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
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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?
- They have high melting points in comparison to pure metals.
- They are very hard.
- They retain metallic conductivity.
- They are chemically very reactive.
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Ans: 4. They are chemically very reactive.
Explanation:
Interstitial compounds are chemically inert.
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Q8. The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only
magnetic moment value of Cr3+ ion is _.
- 2.87 B.M.
- 3.87 B.M.
- 3.47 B.M.
- 3.57 B.M.
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Ans: 2. 3.87 B.M.
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Ans: 2. It has a tendency to attain noble gas configuration
- It has a tendency to attain f configuration
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Q16. Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show
similar physical and chemical properties because _.
- Both belong to d-block.
- Both have same number of electrons.
- Both have similar atomic radius.
- Both belong to the same group of the periodic table.
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Ans: 3. Both have similar atomic radius.
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Q18
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Q19. Which of the following lanthanoids show +2 oxidation state besides the characteristic oxidation state +3 of
lanthanoids?
- Ce
- Eu
- Yb
- Ho
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Q20.
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