Đáp án:
AXIT: 2HCl+ Ba => BaCl2 + H2
h2so4 + mgcl2=>mgso4 + 2hcl
OXIT: so2 +h2o=>h2so3
2naoh + co2=> na2co3 + h2o
Bazơ : 2naoh + h2so4=> na2so4 + 2h2o
ba(oh)2+ cuso4=> cu(oh)2 + baso4
Muối: cucl2 + 2naoh=> 2nacl + cu(oh)2
fes2+ 2hcl=> fecl2 + h2s
Phi kim: h2 + cl2=> 2hcl
s+ o2 t*=> so2
Kim loại: 2na + 2h2o=> 2naoh + h2
ba + h2so4=> baso4 + h2