Kemija - 2021. jesen, 18.

A. $\mathrm{AgNO}_{3}(\mathrm{aq})+\mathrm{KCl}(\mathrm{aq}) \rightarrow \mathrm{AgCl}(\mathrm{s})+\mathrm{KNO}_{3}(\mathrm{aq})$

B. ${\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{l}}_2(\mathrm{a}\mathrm{q})+{\mathrm{N}\mathrm{a}}_2{\mathrm{C}\mathrm{O}}_3(\mathrm{a}\mathrm{q})\to {\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{O}}_3(\mathrm{s})+2\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}(\mathrm{a}\mathrm{q})\backslash mathrm\{CaCl\}\_\{2\}(\backslash mathrm\{aq\})+\backslash mathrm\{Na\}\_\{2\}\; \backslash mathrm\{CO\}\_\{3\}(\backslash mathrm\{aq\})\; \backslash rightarrow\; \backslash mathrm\{CaCO\}\_\{3\}(\backslash mathrm\{s\})+2\; \backslash mathrm\{~NaCl\}(\backslash mathrm\{aq\})$

C. $\mathrm{P}\mathrm{b}{\left({\mathrm{N}\mathrm{O}}_3\right)}_2(\mathrm{a}\mathrm{q})+{\mathrm{N}\mathrm{a}}_2\mathrm{S}(\mathrm{a}\mathrm{q})\to \mathrm{P}\mathrm{b}\mathrm{S}(\mathrm{s})+2{\mathrm{N}\mathrm{a}\mathrm{N}\mathrm{O}}_3(\mathrm{a}\mathrm{q})\backslash mathrm\{Pb\}\backslash left(\backslash mathrm\{NO\}\_\{3\}\backslash right)\_\{2\}(\backslash mathrm\{aq\})+\backslash mathrm\{Na\}\_\{2\}\; \backslash mathrm\{~S\}(\backslash mathrm\{aq\})\; \backslash rightarrow\; \backslash mathrm\{PbS\}(\backslash mathrm\{s\})+2\; \backslash mathrm\{~NaNO\}\_\{3\}(\backslash mathrm\{aq\})$

D. $3\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}(\mathrm{a}\mathrm{q})+{\mathrm{H}}_3{\mathrm{P}\mathrm{O}}_4(\mathrm{a}\mathrm{q})\to 3{\mathrm{H}}_2\mathrm{O}(\mathrm{\ell })+{\mathrm{N}\mathrm{a}}_3{\mathrm{P}\mathrm{O}}_4(\mathrm{a}\mathrm{q})3\; \backslash mathrm\{~NaOH\}(\backslash mathrm\{aq\})+\backslash mathrm\{H\}\_\{3\}\; \backslash mathrm\{PO\}\_\{4\}(\backslash mathrm\{aq\})\; \backslash rightarrow\; 3\; \backslash mathrm\{~H\}\_\{2\}\; \backslash mathrm\{O\}(\backslash ell)+\backslash mathrm\{Na\}\_\{3\}\; \backslash mathrm\{PO\}\_\{4\}(\backslash mathrm\{aq\})$