1b 唔多識
2a 係唔係咁:
KI: 有d OA in air, eg. O2 produce d I2 出黎
之後I2 同I- 玩, produce I3- which is brown in colour
HNO3
conc. HNO3 自己玩decompose: 出 NO2
4HNO3 -> 4NO2+2H2O +O2
KMnO4 係因為出MnO2:
4MnO4- + 2H2O (in air moist?) ->4MnO2 +4OH- +3O2
so difficult,油其係KI 個題