MCQ
The electronic configuration of Gadolinium is
- A$[Xe]6s^2\,\,4f^8$
- B$[Xe] 6s^2\,\, 5d^1\,\, 4f^8$
- ✓$[Xe] 6s^2\,\,5d^1\,\,4f ^7$
- DNone
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Reason : $V_2O_5$ or $Pt$ is used in the preparation of $H_2SO_4$ by contact process.
$Zn \to Z{n^{2 + }} + 2{e^ - };{E^o} = 0.76\,\,V$,$Fe \to F{e^{2 + }} + 2{e^ - };{E^o} = 0.44\,\,V$ what will be the emf of cell, whose cell-reaction is ............ $\mathrm{V}$
$F{e^{2 + }}(aq) + Zn \to Z{n^{2 + }}(aq) + Fe$
Reason : Cerium salts are used as catalyst in petroleum cracking.