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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.
| 1451. |
The number of unpaired electrons in \[F{{e}^{3+}}(Z=26)\] are [KCET 2000] |
| A. | 5 |
| B. | 6 |
| C. | 3 |
| D. | 4 |
| Answer» B. 6 | |
| 1452. |
Maximum electrons in a \[d\]-orbital are [CPMT 1999] |
| A. | 2 |
| B. | 10 |
| C. | 6 |
| D. | 14 |
| Answer» C. 6 | |
| 1453. |
The total number of unpaired electrons in \[d\]- orbitals of atoms of element of atomic number 29 is [CPMT 1983] |
| A. | 10 |
| B. | 1 |
| C. | 0 |
| D. | 5 |
| Answer» D. 5 | |
| 1454. |
Which of the following has more unpaired \[d\]-electrons [CBSE PMT 1999] |
| A. | \[Z{{n}^{+}}\] |
| B. | \[F{{e}^{2+}}\] |
| C. | \[{{N}^{3+}}\] |
| D. | \[C{{u}^{+}}\] |
| Answer» C. \[{{N}^{3+}}\] | |
| 1455. |
Which of the following has the maximum number of unpaired electrons [IIT 1996] |
| A. | \[M{{g}^{2+}}\] |
| B. | \[T{{i}^{3+}}\] |
| C. | \[{{V}^{3+}}\] |
| D. | \[F{{e}^{2+}}\] |
| Answer» E. | |
| 1456. |
The total number of electrons present in all the \[p\]-orbitals of bromine are [MP PET 1994] |
| A. | Five |
| B. | Eighteen |
| C. | Seventeen |
| D. | Thirty five |
| Answer» D. Thirty five | |
| 1457. |
A transition metal \[X\] has a configuration \[[Ar]3{{d}^{4}}\] in its \[+3\] oxidation state. Its atomic number is [EAMCET 1990] |
| A. | 25 |
| B. | 26 |
| C. | 22 |
| D. | 19 |
| Answer» B. 26 | |
| 1458. |
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. | |
| 1459. |
The number of unpaired electrons in carbon atom in excited state is [MNR 1987] |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» E. | |
| 1460. |
Maximum number of electrons present in \['N'\] shell is [EAMCET 1984] |
| A. | 18 |
| B. | 32 |
| C. | 2 |
| D. | 8 |
| Answer» C. 2 | |
| 1461. |
The atom of the element having atomic number 14 should have [AMU 1984] |
| A. | One unpaired electron |
| B. | Two unpaired electrons |
| C. | Three unpaired electrons |
| D. | Four unpaired electrons |
| Answer» C. Three unpaired electrons | |
| 1462. |
An atom has 2 electrons in \[K\] shell, 8 electrons in \[L\] shell and 6 electrons in \[M\] shell. The number of \[s\]-electrons present in that element is [CPMT 1989] |
| A. | 6 |
| B. | 5 |
| C. | 7 |
| D. | 10 |
| Answer» B. 5 | |
| 1463. |
A filled or half-filled set of \[p\] or \[d\]-orbitals is spherically symmetric. Point out the species which has spherical symmetry [NCERT 1983] |
| A. | \[Na\] |
| B. | \[C\] |
| C. | \[C{{l}^{-}}\] |
| D. | \[Fe\] |
| Answer» D. \[Fe\] | |
| 1464. |
Which orbital is dumb-bell shaped [MP PMT 1986; MP PET/PMT 1998] |
| A. | \[s\]-orbital |
| B. | \[p\]-orbital |
| C. | \[d\]-orbital |
| D. | \[f\]-orbital |
| Answer» C. \[d\]-orbital | |
| 1465. |
The molecule having one unpaired electron is |
| A. | \[NO\] |
| B. | \[CO\] |
| C. | \[C{{N}^{-}}\] |
| D. | \[{{O}_{2}}\] |
| Answer» B. \[CO\] | |
| 1466. |
The maximum number of unpaired electron can be present in \[d\]orbitals are |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» D. 7 | |
| 1467. |
Which of the following metal ions will have maximum number of unpaired electrons [CPMT 1996] |
| A. | \[F{{e}^{+2}}\] |
| B. | \[C{{O}^{+2}}\] |
| C. | \[N{{i}^{+2}}\] |
| D. | \[M{{n}^{+2}}\] |
| Answer» E. | |
