Cái đầu đúng
2 cái sau sai
PTHH:2 K+2HCl---->2KCl+H2
BaO+2HCl---->BaCl2+H2O
Fe(OH)2+2HCl---->FeCl2+2H2O
-Ý 1: đúng.
\(\text{K+2HCl=KCl+H2}\)
\(\text{K+H2O=KOH+1/2H2 ( nếu dư K)}\)
\(\text{BaO+2HCl=BaCl2+H2O}\)
\(\text{BaO+H2O=Ba(OH)2 ( nếu dư BaO)}\)
\(\text{Fe(OH)2+2HCl=FeCl2+2H2O}\)
-Ý 2: sai. SO3 ko td.
\(\text{K+H2O=KOH+1/2H2}\)
\(\text{2KOH+CuSO4=K2SO4+Cu(OH)2}\)
BaO+H2O=Ba(OH)2
Ba(OH)2+CuSO4=BaSO4+Cu(OH)2
-Ý 3: đúng
K+H2O=KOH+1/2H2
2KOH+2AgNO3=2KNO3+Ag2O+H2O
BaO+H2O=Ba(OH)2
Ba(OH)2+2AgNO3=Ba(NO3)2+Ag2O+ H2O