}}}\] |
| D. | Cannot be predicted unless the volumes of the gases are given |
| Answer» B. \[{{\overline{KE}}_{CO}}>{{\overline{KE}}_{{{N}_{2}}}}\] | |
| 10434. |
Mixture of sand and sulphur may best be separated by [Kerala CET 2001] |
| A. | Fractional crystallisation from aqueous solution |
| B. | Magnetic method |
| C. | Fractional distillation |
| D. | Dissolving in \[C{{S}_{2}}\] and filtering |
| Answer» E. | |
| 10435. |
In compound A, 1.00 g nitrogen unites with 0.57 g oxygen. In compound B, 2.00 g nitrogen combines with 2.24 g oxygen. In compound C, 3.00 g nitrogen combines with 5.11 g oxygen. These results obey the following law [CPMT 1971] |
| A. | Law of constant proportion |
| B. | Law of multiple proportion |
| C. | Law of reciprocal proportion |
| D. | Dalton's law of partial pressure |
| Answer» C. Law of reciprocal proportion | |
| 10436. |
The number of molecules in \[8.96\ L\] of a gas at \[{{0}^{o}}C\] and 1 atmosphere pressure is approximately [BHU 1993] |
| A. | \[6.02\times {{10}^{23}}\] |
| B. | \[12.04\times {{10}^{23}}\] |
| C. | \[18.06\times {{10}^{23}}\] |
| D. | \[24.08\times {{10}^{22}}\] |
| Answer» E. | |
| 10437. |
Nitric acid can be produced from \[N{{H}_{3}}\] in three step process I. \[4N{{H}_{3}}(g)+5{{O}_{2}}(g)\xrightarrow{{}}4NO(g)+6{{H}_{2}}O(g)\] II. \[2NO(g)+{{O}_{2}}(g)\xrightarrow{{}}2N{{O}_{2}}(g)\] III. \[3N{{O}_{2}}(g)+{{H}_{2}}O(l)\xrightarrow{{}}2HN{{O}_{3}}(aq)+NO(g)\] % yield of Ist, IInd and IIIrd are respectively 40%, 50% and 70% respectively, then what volume of\[N{{H}_{3}}(g)\] sit 1 atm and \[0{}^\circ C\] required to produce 1075 g of \[HN{{O}_{3}}\]? |
| A. | 3413 L |
| B. | 3500 L |
| C. | 6826 L |
| D. | 1750 L |
| Answer» B. 3500 L | |
| 10438. |
A hydrocarbon contains 10.5 g carbon and 1g hydrogen. Its 2.4 g has 1 L volume as 1 atm and\[{{127}^{o}}C\]. Hydrocarbon is |
| A. | \[{{C}_{6}}{{H}_{7}}\] |
| B. | \[{{C}_{6}}{{H}_{6}}\] |
| C. | \[{{C}_{5}}{{H}_{6}}\] |
| D. | \[{{C}_{6}}{{H}_{6}}\] |
| Answer» B. \[{{C}_{6}}{{H}_{6}}\] | |
| 10439. |
Calcium carbonate reacts with aqueous HCl to give \[CaC{{l}_{2}}\] and \[C{{O}_{2}}\] according to the reaction, \[CaC{{O}_{3}}(s)+2HCl(aq)\to \]\[CaC{{l}_{2}}(aq)+C{{O}_{2}}(g)+{{H}_{2}}O(l)\] In this reaction, 250 mL of 0.76 M HCI reacts with 1000 g of \[CaC{{O}_{3}}.\] Calculate the mass of \[CaC{{l}_{2}}\] formed in the reaction. |
| A. | 11.1 g |
| B. | 10.54 g |
| C. | 5.25 g |
| D. | 2.45 L |
| Answer» C. 5.25 g | |
| 10440. |
About \[6\times {{10}^{-3}}\] mol \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] reacts completely with \[9\times {{10}^{-3}}\] mol \[{{X}^{n+}}\] to give \[X{{O}^{-}}_{3}\] and \[C{{r}^{3+}}\]. The value of \[n\] is: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | none of these |
| Answer» B. 2 | |
| 10441. |
Minimum amount of \[A{{g}_{2}}C{{O}_{3}}(s)\] required to produce sufficient oxygen for the complete combustion of C, H, which produces 11.2 ltr. of \[C{{O}_{2}}\] at S.T.P after combustion is: [Ag = 108] \[A{{g}_{2}}C{{O}_{3}}(s)\to 2Ag(s)+C{{O}_{2}}(g)+1/2{{O}_{2}}(g)\]\[{{C}_{2}}{{H}_{2}}+5/2{{O}_{2}}\to 2C{{O}_{2}}+{{H}_{2}}O\] |
