Class 12 The D and F-block Elements MCQs with Answer

Class 12 chemistry MCQs with answers are provided here for chapter The d & f Block Elements. The d-block of the periodic table contains the elements of the groups 3-12 in which the d orbitals are progressively filled in each of the four long periods. The f-block consists of elements in which 4 f and 5 f orbitals are progressively filled. They are placed in a separate panel at the bottom of the periodic table.

Class 12 The D and F-block Elements MCQs with Answer

Q3. Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the
following is not the characteristic property of interstitial compounds?

1. They have high melting points in comparison to pure metals.
2. They are very hard.
3. They retain metallic conductivity.
4. They are chemically very reactive.

Q8. The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only
magnetic moment value of Cr³⁺ ion is _.

1. 2.87 B.M.
2. 3.87 B.M.
3. 3.47 B.M.
4. 3.57 B.M.

Q16. Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show
similar physical and chemical properties because _.

1. Both belong to d-block.
2. Both have same number of electrons.
3. Both have similar atomic radius.
4. Both belong to the same group of the periodic table.

Q18

Q19. Which of the following lanthanoids show +2 oxidation state besides the characteristic oxidation state +3 of
lanthanoids?

1. Ce
2. Eu
3. Yb
4. Ho

Q20.