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Why is the separation of lanthanoid elem...

Why is the separation of lanthanoid elements difficult?

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(a) Separation of lanthanide elements is difficult. Explain. (b) Sm^(2+), Eu^(2+) and Yb^(2+) ions in solutions are good reducing agents but an aqueous solution of Ce^(4+) is a good oxidising agent. Why?

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Describe the factors on which the stability of an oxidation state of lanthanoid elements depends.

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What are the characterstics of the transition elements and why are they called transition elements ? Which of the d-block elements may not be regarded as the transition elements ?

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