| A. | 276 g |
| B. | 345 g |
| C. | 690 g |
| D. | 1380 g |
| Answer» C. 690 g | |
| 10442. |
In the reaction \[4A+2B+3C\xrightarrow{{}}{{A}_{4}}{{B}_{2}}{{C}_{3}}\] what will be the number of moles of product formed. Starting from 2 moles of A, 1.2 moles of B & 1.44 moles of C: |
| A. | 0.5 |
| B. | 0. 6 |
| C. | 0.48 |
| D. | 4.64 |
| Answer» D. 4.64 | |
| 10443. |
Three isotopes of an element have mass numbers M, (M + 1) and (M + 2). The mean atomic mass is (M + 0.5). Then which of the following ratio maybe accepted for M, (M + 1), (M + 2) respectively |
| A. | 0.0423726851851852 |
| B. | 0.167372685185185 |
| C. | 0.126400462962963 |
| D. | 0.0840393518518519 |
| Answer» C. 0.126400462962963 | |
| 10444. |
15 grams of methyl alcohol is dissolved grams of water. What is the mass percent methyl alcohol in solution? |
| A. | 0.3 |
| B. | 0.5 |
| C. | 0.7 |
| D. | 0.75 |
| Answer» B. 0.5 | |
| 10445. |
How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second? |
| A. | \[19.098\times {{10}^{19}}\] years |
| B. | \[19.098\] years |
| C. | \[19.098\times {{10}^{9}}\] years |
| D. | None of these |
| Answer» D. None of these | |
| 10446. |
A self-contained breathing apparatus used \[K{{O}_{2}}\] to convert \[C{{O}_{2}}\] and \[{{H}_{2}}O\] in exhaled air into oxygen and \[KHC{{O}_{3}}\] as shown in the equation \[K{{O}_{2}}+{{H}_{2}}O+C{{O}_{2}}\xrightarrow{\,}\,KHC{{O}_{3}}+{{O}_{2}}\]. How many molecules of \[{{O}_{2(g)}}\] will be produced from the 0.044 g of \[C{{O}_{2(g)}}\] that is exhaled in a typical breath? |
| A. | \[6\times {{10}^{20}}\] |
| B. | \[4.5\times {{10}^{20}}\] |
| C. | \[2.25\times {{10}^{21}}\] |
| D. | \[4.5\times {{10}^{22}}\] |
| Answer» C. \[2.25\times {{10}^{21}}\] | |
| 10447. |
A silver coin weighing 11.34 g was dissolved in nitric acid. When sodium chloride was added to the solution all the silver (present as \[AgN{{O}_{3}}\]) was precipitated as silver chloride. The weight of the precipitated silver chloride was 14.35 g. Calculate the percentage of silver in the coin - |
| A. | 0.048 |
| B. | 0.952 |
| C. | 0.9 |
| D. | 0.8 |
| Answer» C. 0.9 | |
| 10448. |
The chloride of a metal has the formula \[MC{{l}_{4}}\]. The formula of its phosphate will be- |
| A. | \[{{M}_{2}}P{{O}_{4}}\] |
| B. | \[MP{{O}_{4}}\] |
| C. | \[{{M}_{3}}P{{O}_{4}}\] |
| D. | \[M{{(P{{O}_{4}})}_{2}}\] |
| Answer» C. \[{{M}_{3}}P{{O}_{4}}\] | |
| 10449. |
An analysis of organic compound gave 74.0% C, 8.65% of H and 17.3% N. What is the empirical formula of compound? |
| A. | \[{{C}_{5}}{{H}_{8}}N\] |
| B. | \[{{C}_{10}}{{H}_{12}}N\] |
| C. | \[{{C}_{5}}{{H}_{7}}N\] |
| D. | \[{{C}_{10}}{{H}_{14}}N\] |
| Answer» D. \[{{C}_{10}}{{H}_{14}}N\] | |
| 10450. |
When \[Fe{{S}_{2}}\] is burnt in air, it converts into \[F{{e}_{2}}{{O}_{3}}.\] The change in percentage by weight of iron in the process is (Fe = 56) |
| A. | 23% increase |
| B. | 12% decrease |
| C. | 12% increase |
| D. | no change |
| Answer» B. 12% decrease | |