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The d-And-f-Block Elements

Short Answer Type

241.

Assign reasons for the following:
Transition metals and their many compounds act as good catalyst.

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242.

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

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243. The E° value for the Mn³⁺/Mn²⁺ couple is much more positive than that for Cr³⁺/Cr²⁺ or Fe³⁺/Fe²⁺? Explain.

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244.
Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as a transition element.

Electronic configuration of Scandium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹ 4s².
On the basis of incompletely filled 3d orbital in case of scandium atom in its ground state (3d¹), it is regarded as a transition element.

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245.

What may be the possible oxidation states of the transition metals with the following d electronic configurations in the ground state of their atoms: 3d³4s²,3d⁵4s² and 3d⁶4s². Indicative relative stability of oxidation states in each case.

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