| 1468. |
\[3{{d}^{10}}4{{s}^{0}}\] electronic configuration exhibits by |
| A. | \[Z{{n}^{++}}\] |
| B. | \[C{{u}^{++}}\] |
| C. | \[C{{d}^{++}}\] |
| D. | \[H{{g}^{++}}\] |
| Answer» B. \[C{{u}^{++}}\] | |
| 1469. |
The number of unpaired electrons in a chromic ion \[C{{r}^{3+}}\] (atomic number = 24) is [MNR 1986; CPMT 1992] |
| A. | 6 |
| B. | 4 |
| C. | 3 |
| D. | 1 |
| Answer» D. 1 | |
| 1470. |
The number of unpaired electrons in an \[{{O}_{2}}\] molecule is [MNR 1983] |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 1471. |
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 | |
| 1472. |
Number of unpaired electrons in the ground state of beryllium atom is |
| A. | 2 |
| B. | 1 |
| C. | 0 |
| D. | All the above |
| Answer» D. All the above | |
| 1473. |
The maximum number of electrons which each sub-shell can occupy is [Pb. CET 1989] |
| A. | \[2{{n}^{2}}\] |
| B. | \[2n\] |
| C. | \[2(2l+1)\] |
| D. | \[(2l+1)\] |
| Answer» D. \[(2l+1)\] | |
| 1474. |
If \[n=3\], then the value of \['l'\] which is incorrect [CPMT 1994] |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 1475. |
The number of unpaired electrons in \[1{{s}^{2}},\,2{{s}^{2}}2{{p}^{4}}\] is [NCERT 1984; CPMT 1991; MP PMT 1996, 2002] |
| A. | 4 |
| B. | 2 |
| C. | 0 |
| D. | 1 |
| Answer» C. 0 | |
| 1476. |
Total number of unpaired electrons in an atom of atomic number 29 is [CPMT 1984, 93] |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 2 |
| Answer» B. 3 | |
| 1477. |
Number of unpaired electrons in \[1{{s}^{2}}2{{s}^{2}}2{{p}^{3}}\] is [CPMT 1982; MP PMT 1987; BHU 1987; CBSE PMT 1990; CET Pune 1998; AIIMS 2000] |
| A. | 2 |
| B. | 0 |
| C. | 3 |
| D. | 1 |
| Answer» D. 1 | |
| 1478. |
The number of electrons that can be accommodated in \[d{{z}^{2}}\] orbital is [Kurukshetra CEE 2002] |
| A. | 10 |
| B. | 1 |
| C. | 4 |
| D. | 2 |
| Answer» E. | |
| 1479. |
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 | |
| 1480. |
The configuration \[1{{s}^{2}}2{{s}^{2}}2{{p}^{5}}3{{s}^{1}}\] shows [AIIMS 1997] |
| A. | Ground state of fluorine atom |
| B. | Excited state of fluorine atom |
| C. | Excited state of neon atom |
| D. | Excited state of ion \[O_{2}^{-}\] |
| Answer» D. Excited state of ion \[O_{2}^{-}\] | |
| 1481. |
The maximum number of electrons in an atom with \[l=2\] and \[n=3\] is [MP PET/PMT 1998] |
| A. | 2 |
| B. | 6 |
| C. | 12 |
| D. | 10 |
| Answer» E. | |
| 1482. |
The number of electrons in the atom which has 20 protons in the nucleus [CPMT 1981, 93; CBSE PMT 1989] |
| A. | 20 |
| B. | 10 |
| C. | 30 |
| D. | 40 |
| Answer» B. 10 | |
| 1483. |
The maximum number of electrons accommodated in \[5f\] orbitals are [MP PET 1996] |
| A. | 5 |
| B. | 10 |
| C. | 14 |
| D. | 18 |
| Answer» D. 18 | |
| 1484. |
Which of the following sets of quantum numbers represent an impossible arrangement [IIT 1986; MP PET 1995] |
| A. | n ? 3 l ? 2 m - - 2 \[{{m}_{s}}\]- (+)\[\frac{1}{2}\] |
| B. | n ? 4 l ? 0 m ? 0 \[{{m}_{s}}\]- (?)\[\frac{1}{2}\] |
| C. | n ? 3 l ? 2 m - -3 \[{{m}_{s}}\] - (+)\[\frac{1}{2}\] |
| D. | n ? 5 l ? 3 m ? 0 \[{{m}_{s}}\] - (?) \[\frac{1}{2}\] |
| Answer» D. n ? 5 l ? 3 m ? 0 \[{{m}_{s}}\] - (?) \[\frac{1}{2}\] | |
| 1485. |
