The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., λ1 and λ2 will be:

1.  λ1=2λ2

2.  λ1=4λ2

3.  λ1=12λ2

4.  λ1=λ2

Subtopic:  Bohr's Theory |
 85%
From NCERT
AIPMT - 2011
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If n = 6, the correct sequence for the filling of electrons will be: 

1. ns  n-1 d  n-2 f  np

2. ns - n-2 f  np  n-1 d

3. ns - np  n-1d  n-2 f

4. ns  n-2 f  n-1 d  np

Subtopic:  AUFBAU Principle |
 64%
From NCERT
AIPMT - 2011
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An element X has the following isotopic composition: 
200X: 90% 
199X: 8.0% 
202X: 2.0% 
The weighted average atomic mass of the naturally-occurring element X is closest to:

1. 200 amu
2. 201 amu
3. 202 amu
4. 199 amu

Subtopic:  Number of Electron, Proton & Neutron |
 67%
From NCERT
AIPMT - 2007
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4d, 5p, 5f, and 6p orbitals are arranged in the order of decreasing energy.
The correct option is:

1.  5f>6p>4d>5p

2.  5f>6p>5p>4d

3.  6p>5f>5p>4d

4.  6p>5f>4d>5p

Subtopic:  AUFBAU Principle |
 67%
From NCERT
NEET - 2019
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Which of the following series of transitions in the spectrum of hydrogen atoms falls in the visible region?

1. Brackett series

2. Lyman series

3. Balmer series

4. Paschen series

Subtopic:  Hydrogen Spectra |
 82%
From NCERT
NEET - 2019
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The orbital diagram in which both Pauli's exclusion principle and Hund's rule are violated is: 
 

1.    

2.    

3.    

4.    

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
 68%
From NCERT
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If the electronic structure of oxygen atom is written as 1s2, 2s2  it would violate

1.  Hund's rule

2.  Paulis exclusion principle

3.  Both Hund's and Pauli's principles

4.  None of the above

Subtopic:  Pauli's Exclusion Principle & Hund's Rule | AUFBAU Principle |
 71%
From NCERT
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The correct order of the total number of nodes of atomic orbitals is: 

1.  4f > 6s > 5d

2.  6s > 5d > 4f

3.  4f > 5d > 6s

4.  5d > 4f > 6s

Subtopic:  Nodal Plane |
 73%
From NCERT
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Correct statement among the following is: 

1.  Number of angular nodes = n - l - 1

2.  Number of radial nodes = l

3.  Total number of nodes = n -1

4.  All of the above

Subtopic:  Nodal Plane |
 61%
From NCERT
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Maximum number of total nodes is present in:

1.  5s

2.  5p

3.  5d

4.  All have same number of nodes

Subtopic:  Nodal Plane |
 74%
From NCERT
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