In hydrogen atom, what is the de Broglie wavelength of an electron in the second Bohr orbit is: [Given that Bohr radius, a0=52.9 pm]

1. 211.6 pm

2. 211.6 πpm

3. 52.9 πpm

4. 105.8 pm

Subtopic:  Bohr's Theory |
NEET - 2019
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Orbital having 3 angular nodes and 3 total nodes is:
1. 5 p
2. 3 d
3. 4 f
4. 6 d

Subtopic:  Nodal Plane |
 76%
From NCERT
NEET - 2019
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In a subshell, if the number of radial nodes is two times the number of angular nodes, then the minimum possible value of the principal quantum number (n) is: 

[angular nodes are non-zero)

1. 1 2. 2
3. 3 4. 4
Subtopic:  Nodal Plane |
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The charge on the electron and proton are reduced to 23rd of their original values. Let the present value of the Rydberg constant of H-atom be R, then the new value of the Rydberg constant will be

1.  2R3
2.  4R9
3.  8R27
4.  16R81

Subtopic:  Bohr's Theory |
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Of the following transition in hydrogen atom, the one which gives an absorption line of lowest frequency is
 

1.  n = 1 to n = 2

2.  n = 3 to n = 8

3.  n = 2 to n = 1

4.  n = 8 to n = 3

Subtopic:  Bohr's Theory |
 52%
From NCERT
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The wavelength of the spectral line obtained in the spectrum of Li+2
when the transition takes place between levels whose sum is 4 and the difference is 2, will be:

1.  11.4 x 10-6 cm

2.  1.14 x 10-6cm

3.  0.114 x 10-6 cm

4.  1.14 x 10-8 cm

Subtopic:  Hydrogen Spectra |
 62%
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Photons of wavelength 4000  Ao are used to break l2 molecules. The percentage of energy converted to the kinetic energy of atoms will be :

(bond dissociation energy of the molecule is 246.5 kJ/mol)

1.  12%

2.  8%

3.  26%

4.  17%

Subtopic:  Electromagnetic Radiation |
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For a subatomic particle, the uncertainty in position is same as that of uncertainty in its momentum. The
least uncertainty in its velocity can be given as-

1. V =  h4πm2

2. V = 12πhm

3. V = h2πm

4. V = 12mhπ

Subtopic:  Heisenberg Uncertainty Principle |
 71%
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The quantum number not obtained from Schrodinger’s wave equation is:

1. \(n\) 2. \(l\)
3. \(m\) 4. \(s\)
Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 83%
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Each questions contains STATEMENT-1 (Assertion) and STATEMENT2- (Reason).

Examine the statements carefully and mark the correct answer according to the instructions given below:

Statement-1: Orbital having xz plane as node may be 3dxy.

Statement-2: 3dxy has zero radial node.

1.  If both the statement are true and statement -2 is the correct explanation of statement-1

2.  If both the statements are true but statement-2 is not the correct explanation of statement-1

3.  If statement-1 is true and statement-2 is false

4.  If statement-1 is false and statement-2 is true

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Nodal Plane |
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