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प्रश्न
State a reason for the following:
La(OH)3 is more basic than Lu(OH)3.
उत्तर
Lanthanide contraction reduces the size of lanthanide ions from La3+ to Lu3+, increasing the covalent character of hydroxides and decreasing basic strength. La(OH)3 is most basic and Lu(OH)3 is least basic.
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संबंधित प्रश्न
What are chemical twins? Write ‘two’ examples.
What are lanthanoids?
Which among the following pairs of elements is 'not' an example of chemical twins?
Account for the following :
Zr and Hf have almost similar atomic radii.
The chemistry of the actinoid elements is not so smooth as that of the Lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.
Write the electronic configurations of the elements with the atomic numbers 61, 91, 101 and 109.
What is Lanthanoid contraction?
On the basis of Lanthanoid contraction, explain the following:
Radii of 4d and 5d block elements.
In lanthanoid the last electron enters (n - 2)f subshell where n is equal to ______.
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of _______.
