Pick out the incorrect statement
1
MnO2 dissolves in conc. HCl, but does not form Mn4+ ions
2
MnO2 oxidizes hot concentrated H2SO4 liberating oxygen
3
K2MnO4 is formed, when MnO2 in fused KOH is oxidized by air, KNO3, PbO2 or NaBiO3
4
Decomposition of acidic KMnO4 is not catalysed by sunligh
5
Question Not Attempted