Class 12 Chemistry: d and f Block Elements

This worksheet challenges your understanding of the properties, trends, and applications of d and f block elements, including their electronic configuration, oxidation states, and magnetic behavior.

Class 12CBSEChemistryhardPractice

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Q1. Which of the following elements exhibits the maximum number of oxidation states?
- Mn
- Cr
- V
- Fe
Q2. The lanthanoid contraction is responsible for the fact that:
- Zr and Y have about the same radius.
- Zr and Nb have similar oxidation states.
- Zr and Hf have almost identical atomic and ionic radii.
- Zr and Zn have similar chemical properties.
Q3. Which of the following statements about interstitial compounds is INCORRECT?
- They are chemically inert.
- They are very hard.
- They have higher melting points than the pure metals.
- They retain metallic conductivity.
Q4. KMnO₄ acts as an oxidizing agent in acidic, alkaline, and neutral media. Which of the following statements is true about its oxidizing action?
- It gains 5 electrons in alkaline medium.
- It gains 3 electrons in acidic medium.
- It gains 1 electron in neutral medium.
- It gains 5 electrons in acidic medium.
Q5. Which of the following pairs has both elements with a +3 oxidation state as their most common oxidation state?
- Ti, V
- Cr, Mn
- La, Lu
- Ce, Eu

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