MCQ
The following has zero valency
- ASodium
- BBeryllium
- CAluminium
- ✓Krypton
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Reason : $SO_2$ is a reducing agent
$(a)\, IP$ of $O_{(g)}$ is less than $IP$ of $O_{(g)}^ - $
$(b)\, IP$ of $Ne_{(g)}$ is greater than $IP$ of $Ne_{(g)}^ + $
$(c)\, EA$ of $O_{(g)}^ + $ is greater than $EA$ of $O_{(g)}$
$(d)\, IP$ of $N_{(g)}$ is greater than $IP$ of $N_{(g)}^ + $
$E_{{A^{3 + }}/A}^o = 1.50\,\,V\,,$ $E_{{B^{2 + }}/B}^o = 0.3\,\,V,$
$E_{{C^{3 + }}/C}^o = - \,0.74\,\,V,$ $E_{{D^{2 + }}/D}^o = - \,2.37\,\,V.$
The correct sequence in which the various metals are deposited at the cathode is