MCQ
Acidified $KMnO_4$ can be decolourised by
- A$SO_2$
- B$H_2O_2$
- C$FeSO_4$
- ✓All of the above
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$P = [Ne]\, 3s^23p^3$
$Q = [Ar]\,3d^{10}4s^24p^3$
$R = [He]\,2s^22p^5$
$S = [Ne]\,3s^1$
Incorrect statements is