The d-And-f-Block Elements

Short Answer Type

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Why lanthanoid ions are coloured?

Due to f-f transition of unpaired electrons present in partly filled f-orbitals.
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    In permagnate ion, all the bonds formed between Mn and O are covalent. Give reasons.

     
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    Why lanthanoids are called f-block elements?
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    The size of the trivalent cations in the lanthanoid series decrease steadily as the atomic number increases. What is this known as?
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    Give two uses of lanthanoid compounds.

     
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    What is the composition of mischmetal alloy?

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    What is the range of E° value of lanthanoids for Ln3+/Ln?
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    What is the electronic configuration difference between lanthanoids and actinoids?
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    What is the maximum oxidation state shown by actinoids?

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    In actinides last electron goes to which subshell?
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