Which of the following species has more number of electrons in comparison with the neutrons?

1. Al3+

2. O2-

3. F-

4. C

Subtopic:  Number of Electron, Proton & Neutron |
 79%
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The ratio of the difference in energy between the first and second Bohr orbit to that between the second and the third Bohr orbit of hydrogen is -

1. 1/2

2. 1/3

3. 4/9

4. 27/5

Subtopic:  Bohr's Theory |
 78%
From NCERT
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The radius of second stationary orbit in Bohr's atom is R. The radius of 3rd orbit will be:-

1. 9R

2. R/4

3. 9R/4

4. 2R

Subtopic:  Bohr's Theory |
 81%
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Bohr's model is not valid for:-

(1) H-atom

(2) D-atom

(3) T-atom

(4) He-atom

Subtopic:  Bohr's Theory |
 86%
From NCERT
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Which of the following pairs of d-orbitals will have electron density along the axes?

1.  dz2,dxz

2.  dxz,dyz

3.  dz2,dx2-y2

4.  dxy,dx2-y2

Subtopic:  Shell & Subshell |
 83%
From NCERT
NEET - 2016
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Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?

(1) 3s 4s 3p 3d                   

(2) 4s 3s 3p 3d

(3) 3s 3p 3d 4s                   

(4) 3s 3p 4s 3d

Subtopic:  AUFBAU Principle |
 82%
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What is the maximum numbers of electrons that can be associated with the following set of quantum numbers?

n=3, l = 1 and m=-1

(1) 10
(2) 6
(3) 4
(4) 2

 

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 73%
From NCERT
NEET - 2013
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Maximum number of electrons in a subshell 4f is

(1) 14
(2) 16
(3) 10
(4) 12

 

Subtopic:  Shell & Subshell |
 85%
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Which one of the following ions has electronic configuration [Ar]3d6?

(At. no: Mn = 25, Fe = 26, Co = 27, Ni =28)

(1) Ni3+               

(2) Mn3+

(3) Fe3+               

(4) Co3+

Subtopic:  AUFBAU Principle |
 81%
From NCERT
NEET - 2010
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If the uncertainty in position and momentum are equivalent, what is the corresponding uncertainty in velocity?

1. 12mhπ 2. h2π
3. 1mhπ 4. hπ
Subtopic:  Heisenberg Uncertainty Principle |
 81%
From NCERT
NEET - 2008
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