MCQ
The property seen in f-block elements is:
- ALanthanoid contraction.
- BActinide contraction.
- CBoth (A) and (B).
- DLanthanoid expansion.
Explanation:
The property seen in f-block elements are Lanthanoid contraction and Actinide contraction. Lanthanide contraction is a term used in chemistry to describe the greater than expected decrease in ionic radii of the elements in the lanthanide series.
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$Mn^{2+} +2e- \rightarrow Mn;\, E^o = -1.18\,V$
$2(Mn^{3+} +e^- \rightarrow Mn^{2+} )\,;\,E^o=+1.51\,V$
The $E^o$ for $3Mn^{2+} \rightarrow Mn+ 2Mn^{3+}$ will be :
(Nearest integer)
Given, molar mass of $KCl$ is $74.5 g mol ^{-1}$