The sub-shell that comes after f-sub-sell is called g-subshell. The number of g-sub orbitals in g-sub-shell and the total number of orbitals in the principal orbital respectively are-

1. 10 and 25

2. 9 and 25

3. 11 and 23

4. 15 and 45

Subtopic:  Shell & Subshell |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The wavelengths of two photons are 2000 Å and 4000 Å respectively. What is the ratio of their energies?

1. 1/4

2. 4

3. 1/2

4. 2

Subtopic:  Planck's Theory | Electromagnetic Radiation |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Helium atom can be excited to 1s1, 2p1 configuration by light of 58.44 nm. The lowest excited state with configuration 1s1, 2s1 lies 4857 cm-1 (1/λ) below the 1s1, 2p1 state. What would be the average He - H bond energy so that HeH2 could form, non-endothermically from the lowest excited singlet state of helium? Neglect any difference between G and H and take H as 218 kJ mol-1

1. 1614 kJ mol-1

2. 1212 kJ mol-1

3. 912 kJ mol-1

4. 1511 kJ mol-1

Subtopic:  Bohr's Theory |
 57%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

The number of electrons in one molecule of CO2 are - 

1. 22

2. 44

3. 66

4. 88

Subtopic:  Number of Electron, Proton & Neutron |
 73%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The ion that is isoelectronic with CO is-

1. CN-

2. O2+

3. O2-

4. N2+

Subtopic:  Number of Electron, Proton & Neutron |
 84%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If frequency of the X-rays produced using an element as anti-cathode is found to be 2500 sec-1, the atomic number of used element is (a, b= 1)

1. 51

2. 49

3. 56

4. 72

Subtopic:  Introduction of Atomic Structure |
 50%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

What is the energy required per mole to excite an electron from the third to fifth Bohr orbit in hydrogen ?

1. 6.336 x 106J

2. 7.122 x 104J

3. 0.343 x 106J

4. 9.343 x 104J

Subtopic:  Bohr's Theory |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The energy of electron in first Bohr's orbit of H-atom is -13.6 eV. What will be its potential energy in n = 4.

1. –13.6 eV

2. - 3.4 eV

3. -0.85 eV

4. -1.70 eV

Subtopic:  Bohr's Theory |
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Sodium atoms can be ionised by supplying an energy of 118 kcal mol-1. Using this data, calculate the lowest possible frequency of light that can ionise a sodium atom.

(h = 6.624 x 10-27 erg.sec, c= 3 x 1010 cm sec-1).

1. 1.24 x 1015 sec-1

2. 0.24 x 1015 sec-1 

3. 12.4 x 1012 sec-1

4. 2.31 x 1018 sec-1

Subtopic:  Electromagnetic Radiation |
 52%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

A glow worm of mass 5.0 g emits red light (650 nm) with a power of 0.1 W. entirely in the backward direction. What velocity would it accelerate to after 10 years, if released in free space (and assumed to be alive)?

1. 9.14 ms-1 

2. 28.08 ms-1

3. 11.05 ms-1

4. 21.04 ms-1

Subtopic:  Electromagnetic Radiation |
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints