NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions
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Question : 37
Total: 49
Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.
Solution:
(i) In first transition series lower oxidation state is more stablewhereas in heavier transition elements higher oxidation states are morestable.
(ii) The ionisation enthalpy of 5d transition series is higher than 3d and 4dtransition series.
(iii) M–M bonding is most common in heavier transition metals but less infirst series.
(iv) The elements of first transition series do not form complexes withhigher coordination number of 7 and 8.
(v) The elements of first series can form high spin or low spin complexesdepending upon strength of ligands but elements of other series form lowspin complexes irrespective of strength of ligands.
(ii) The ionisation enthalpy of 5d transition series is higher than 3d and 4dtransition series.
(iii) M–M bonding is most common in heavier transition metals but less infirst series.
(iv) The elements of first transition series do not form complexes withhigher coordination number of 7 and 8.
(v) The elements of first series can form high spin or low spin complexesdepending upon strength of ligands but elements of other series form lowspin complexes irrespective of strength of ligands.
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