The number of electrons which can be accommodated in an orbital is [DPMT 1981; AFMC 1988] |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 1486. |
The maximum number of electrons that can be accommodated in \['f'\] sub shell is [CPMT 1983, 84; MP PET/PMT 1988; BITS 1988] |
| A. | 2 |
| B. | 8 |
| C. | 32 |
| D. | 14 |
| Answer» E. | |
| 1487. |
\[{{p}_{x}}\] orbital can accommodate [MNR 1990; IIT 1983; MADT Bihar 1995; BCECE 2005] |
| A. | 4 electrons |
| B. | 6 electrons |
| C. | 2 electrons with parallel spins |
| D. | 2 electrons with opposite spins |
| Answer» E. | |
| 1488. |
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. | |
| 1489. |
The number of orbitals present in the shell with \[n=4\] is [UPSEAT 2004] |
| A. | 16 |
| B. | 8 |
| C. | 18 |
| D. | 32 |
| Answer» B. 8 | |
| 1490. |
Number of two electron can have the same values of ?? quantum numbers [UPSEAT 2004] |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» D. Four | |
| 1491. |
The maximum number of electrons in \[p\]-orbital with \[n=5,\,m=1\] is [Pb. CET 2003] |
| A. | 6 |
| B. | 2 |
| C. | 14 |
| D. | 10 |
| Answer» C. 14 | |
| 1492. |
The electronic configuration of element with atomic number 24 is [Pb. CET 2004] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{4}},4{{s}^{2}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{6}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}4{{s}^{1}}\] |
| Answer» E. | |
| 1493. |
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 | |
| 1494. |
Which of the following electronic configuration is not possible according to Hund?s rule [Kerala PMT 2004] |
| A. | \[1{{s}^{2}}2{{s}^{2}}\] |
| B. | \[1{{s}^{2}}2{{s}^{1}}\] |
| C. | \[1{{s}^{2}}2{{s}^{2}}2p_{x}^{1}2p_{y}^{1}2p_{x}^{1}\] |
| D. | \[1{{s}^{2}}2{{s}^{2}}2p_{x}^{2}\] |
| E. | \[1{{s}^{2}}2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}2p_{z}^{1}\] |
| Answer» E. \[1{{s}^{2}}2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}2p_{z}^{1}\] | |
| 1495. |
The magnetic quantum number specifies [MNR 1986; BHU 1982; CPMT 1989, 94; MP PET 1999; AFMC 1999; AMU (Engg.) 1999] |
| A. | Size of orbitals |
| B. | Shape of orbitals |
| C. | Orientation of orbitals |
| D. | Nuclear stability |
| Answer» D. Nuclear stability | |
| 1496. |
The four quantum numbers of the valence electron of potassium are [DPMT 2004] |
| A. | 4, 1, 0 and \[\frac{1}{2}\] |
| B. | 4, 0, 1 and \[\frac{1}{2}\] |
| C. | 4, 0, 0 and \[+\frac{1}{2}\] |
| D. | 4, 1, 1 and \[\frac{1}{2}\] |
| Answer» D. 4, 1, 1 and \[\frac{1}{2}\] | |
| 1497. |
Which of the following sets of quantum numbers is correct for an electron in \[4f\] orbital [AIEEE 2004] |
| A. | \[n=4,\,l=3,\,m=+1,\,s=+\frac{1}{2}\] |
| B. | \[n=4,\,l=4,\,m=-4,\,s=-\frac{1}{2}\] |
| C. | \[n=4,\,l=3,\,m=+4,\,s=+\frac{1}{2}\] |
| D. | \[n=3,\,l=2,\,m=-2,\,s=+\frac{1}{2}\] |
| Answer» B. \[n=4,\,l=4,\,m=-4,\,s=-\frac{1}{2}\] | |
| 1498. |
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 | |
| 1499. |
The number of \[2p\] electrons having spin quantum number \[s=-1/2\] are [KCET 2004] |
| A. | 6 |
| B. | 0 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 1500. |
For principle quantum number \[n=4\] the total number of orbitals having \[l=3\] [AIIMS 2004] |
| A. | 3 |
| B. | 7 |
| C. | 5 |
| D. | 9 |
| Answer» C. 5 | |