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The d-And-f-Block Elements

Short Answer Type

101. What is the range of E° value of lanthanoids for Ln³⁺/Ln?

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102. In actinides last electron goes to which subshell?

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103. Why lanthanoid ions are coloured?

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104.

What is the composition of mischmetal alloy?

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105.

Give two uses of lanthanoid compounds.

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106. What is the electronic configuration difference between lanthanoids and actinoids?

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107. Why lanthanoids are called f-block elements?

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108. 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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109.
In permagnate ion, all the bonds formed between Mn and O are covalent. Give reasons.

In permanganate ion, MnO₄, Mn shows an oxidation state of +7. Because of very large energy requirement, Mn cannot loose 7 electrons, therefore, it forms seven covalent bonds.

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110.

What is the maximum oxidation state shown by actinoids?

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Previous Year Papers

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Test Yourself

Short Answer Type

109. In permagnate ion, all the bonds formed between Mn and O are covalent. Give reasons.

109.
In permagnate ion, all the bonds formed between Mn and O are covalent. Give reasons.