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The d-And-f-Block Elements

Short Answer Type

31.

Which element shows the highest oxidation state among the d-block elements?

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32. What is the reason of transition elements to exhibit variable oxidation states?

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33. Out of V and Mn which exhibits more oxidation states?

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34.

What is the most stable oxidation state of Mn (Z = 25)?

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35. Write the highest oxidation state shown by element with atomic number 23.

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36.

The electronic configuration of an element is 3d⁵ 4s¹. Write its (i) most stable oxidation state and (ii) most oxidising state.

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37. The electronic configuration of an element is 3d⁵ 4s¹. Write its (i) most stable oxidation states and (ii) most oxidising oxidation state.

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38. What is the highest oxidation state shown by Cr (Z = 24)?

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39. Why are Cr²⁺ reducing and Mn³⁺ oxidising when both have d⁴ configurations?

Cr2⁺ is strongly reducing in nature. It has a d4 configuration. While acting as a reducing agent, it gets oxidized to Cr³⁺ (electronic configuration, d3). This d3 configuration can be written as 3t_2g configuration, which is a more stable configuration.

In the case of Mn³⁺ (d4), it acts as an oxidizing agent and gets reduced to Mn²⁺ (d5). This has an exactly half-filled d-orbital and has an extra-stability.