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$\text{2H2SO4 đặc+Cu$\rightarrow$CuSO4+SO2+2H2O}$
$\text{SO2+K2O$\rightarrow$K2SO3}$
$\text{K2SO3+2HCl$\rightarrow$2KCl+H2O+SO2↑}$
$\text{2SO2+O2$\xrightarrow{t^o}$2SO3}$
$\text{SO3+H2O$\rightarrow$H2SO4}$
$\text{H2SO4+CuSO3$\rightarrow$CuSO4+H2O+SO2↑}$
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