# Consider the following sets of quantum numbers:               n         l         m         s (i)         3         0         0          +1/2 (ii)        2         2         1          +1/2 (iii)       4         3        -2           -1/2 (iv)       1         0        -1           -1/2 (v)        3         2         3           +1/2 Which of the following sets of quantum numbers is not possible? 1. ii, iii and iv                              2. i, ii, iii and iv 3. ii, iv and v                                4. i and iii

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
85%
From NCERT
NEET - 2007
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An electronic configuration representing an atom in the excited state is:

$1.$ $1{\mathrm{s}}^{2},2{\mathrm{s}}^{2}2{\mathrm{p}}^{1}$                     
$2.$ $1{\mathrm{s}}^{2},2{\mathrm{s}}^{2}2{\mathrm{p}}^{2}$
$3.$ $1{\mathrm{s}}^{2},2{\mathrm{s}}^{2}2{\mathrm{p}}^{2},3{\mathrm{s}}^{1}$             
$4.$ $1{\mathrm{s}}^{2},2{\mathrm{s}}^{2}2{\mathrm{p}}^{5}$

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
81%
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The measurement of the electron position is associated with an uncertainty in momentum which is equal to 1x10-18 g cm s-1. The uncertainty in velocity of the electron will be:

(mass of an electron is 9 x 10-28 g)

1. 1 x 109 cm s-1

2. 1 x 106 cm s-1

3. 1 x 105 cm s-1

4. 1 x 1011 cm s-1

Subtopic:  Heisenberg Uncertainty Principle |
63%
From NCERT
NEET - 2008
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If uncertainty in position and momentum are both equal, then uncertainty in velocity will be:

1. $\frac{1}{2\mathrm{m}}\sqrt{\frac{\mathrm{h}}{\mathrm{\pi }}}$

2. $\sqrt{\frac{\mathrm{h}}{2\mathrm{\pi }}}$

3. $\frac{1}{\mathrm{m}}\sqrt{\frac{\mathrm{h}}{\mathrm{\pi }}}$

4. $\frac{\mathrm{h}}{\mathrm{\pi }}$

Subtopic:  Heisenberg Uncertainty Principle |
77%
From NCERT
NEET - 2008
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The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ( λ1 and λ2 ) will be:

1. λ1 = 2λ2

2. λ1 = 4λ2

3. λ1$\frac{1}{2}$λ2

4. λ1 = λ2

85%
From NCERT
NEET - 2011
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The maximum number of electrons in a subshell with l = 3 and n = 4 is

1. 14

2. 16

3. 10

4. 12

Subtopic:  Shell & Subshell |
80%
From NCERT
NEET - 2012
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The magnetic moment of 2.84 BM can be shown by:

(At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)

1. Ni2+

2. Ti3+

3. Cr3+

4. Co2+

Subtopic:  AUFBAU Principle |
69%
From NCERT
NEET - 2015
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The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Tb Atomic no. 65) are

1. [Xe]4f65d16s2, [Xe]4f75d16s2 and [Xe]4f96s2

2. [Xe]4f65d16s2, [Xe]4f75d16s2 and [Xe]4f85d16s2

3. [Xe]4f76s2, [Xe]4f75d16s2 and [Xe]4f96s2

4. [Xe]4f76s2, [Xe]4f86s2 and [Xe]4f85d16s2

Subtopic:  AUFBAU Principle |
57%
From NCERT
NEET - 2016
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The number of electrons that can be fit into the orbital for which n = 3 and l = 1, is:

1. 2

2. 6

3. 10

4. 14

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
From NCERT
NEET - 2016
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The group number and electronic configuration of  element Z =114 is:

1. Halogen family, [Rn]5f146d107s27p5

2. Carbon family, [Rn]5f146d107s27p2

3. Oxygen family, [Rn]5f146d107s27p4

4. Nitrogen family, [Rn]5f146d107s27p6

Subtopic:  AUFBAU Principle |
76%
From NCERT
NEET - 2017
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