MCQ
When an aqueous solution of sodium chloride is electrolysed using platinum electrodes, the ions discharged at electrodes are
- A$N{a^ \oplus },{H^ \oplus }$
- B$N{a^ \oplus },{Cl^\Theta }$
- ✓${H^\Theta },C{l^\Theta }$
- D$O{H^\Theta },C{l^\Theta }$
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(Use $R =8.31\, J\, K ^{-1}\, mol ^{-1} ; \log 2=0.3010$. In $10=$ $2.3, \log 3=0.477$ )
$S_2O_8^{2-} + 2e^- \longrightarrow 2SO_4^{2-}$
$Mn^{2+} + 4H_2O \longrightarrow MnO_4 + 8H^+ + 5e^-$
How many moles of $S_2O_8^{2-}$ are required to oxidise $1\, mole$ of $Mn^{ 2+}$ ?