Explore topic-wise MCQs in Chemistry.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

The ultraviolet spectral region is obtained in Balmer series.

A. True
B. False
Answer» C.
Discussion
2.

Find out the wavenumber, when an electron jumps from 2nd orbit to 1st.

A. 82357.75 cm<sup>-1</sup>
B. 105,677 cm<sup>-1</sup>
C. 82257.75 cm<sup>-1</sup>
D. 109,677 cm<sup>-1</sup>
Answer» D. 109,677 cm<sup>-1</sup>
Discussion
3.

When an electron jumps from 3rd orbit to 2nd orbit, which series of spectral lines are obtained?

A. Balmer
B. Lyman
C. Paschen
D. Brackett
Answer» B. Lyman
Discussion
4.

A metal s work function is 3.8KJ. Photons strike metal s surface with an energy of 5.2 KJ. what s the kinetic energy of the emitted electrons?

A. 3.8 KJ
B. 5.2 KJ
C. 9 KJ
D. 1.4 KJ
Answer» E.
Discussion
5.

________ frequency, is the minimum frequency required to eject an electron when photons hit the metal surface.

A. Required
B. Activated
C. Threshold
D. Limiting
Answer» D. Limiting
Discussion
6.

If Energy = 4.5 KJ; calculate the wavelength.

A. 4.42 x 10<sup>-29</sup> m
B. 4.42 x 10<sup>-39</sup> m
C. 4.42 x 10<sup>-25</sup> m
D. 4.42 x 10<sup>-22</sup> m
Answer» B. 4.42 x 10<sup>-39</sup> m
Discussion
7.

Calculate the frequency of the wave whose wavelength is 10nm.

A. 2 Hz
B. 3 Hz
C. 1 Hz
D. 4 Hz
Answer» C. 1 Hz
Discussion
8.

What is the wavenumber of violet color?

A. 25 x 10<sup>3</sup> mm<sup>-1</sup>
B. 25 x 10<sup>3</sup> m<sup>-1</sup>
C. 25 x 10<sup>3</sup> cm<sup>-1</sup>
D. 25 x 10<sup>3</sup> nm<sup>-1</sup>
Answer» D. 25 x 10<sup>3</sup> nm<sup>-1</sup>
Discussion
9.

What s the wavelength for the visible region in electromagnetic radiation?

A. 400 750 nm
B. 400 750 mm
C. 400 750 m
D. 400 750 pm
Answer» B. 400 750 mm
Discussion