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Chemistry
For d block elements the first ionization potential is of the order :
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Q. For $ d $ block elements the first ionization potential is of the order :
UPSEE
UPSEE 2005
A
$ Zn > Fe >Cu > Cr $
B
$ Sc = Ti < V = Cr $
C
$ Zn < Cu < Ni < Co $
D
$ V > Cr > Mn > Fe $
Solution:
The ionisation energies increase with increase with atom number. The trend is irregular among $d$ -block elements.
$\begin{matrix}{\text{Element}}&Sc&Ti&V&Cr&Mn&Fe&Co&Ni&Cu&Zn\\ IE (kj/mol^{-1})&631&656&650&652&717&762&758&736&745&905\end{matrix}$
$\therefore \, Zn >\, Fe >\, Cu >\, Cr$ is correct order