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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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 |
 77%
From NCERT
NEET - 2016
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Two electrons occupying the same orbital are distinguished by

(1) Magnetic quantum number

(2) Azimuthal quantum number

(3) Spin quantum number

(4) Principal quantum number

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 81%
From NCERT
NEET - 2016
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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 |
 57%
From NCERT
NEET - 2016
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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 |
 69%
From NCERT
NEET - 2015
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The number of d-electrons in Fe2+ (Z=26) is not equal to the number of electrons in

which one of the following?

1. s-electrons in Mg (Z=12)

2. p-electrons in Cl (Z=17)

3. d-electrons in Fe (Z=26)

4. p-electrons in Ne (Z=10)

Subtopic:  Shell & Subshell |
 58%
NEET - 2015
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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 |
 78%
From NCERT
NEET - 2015
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Calculate the energy in Joule corresponding to light of wavelength 45 nm : (Planck's

constant h = 6.63 x 10-34 Js; speed of light c = 3 x 108 ms-1)

1. 6.67 x 1015                             

2. 6.67 x 1011

3. 4.42 x10-15                             

4. 4.42 x 10-18

Subtopic:  Planck's Theory |
 75%
From NCERT
NEET - 2014
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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 |
 72%
From NCERT
NEET - 2013
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From the given equation, certain conclusions are drawn.
\(\mathrm{E}=-2.178 \times 10^{-18} \mathrm{(J)} \frac{\mathrm{z}^2}{\mathrm{n}^2} \)
Choose the incorrect statement:

1. The negative sign in the equation implies that the energy of an electron bound to the nucleus is lower than it would be if the electron were at an infinite distance from the nucleus.
2. The larger the value of n, the greater the orbit radius.
3. The equation can be utilized to calculate the change in energy when the electron transitions between orbits.
4. For n=1, the electron has a more negative energy than it does for n=6. This means that the electron is more loosely bound in the smallest allowed orbit.
Subtopic:  Bohr's Theory |
 65%
From NCERT
NEET - 2013
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