- AAltered reaction in presence of ${H_2}O$
- ✓Electrochemical phenomenon
- CInteraction
- DUnion between light metal and heavy metal
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$A.$ During charging of battery, $PbSO _4$ on anode is converted into $PbO _2$
$B.$ During charging of battery, $PbSO _4$ on cathode is converted into $PbO _2$
$C.$ Lead storage battery, consists of grid of lead packed with $PbO _2$ as anode
$D.$ Lead storage battery has $\sim 38 \%$ solution of sulphuric acid as an electrolyte
Choose the correct answer from the options given below:



$(I)\,[Kr]\,5s^1$ $(II)\, [Rn]\,5f^{14}\,6d^1\,7s^2$
$(III)\,[Ar]\,3d^{10}\,4s^2\,4p^5$ $(IV)\,[Ar]\,3d^6\,4s^2$
Consider the following Statements
$(i)\, I$ shows variable oxidation State
$(ii)\, II$ is a $d-block$ element
$(iii)$ The compound formed between $I$ and $III$ is covalent
$(iv)\,IV$ shows single oxidation state
Which Statement is True $(T)$ or False $(F)$?