Question

Answer 1

bạn tự cân bằng nhé :v 

a,

MnO2 + HCl (đặc) -> MnCl2 + H2O + Cl2 

Cl2 + NaBr -> NaCl + Br2 

Br2 + NaI -> NaBr + I2 

NaBr + AgNO3 -> NaNO3 + AgBr 

b, 

NaCl + H2SO4 (đặc nóng) -> Na2SO4 + HCl (khí)

MnO2 + HCl (đặc) -> MnCl2 + H2O + Cl2 

Cl2 + KOH (đặc) -> KCl + KClO3 + H2O

KClO3 - (to/xt)> KCl + O2

c,

S + O2 -to> SO2

SO2 + H2S -> S + H2O

S + H2 -to> H2S

H2S + Br2 + H2O -> HBr + H2SO4

H2SO4 + Na2SO3 -> Na2SO4 + H2O + SO2 

SO2 + Br2 + H2O -> HBr + H2SO4

H2So4 + Fe(OH)3 -> Fe2(SO4)3 + H2O