Question

Which of the following compounds can be oxidised further with a strong oxidising agent?

• A. $Cr{O}_3$
• B. ${Al}_2{O}_3$
• C. $S{O}_2$
• D. $Mn{O}_3$

Answer 1

Answer: (C), (D)

$Mn{O}_3$
$S{O}_2$

a. $\stackrel{+6}{Cr}{O}_3$ (Maximum oxidation state, cannot be oxidised further)
b. $\stackrel{+3}{{Al}_2}{O}_3$ (Maximum oxidation state, cannot be oxidised further)
c. $\stackrel{+4}{S}{O}_2⟶\stackrel{+6}{{SO}_4^{2-}}$ (Can be oxidised further)
d. $\stackrel{+6}{Mn}{O}_3⟶\stackrel{+7}{Mn}{O}_4^{\ominus }$ (Can be oxidised further)
Hence, $S{O}_2$ and $Mn{O}_3$ can be further oxidised.