The wavelength of the light emitted when the electron returns to the ground state in the H atom, from n = 5 to n = 1, would be: (The ground-state electron energy is –2.18 × 10-18 j
1. Wavelength = 9.498 x 10-8 km
2. Wavelength = 12.498 x 10-8 m
3. Wavelength = 9.498 x 10-8 m
4. Wavelength = 9.498 x 10-8 cm

Subtopic:  Planck's Theory |
 63%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


The possible values of n, l, and m for the electron present in 3d would be respectively:

1. n = 3, l = 1, m = – 2, – 1, 3, 1, 2

2. n = 3, l = 3, m = – 2, – 1, 0, 1, 2

3. n = 3, l = 2, m = – 2, – 1, 0, 1, 2

4. n = 5, l = 2, m = – 2, – 1, 0, 1, 2

Subtopic:  Shell & Subshell |
 90%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints
Links

To unlock all the explanations of this course, you need to be enrolled.


The number of electrons in the species H2+ , H2 , O2+,  are respectively:

1. 15, 2, 1

2. 15, 1, 2

3. 1, 2, 15

4. 2, 1, 15

Subtopic:  Number of Electron, Proton & Neutron |
 92%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints
Links

To unlock all the explanations of this course, you need to be enrolled.


advertisementadvertisement

Orbital that does not exist:

1. 6p 2. 2s
3. 3f 4. 2p

Subtopic:  Shell & Subshell |
 89%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints
Links

To unlock all the explanations of this course, you need to be enrolled.


The set of quantum numbers which represent 3p is
1. n =1, =0;
2, n
= 3; l=1
3. n
= 4; l =2;
4. n 
= 4; = 3 

Subtopic:  Shell & Subshell |
 93%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


Which of the following sets of quantum numbers is possible-
1. n
= 0, l = 0, ml = 0, ms = + ½
2. n
= 1, l = 0, ml = 0, ms = – ½
3. n
= 1, l = 1, ml = 0, ms = + ½
4. n
= 3, l = 3, ml = –3, ms = + ½

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 83%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


advertisementadvertisement

The total number of electrons in an atom with the following quantum numbers would be
(a) n = 4, ms = – ½  (b) n = 3, l = 0
1. 16,  2
2. 11, 8
3. 16, 8
4. 12, 7

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 81%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


The transition in the hydrogen spectrum that would have the same wavelength as Balmer transition from n = 4 to n = 2 of He+ spectrum is -

1. n1 = 3 to n2 = 4

2. n2  = 3 to n1 = 2

3. n2  = 3 to n1 = 1

4. n2  = 2 to n1 = 1

Subtopic:  Hydrogen Spectra |
 64%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


2 ×108 atoms of carbon are arranged side by side. The radius of a carbon atom if the length of this arrangement is 2.4 cm would be 

1. 7.0 x 10-11 m

2. 5.0 x 10-11 m

3. 8.0 x 10-11 m

4. 6.0 x 10-11 m

Subtopic:  Introduction of Atomic Structure |
 71%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.


advertisementadvertisement

The diameter of a zinc atom is 2.6 Å. If zinc atoms are arranged side by side lengthwise, number of atoms present in a length of 1.6 cm would be:

1. 5.153 x 107 2. 6.153 x 107
3. 4.153 x 109 4. 6.153 x 103
Subtopic:  Introduction of Atomic Structure |
 77%
From NCERT

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.