Phản ứng oxi hoá khử , giúp mình với ạ. 6, KClO3 + HBr ___ KCl + Br2 + H2O 7, H2S + HNO3 ___ H2SO4 + NO + H2O 8, Br2 + Cl2 + H2O ____ HBrO3 + HCl 9, HBr + H2SO4 (đặc) _____ SO2 + Br2 + H2O 10, HI + H2SO4(đ) _____ H2S + I2 + H2O 11, P + HNO3(loãng) + H2O ____ H3PO4 + NO 12, P + H2SO4(đ) _____ H3PO4 + SO2 + H2O
1 câu trả lời
6. Cl+5 +6e->Cl- .1
2Br- ->Br2+2e .3
->KClO3 + 6HBr ->KCl + 3Br2 + 3H2O
7. S-2 ->S+6 +8e .3
N+5 +3e->N+2 .8
-> 3H2S + 8HNO3 -> 3H2SO4 + 8NO + 4H2O
8. Cl2+2e ->2Cl- .5
Br2->2Br+5 +10e .1
->Br2 + 5Cl2 + 6H2O ->2HBrO3 + 10HCl
9. 2Br-1 ->Br2+2e
S+6 +2e ->S+4
->2HBr + H2SO4 (đặc) -> SO2 + Br2 + 2H2O
10. 2I- ->I2 +2e .4
S+6 +8e->S-2
->8HI + H2SO4(đ) ->H2S + 4I2 + 4H2O
11. P ->P+5 +5e .3
N+5 +3e->N+2 .5
->3P + 5HNO3(loãng) + 2H2O -> 3H3PO4 + 5NO
12. P ->P+5 +5e .2
S+6 +2e->S+4 .5
->2P + 5H2SO4(đ) -> 2H3PO4 + 5SO2 + 2H2O