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प्रश्न
Account for the following:
Zn, Cd and Hg are soft metals.
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उत्तर
Zn, Cd and Hg are soft metals due to absence of any unpaired electrons resulting weak metal-metal bonding.
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संबंधित प्रश्न
Define lanthanoid contraction.
Which among the following pairs of elements is 'not' an example of chemical twins?
What are the different oxidation states exhibited by the lanthanoids?
The f-block elements are known as ____________.
Which of the following lanthanoids show +2 oxidation state besides the characteristic oxidation state +3 of lanthanoids?
(i) \[\ce{Ce}\]
(ii) \[\ce{Eu}\]
(iii) \[\ce{Yb}\]
(iv) \[\ce{Ho}\]
Although +3 is the characteristic oxidation state for lanthanoids but cerium also shows +4 oxidation state because:
(i) it has variable ionisation enthalpy
(ii) it has a tendency to attain noble gas configuration
(iii) it has a tendency to attain f 0 configuration
(iv) it resembles Pb4+
On the basis of Lanthanoid contraction, explain the following:
Nature of bonding in \[\ce{La2O3}\] and \[\ce{Lu2O3}\] .
State a reason for the following:
La(OH)3 is more basic than Lu(OH)3.
Mention uses of alloys.
The pair of lanthanoid ions which are diamagnetic is:
