A. CO2(g)+2 NaOH(aq)→Na2CO3(aq)+H2(g)+1/2 O2(g)\mathrm{CO}_{2}(\mathrm{g})+2 \mathrm{~NaOH}(\mathrm{aq}) \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{g})+1/2 \mathrm{~O}_{2}(\mathrm{g})CO2(g)+2 NaOH(aq)→Na2CO3(aq)+H2(g)+1/2 O2(g)
B. Na2CO3(s)+Ca(OH)2(aq)→CaCO3(s)+2 NaOH(aq)\mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{s})+\mathrm{Ca}(\mathrm{OH})_{2}(\mathrm{aq}) \rightarrow \mathrm{CaCO}_{3}(\mathrm{s})+2 \mathrm{~NaOH}(\mathrm{aq})Na2CO3(s)+Ca(OH)2(aq)→CaCO3(s)+2 NaOH(aq)
C. CO2(g)+2 NaOH(aq)→Na2CO3(aq)+H2O(ℓ)\mathrm{CO}_{2}(\mathrm{g})+2 \mathrm{~NaOH}(\mathrm{aq}) \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\ell)CO2(g)+2 NaOH(aq)→Na2CO3(aq)+H2O(ℓ)
D. Na2O(s)+H2O(ℓ)→2 NaOH(aq)\mathrm{Na}_{2} \mathrm{O}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\ell) \rightarrow 2 \mathrm{~NaOH}(\mathrm{aq})Na2O(s)+H2O(ℓ)→2 NaOH(aq)
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