3SO2( g)+K2Cr2O7(aq)+H2SO4(aq)→K2SO4(aq)+Cr2(SO4)3(aq)+H2O(l)3 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{K}_{2} \mathrm{SO}_{4}(\mathrm{aq})+\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})3SO2( g)+K2Cr2O7(aq)+H2SO4(aq)→K2SO4(aq)+Cr2(SO4)3(aq)+H2O(l)
Cu(s)+2H2SO4(l)→CuSO4 (aq) +2H2O(l)+SO2( g)\mathrm{Cu}(\mathrm{s})+2 \mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{l}) \rightarrow \mathrm{CuSO}_{4} \text { (aq) }+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{SO}_{2}(\mathrm{~g})Cu(s)+2H2SO4(l)→CuSO4 (aq) +2H2O(l)+SO2( g)
Pb(CH3COO)2(aq)+H2 S( g)→2CH3COOH(aq)+PbS(s)+H2O(l)\mathrm{Pb}\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{~S}(\mathrm{~g}) \rightarrow 2 \mathrm{CH}_{3} \mathrm{COOH}(\mathrm{aq})+\mathrm{PbS}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})Pb(CH3COO)2(aq)+H2 S( g)→2CH3COOH(aq)+PbS(s)+H2O(l)
Al2O3( s)+2NaOH(aq)→2NaAlO2 (aq) +H2O(l)\mathrm{Al}_{2} \mathrm{O}_{3}(\mathrm{~s})+2 \mathrm{NaOH}(\mathrm{aq}) \rightarrow 2 \mathrm{NaAlO}_{2} \text { (aq) }+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})Al2O3( s)+2NaOH(aq)→2NaAlO2 (aq) +H2O(l)
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