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. 1s2,2s22p1                     
2. 1s2,2s22p2
3. 1s2,2s22p2,3s1             
4. 1s2,2s22p5

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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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. 12mhπ

2. h2π

3. 1mhπ

4. hπ

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. λ112λ2

4. λ1 = λ2

Subtopic:  Electromagnetic Radiation |
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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 |
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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 |
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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 |
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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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