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%
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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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The correct Schrodinger's wave equation for a electron with total energy E and potential energy V is given by

1.  2ψx2+2ψy2+2ψz2+8π2mh2E-V ψ=0

2.  2ψx2+2ψy2+2ψz2+8πmh2E-V ψ=0

3.  2ψx2+2ψy2+2ψz2+8π2mh2E-V ψ=0

4.  None of the above.

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 59%
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Which of the following expressions represents the spectrum of Balmer series (If n is the principal quantum number of higher energy level) in Hydrogen atom?

1.  v¯=Rn-1 n+1n2 cm-1

2.  v¯=Rn-2 n+24n2 cm-1

3.  v¯=Rn-2 n+2n2 cm-1

4.  v¯=Rn-1 n+14n2 cm-1

Subtopic:  Hydrogen Spectra |
 68%
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