Đáp án:
A/
H2SO4 + CuO --> CuSO4 + H2O
CuSO4 + 2NaOH --> Na2SO4 + Cu(OH)2
Cu(OH)2$\buildrel{{t^o}}\over\longrightarrow$ CuO + H2O
CuO + HCl --> CuCl2 + H2O
CuCl2 + 2AgNO3 --> 2AgCl + Cu(NO3)2
Cu(NO3)2 +Mg --> Mg(NO3)2 +Cu
b/
Ca + 2H2O --> Ca(OH)2 + H2
Ca(OH)2 + 2HCl --> CaCl2 + H2O
CaCl2 + Na2CO3 --> 2NaCl + CaCO3
2NaCl + 2H2O $\buildrel{{đpdd, cmn}}\over\longrightarrow$ 2NaOH + Cl2 + H2
NaOH + SO3 --> NaHSO4
Giải thích các bước giải:
