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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.
| 1401. |
The number of orbitals in \[2p\] sub-shell is [NCERT 1973; MP PMT 1996] |
| A. | 6 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 1402. |
The angular momentum of an electron depends on [BHU 1978; NCERT 1981] |
| A. | Principal quantum number |
| B. | Azimuthal quantum number |
| C. | Magnetic quantum number |
| D. | All of these |
| Answer» C. Magnetic quantum number | |
| 1403. |
The four quantum numbers of the outermost orbital of \[K\] (atomic no. =19) are [MP PET 1993, 94] |
| A. | \[n=2,\,l=0,\,m=0,\,s=+\frac{1}{2}\] |
| B. | \[n=4,\,l=0,\,m=0,\,s=+\frac{1}{2}\] |
| C. | \[n=3,\,l=1,\,m=1,\,s=+\frac{1}{2}\] |
| D. | \[n=4,\,l=2,\,m=-1,\,s=+\frac{1}{2}\] |
| Answer» C. \[n=3,\,l=1,\,m=1,\,s=+\frac{1}{2}\] | |
| 1404. |
In any atom which sub-shell will have the highest energy in the following |
| A. | \[3p\] |
| B. | \[3d\] |
| C. | \[4s\] |
| D. | \[3s\] |
| Answer» C. \[4s\] | |
| 1405. |
Which electronic configuration is not observing the (\[n+l\]) rule |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{1}},4{{s}^{2}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}s{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{7}},4{{s}^{2}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{1}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{8}},4{{s}^{2}}\] |
| Answer» D. \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{8}},4{{s}^{2}}\] | |
| 1406. |
Nitrogen has the electronic configuration \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{1}2p_{y}^{1}2p_{z}^{1}\] and not \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}2p_{z}^{0}\] which is determined by [DPMT 1982, 83, 89; MP PMT/PET 1988; EAMCET 1988] |
| A. | Aufbau's principle |
| B. | Pauli's exclusion principle |
| C. | Hund's rule |
| D. | Uncertainty principle |
| Answer» D. Uncertainty principle | |
| 1407. |
If value of azimuthal quantum number \[l\] is 2, then total possible values of magnetic quantum number will be |
| A. | 7 |
| B. | 5 |
| C. | 3 |
| D. | 2 |
| Answer» C. 3 | |
| 1408. |
The number of radial nodes of 3s and 2p orbitals are respectively. [IIT-JEE 2005] |
| A. | 2, 0 |
| B. | 0, 2 |
| C. | 1, 2 |
| D. | 2, 1 |
| Answer» B. 0, 2 | |
| 1409. |
Which electronic configuration for oxygen is correct according to Hund's rule of multiplicity |
| A. | \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}2p_{z}^{1}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{2}2p_{y}^{2}2p_{z}^{0}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{3}2p_{y}^{1}2p_{z}^{0}\] |
| D. | None of these |
| Answer» B. \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{2}2p_{y}^{2}2p_{z}^{0}\] | |
| 1410. |
Which of the sub-shell is circular |
| A. | \[4s\] |
| B. | \[4f\] |
| C. | \[4p\] |
| D. | \[4d\] |
| Answer» B. \[4f\] | |
| 1411. |
The maximum number of electrons that can be accommodated in the \[{{M}^{th}}\] shell is |
| A. | 2 |
| B. | 8 |
| C. | 18 |
| D. | 32 |
| Answer» D. 32 | |
| 1412. |
The electron density between \[1s\]and \[2s\]orbital is |
| A. | High |
| B. | Low |
| C. | Zero |
| D. | None of these |
| Answer» D. None of these | |
| 1413. |
For \[ns\] orbital, the magnetic quantum number has value |
| A. | 2 |
| B. | 4 |
| C. | ? 1 |
| D. | 0 |
| Answer» E. | |
| 1414. |
The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by [NCERT 1979; RPMT 1999; DCE 1999, 2002; CPMT 2001; MP PMT 2002; Pb. PMT / CET 2002] |
| A. | Pauli's exclusion principle |
| B. | Hund's rule |
| C. | Aufbau's principle |
| D. | Uncertainty principle |
| Answer» C. Aufbau's principle | |
| 1415. |
The maximum energy is present in any electron at |
| A. | Nucleus |
| B. | Ground state |
| C. | First excited state |
| D. | Infinite distance from the nucleus |
| Answer» E. | |
| 1416. |
In a given atom no two electrons can have the same values for all the four quantum numbers. This is called [BHU 1979; AMU 1983; EAMCET 1980, 83; MADT Bihar 1980; CPMT 1986, 90, 92; NCERT 1978, 84; RPMT 1997; CBSE PMT 1991; MP PET 1986, 99] |
