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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.

(i) Mischmetal (an alloy) is used in gas lighters, tracer bullets and shell.
(ii) Oxides of neodymium and praseodymium are used for making colour glasses.

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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.

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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

105. Give two uses of lanthanoid compounds.

105.
Give two uses of lanthanoid compounds.