Question 1: Palette 1/12

BITSAT 2025 MCQ

The degeneracy of a hydrogen atom whose energy equals $-R_{\mathrm{H}}$ / 16

A

8

B

9

C

16

D

10

Question 2: Palette 2/12

BITSAT 2025 MCQ

If the de-Broglie wavelength of a particle is equal to $10 \sqrt{h / m}$, then what is the ratio of its speed to mass?

A

$\frac{h^2}{10 m^{3 / 2}}$

B

$\frac{\sqrt{h}}{10 \sqrt{m}}$

C

$\frac{h}{100 \sqrt{m}}$

D

$\frac{\sqrt{h}}{m^{3 / 2} 10}$

Question 3: Palette 3/12

BITSAT 2024 MCQ

The degeneracy of hydrogen atom that has energy equal to $ \frac{-R_{\mathrm{H}}}{9} $ is (where, $ R_{\mathrm{H}}= $ Rydberg constant)

A

6

B

8

C

5

D

9

Question 4: Palette 4/12

BITSAT 2024 MCQ

If the de-broglie wavelength of a particle of mass $ (m) $ is 100 times its velocity. Then, its value in terms of its mass $ (m) $ and plank constant $ (h) $ is

A

$ \frac{1}{10} \sqrt{\frac{m}{h}} $

B

$ 10 \sqrt{\frac{h}{m}} $

C

$ \frac{1}{10} \sqrt{\frac{h}{m}} $

D

$ 10 \sqrt{\frac{m}{h}} $

Question 5: Palette 5/12

BITSAT 2023 MCQ

Which of the following statements does not form a part of Bohr's model of hydrogen atom?

A

The position and velocity of the electrons in the orbit cannot be determined simultaneously.

B

The electron in the orbit nearest the nucleus has the lowest energy.

C

Electrons revolve in different orbits around the nucleus.

D

Energy of the electrons in the orbit is quantised.

Question 6: Palette 6/12

BITSAT 2022 MCQ

Which one of the following statements in relation to the hydrogen atom is correct?

A

3s, 3p and 3d-orbitals all have the same energy.

B

3s and 3p-orbitals are of lower energy than 3d-orbital.

C

3p-orbital is lower in energy than 3d-orbital.

D

3s-orbital is lower in energy than 3p-orbital.

Question 7: Palette 7/12

BITSAT 2021 MCQ

What is the magnetic moment of Ti²⁺ ? (Given : Atomic number = 22)

A

$\sqrt8$

B

$\sqrt{10}$

C

$\sqrt6$

D

$\sqrt9$

Question 8: Palette 8/12

BITSAT 2021 MCQ

If Rydberg constant is same for all elements, the angular momentum and energy of Li²⁺ of which orbital is equal to angular momentum and energy of 1 s-orbital of hydrogen atom?

A

3s

B

4s

C

2p

D

3d

Question 9: Palette 9/12

BITSAT 2021 MCQ

Ionisation energy for H⁺ ion is proportional to rⁿ, then value of n is

A

1

B

$-$1

C

2

D

$-$2

Question 10: Palette 10/12

BITSAT 2021 MCQ

Rutherford model could not explain

A

electronic structure of an atom

B

stability of an atom

C

Both (a) and (b)

D

None of the above

Question 11: Palette 11/12

BITSAT 2020 MCQ

Ionisation energy of H-atom is 13.6 eV. The wavelengths of the spectral line emitted when an electron in Be³⁺ comes them 5th energy level to 2nd energy level is

A

43.5 nm

B

4350 nm

C

4.35 nm

D

435 nm

Question 12: Palette 12/12

BITSAT 2020 MCQ

If the quantum number I could have the value 'n' also then, Sc(21) would have electronic configuration as (other rules strictly followed)

A

1s² 1p⁶ 2s² 2p⁶ 2d³ 3s²

B

1s² 1p⁶ 2s² 2p⁶ 3s² 2d³

C

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹ 4s²

D

1s² 2s² 2p⁶ 3s² 3p⁶ 3d³