| A. | Hund's rule |
| B. | Aufbau's principle |
| C. | Uncertainty principle |
| D. | Pauli's exclusion principle |
| Answer» E. | |
| 1417. |
The four quantum number for the valence shell electron or last electron of sodium (Z = 11) is [MP PMT 1999] |
| A. | \[n=2,\,l=1,\,m=-1,\,s=-\frac{1}{2}\] |
| B. | \[n=3,\,l=0,\,m=0,\,s=+\frac{1}{2}\] |
| C. | \[n=3,\,l=2,\,m=-2,\,s=-\frac{1}{2}\] |
| D. | \[n=3,\,l=2,\,m=2,\,s=+\frac{1}{2}\] |
| Answer» C. \[n=3,\,l=2,\,m=-2,\,s=-\frac{1}{2}\] | |
| 1418. |
The total number of orbitals in an energy level designated by principal quantum number \[n\] is equal to [AIIMS 1997; J&K CET 2005] |
| A. | \[2n\] |
| B. | \[2{{n}^{2}}\] |
| C. | \[n\] |
| D. | \[{{n}^{2}}\] |
| Answer» E. | |
| 1419. |
A completely filled \[d\]-orbital \[({{d}^{10}})\] [MNR 1987] |
| A. | Spherically symmetrical |
| B. | Has octahedral symmetry |
| C. | Has tetrahedral symmetry |
| D. | Depends on the atom |
| Answer» B. Has octahedral symmetry | |
| 1420. |
If magnetic quantum number of a given atom represented by ?3, then what will be its principal quantum number [BHU 2005] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 1421. |
The shape of an orbital is given by the quantum number [NCERT 1984; MP PMT 1996] |
| A. | \[n\] |
| B. | \[l\] |
| C. | \[m\] |
| D. | \[s\] |
| Answer» C. \[m\] | |
| 1422. |
The electronic configuration of calcium ion \[(C{{a}^{2+}})\] is [CMC Vellore 1991] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}s{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{1}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{2}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}s{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}\] |
| E. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{0}}\] |
| Answer» F. | |
| 1423. |
Chromium has the electronic configuration \[4{{s}^{1}}3{{d}^{5}}\] rather than \[4{{s}^{2}}3{{d}^{4}}\] because |
| A. | \[4s\] and \[3d\] have the same energy |
| B. | \[4s\] has a higher energy than \[3d\] |
| C. | \[4{{s}^{1}}\] is more stable than \[4{{s}^{2}}\] |
| D. | \[4{{s}^{1}}3{{d}^{5}}\] half-filled is more stable than \[4{{s}^{2}}3{{d}^{4}}\] |
| Answer» E. | |
| 1424. |
For the dumb-bell shaped orbital, the value of \[l\] is [CPMT 1987, 2003] |
| A. | 3 |
| B. | 1 |
| C. | 0 |
| D. | 2 |
| Answer» C. 0 | |
| 1425. |
The valence electron in the carbon atom are [MNR 1982] |
| A. | 0 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 1426. |
The number of electrons in the valence shell of calcium is [IIT 1975] |
| A. | 6 |
| B. | 8 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 1427. |
The following has zero valency [DPMT 1991] |
| A. | Sodium |
| B. | Beryllium |
| C. | Aluminium |
| D. | Krypton |
| Answer» E. | |
| 1428. |
Which one is the correct outer configuration of chromium [AIIMS 1980, 91; BHU 1995] |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 1429. |
Electronic configuration of deuterium atom is [J&K CET 2005] |
| A. | \[1{{s}^{1}}\] |
| B. | \[2{{s}^{2}}\] |
| C. | \[2{{s}^{1}}\] |
| D. | \[1{{s}^{2}}\] |
| Answer» B. \[2{{s}^{2}}\] | |
| 1430. |
Which of the following sequence is correct as per Aufbau principle [DPMT 2005] |
| A. | \[3s<3d<4s<4p\] |
| B. | \[1s<2p<4s<3d\] |
| C. | \[2s<5s<4p<5d\] |
| D. | \[2s<2p<3d<3p\] |
| Answer» C. \[2s<5s<4p<5d\] | |
| 1431. |
Number of unpaired electrons in \[M{{n}^{4+}}\] is [DPMT 2005] |
| A. | 3 |
| B. | 5 |
| C. | 6 |
| D. | 4 |
| Answer» B. 5 | |
| 1432. |
The maximum number of electrons present in an orbit \[l=3\], is [Pb. PMT 2004] |
| A. | 6 |
| B. | 8 |
| C. | 10 |
| D. | 14 |
| Answer» E. | |
| 1433. |
Number of nodal centres for 2s orbital [RPET 2003] |
| A. | 1 |
| B. | 0 |
| C. | 4 |
| D. | 3 |
| Answer» B. 0 | |
| 1434. |
Orbital angular momentum for a d-electron is [MP PET 2003] |
| A. | \[\frac{6h}{2\pi }\] |
| B. | \[\frac{\sqrt{6}\,h}{2\pi }\] |
| C. | \[\frac{12h}{2\pi }\] |
| D. | \[\frac{\sqrt{12}\,h}{2\pi }\] |
| Answer» C. \[\frac{12h}{2\pi }\] | |
| 1435. |
p-orbitals of an atom in presence of magnetic field are [Pb. PMT 2002] |
| A. | Two fold degenerate |
