Kemija - 2017. jesen, 19.

A. ${\mathrm{M}\mathrm{g}\mathrm{C}\mathrm{l}}_2(\mathrm{a}\mathrm{q})+2{\mathrm{A}\mathrm{g}\mathrm{N}\mathrm{O}}_3(\mathrm{a}\mathrm{q})\to \mathrm{M}\mathrm{g}{\left({\mathrm{N}\mathrm{O}}_3\right)}_2(\mathrm{a}\mathrm{q})+2\mathrm{A}\mathrm{g}\mathrm{C}\mathrm{l}(\mathrm{s})\backslash mathrm\{MgCl\}\_\{2\}(\backslash mathrm\{aq\})+2\; \backslash mathrm\{~AgNO\}\_\{3\}(\backslash mathrm\{aq\})\; \backslash rightarrow\; \backslash mathrm\{Mg\}\backslash left(\backslash mathrm\{NO\}\_\{3\}\backslash right)\_\{2\}(\backslash mathrm\{aq\})+2\; \backslash mathrm\{~AgCl\}(\backslash mathrm\{s\})$

B. $\mathrm{F}\mathrm{e}\mathrm{S}(\mathrm{s})+2\mathrm{H}\mathrm{C}\mathrm{l}(\mathrm{a}\mathrm{q})\to {\mathrm{F}\mathrm{e}\mathrm{C}\mathrm{l}}_2(\mathrm{a}\mathrm{q})+{\mathrm{H}}_2\mathrm{S}(\mathrm{g})\backslash mathrm\{FeS\}(\backslash mathrm\{s\})+2\; \backslash mathrm\{~HCl\}(\backslash mathrm\{aq\})\; \backslash rightarrow\; \backslash mathrm\{FeCl\}\_\{2\}(\backslash mathrm\{aq\})+\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{S\}(\backslash mathrm\{g\})$

C. $\mathrm{CaCO}_{3}(\mathrm{s}) \rightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{g})$

D. $2{\mathrm{N}\mathrm{a}\mathrm{N}\mathrm{O}}_3(\mathrm{s})\to 2{\mathrm{N}\mathrm{a}\mathrm{N}\mathrm{O}}_2(\mathrm{s})+{\mathrm{O}}_2(\mathrm{g})2\; \backslash mathrm\{~NaNO\}\_\{3\}(\backslash mathrm\{s\})\; \backslash rightarrow\; 2\; \backslash mathrm\{~NaNO\}\_\{2\}(\backslash mathrm\{s\})+\backslash mathrm\{O\}\_\{2\}(\backslash mathrm\{g\})$