CHEM高手請~~~

1) displacement 上面有人講左~

2) 其實S 既redox 黎黎去去都係+4同+6，所以S 既ON 最高可以去到既ON 係+6，而最低係去到+4
-SO2->SO4^-2 's ON increases from +4 to +6
SO2 can't changes to SO3^-2 as both ON is +4
so, SO2 MUST be RA.
-SO3^-2->SO4-2 's ON increases from +4 to +6
so ,it MUST be RA.
-SO4-2 ->SO2 is OA as ON decreases frpm +6 to +4
so it is OA
SO4^-2 also can changes from S2O8^-2
而SO4-2 係一種VERY WEAK 既RA from ECS，所以reaction 係冇乜機會用到，可以不理。
但你如果係CE lvl 既學生，應該冇乜試過用上面個條equation，所以可不背。
p.s. 其實我都係今年CE 學生，所以知既係咁多。。^^