| B. | Non degenerate |
| C. | Three fold degenerate |
| D. | None of these |
| Answer» C. Three fold degenerate | |
| 1436. |
The orbital with maximum energy is [CPMT 2002] |
| A. | 3d |
| B. | 5p |
| C. | 4s |
| D. | 6d |
| Answer» E. | |
| 1437. |
The correct order of increasing energy of atomic orbitals is [MP PET 2002] |
| A. | \[5p<4f<6s<5d\] |
| B. | \[5p<6s<4f<5d\] |
| C. | \[4f<5p<5d<6s\] |
| D. | \[5p<5d<4f<6s\] |
| Answer» C. \[4f<5p<5d<6s\] | |
| 1438. |
The atomic orbitals are progressively filled in order of increasing energy. This principle is called as [MP PET 2001] |
| A. | Hund?s rule |
| B. | Aufbau principle |
| C. | Exclusion principle |
| D. | de-Broglie rule |
| Answer» C. Exclusion principle | |
| 1439. |
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 | |
| 1440. |
Aufbau principle is obeyed in which of the following electronic configurations [AFMC 1999] |
| A. | \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\] |
| B. | \[1{{s}^{2}}3{{p}^{3}}3{{s}^{2}}\] |
| C. | \[1{{s}^{2}}3{{s}^{2}}3{{p}^{6}}\] |
| D. | \[1{{s}^{2}}2{{s}^{2}}3{{s}^{2}}\] |
| Answer» B. \[1{{s}^{2}}3{{p}^{3}}3{{s}^{2}}\] | |
| 1441. |
Which of the following explains the sequence of filling the electrons in different shells [AIIMS 1998; BHU 1999] |
| A. | Hund's rule |
| B. | Octet rule |
| C. | Aufbau principle |
| D. | All of these |
| Answer» D. All of these | |
| 1442. |
Aufbau principle is not satisfied by [MP PMT 1997] |
| A. | \[Cr\] and \[Cl\] |
| B. | \[Cu\] and \[Ag\] |
| C. | \[Cr\] and \[Mg\] |
| D. | \[Cu\] and \[Na\] |
| Answer» C. \[Cr\] and \[Mg\] | |
| 1443. |
Which of the following principles/rules limits the maximum number of electrons in an orbital to two [CBSE PMT 1989] |
| A. | Aufbau principle |
| B. | Pauli's exclusion principle |
| C. | Hund's rule of maximum multiplicity |
| D. | Heisenberg's uncertainty principle |
| Answer» C. Hund's rule of maximum multiplicity | |
| 1444. |
The shape of \[2p\]orbital is [CPMT 1983; NCERT 1979] |
| A. | Spherical |
| B. | Ellipsoidal |
| C. | Dumb-bell |
| D. | Pyramidal |
| Answer» D. Pyramidal | |
| 1445. |
The energy of an electron of \[2{{p}_{y}}\] orbital is [AMU 1984] |
| A. | Greater than that of \[2{{p}_{x}}\] orbital |
| B. | Less than that of \[2{{p}_{x}}\] orbital |
| C. | Equal to that of \[2s\] orbital |
| D. | Same as that of \[2{{p}_{z}}\] orbital |
| Answer» E. | |
| 1446. |
According to Aufbau's principle, which of the three \[4d,\,5p\] and \[5s\]will be filled with electrons first [MADT Bihar 1984] |
| A. | \[4d\] |
| B. | \[5p\] |
| C. | \[5s\] |
| D. | \[4d\] and \[5s\] will be filled simultaneously |
| Answer» D. \[4d\] and \[5s\] will be filled simultaneously | |
| 1447. |
The statements [AIIMS 1982] (i) In filling a group of orbitals of equal energy, it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular orbital. (ii) When two electrons are placed in two different orbitals, energy is lower if the spins are parallelare valid for |
| A. | Aufbau principle |
| B. | Hund's rule |
| C. | Pauli's exclusion principle |
| D. | Uncertainty principle |
| Answer» C. Pauli's exclusion principle | |
| 1448. |
For the energy levels in an atom, which one of the following statements is correct [AIIMS 1983] |
| A. | There are seven principal electron energy levels |
| B. | The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons |
| C. | The \[M\]energy level can have maximum of 32 electrons |
| D. | The \[4s\] sub-energy level is at a higher energy than the \[3d\] sub-energy level |
| Answer» C. The \[M\]energy level can have maximum of 32 electrons | |
| 1449. |
Pauli's exclusion principle states that [CPMT 1983, 84] |
| A. | Nucleus of an atom contains no negative charge |
| B. | Electrons move in circular orbits around the nucleus |
| C. | Electrons occupy orbitals of lowest energy |
| D. | All the four quantum numbers of two electrons in an atom cannot be equal |
| Answer» E. | |
| 1450. |
How many unpaired electrons are present in cobalt [Co] metal [RPMT 2002] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 7 |
| Answer» C. 4 | |