couple
is much more positive than the lanthanoid contraction. 1
(iii)
The enthalpies of atomisation of transition elements are high.
1
(b)
State the probable oxidation states of the transition metals with the following
configuration in their ground state: 2
(i)
(ii)
(iii)
(iv)
.
Answer:
(a)
(i) The transition metal and their compounds acts as good catalyst because of
their ability of adopt multiple oxidation states and to form
complexes. 1
(ii)
The E° values for
couple
is much more positive is due to the much larger third ionization energy of 
(where
the required change is
).
1
(iii)
Enthalpies of atomization of transitional metals are very high due to:
(I)Metallic
bond forces among the atoms of transition metals.
(II)
Covalent bond forces resulting by mutual d-d overlapping. 1
(b)
Ground
state
Problem
oxidation states
+3,+4
+2,+3,+4,+5,+6
+3,+4,+5,+6
+3,+4
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