Write balanced equations for each of the following by inserting the correct coefficients in the blanks:

1. $\mathbf{\_Cu}{\left({\mathrm{NO}}_3\right)}_{\mathbf{2}}\left(\mathrm{aq}\right)\mathbf{+}\mathbf{\_KOH}\left(\mathrm{aq}\right)\mathbf{\to }\mathbf{\_Cu}{\left(\mathrm{OH}\right)}_{\mathbf{2}}\left(s\right)\mathbf{+}{\mathbf{\_KNO}}_{\mathbf{3}}\left(\mathrm{aq}\right)$
2. ${\mathbf{\_BCl}}_{\mathbf{3}}\left(g\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(l\right)\mathbf{\to }{\mathbf{\_H}}_{\mathbf{3}}{\mathbf{BO}}_{\mathbf{3}}\left(s\right)\mathbf{+}\mathbf{\_HCl}\left(g\right)$
   
3. ${\mathbf{\_CaSiO}}_{\mathbf{3}}\left(s\right)\mathbf{+}\mathbf{\_HF}\left(g\right)\mathbf{\to }{\mathbf{\_SiF}}_{\mathbf{4}}\left(g\right)\mathbf{+}{\mathbf{\_CaF}}_{\mathbf{2}}\left(s\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(l\right)$
   
4. $\mathit{\_}{\left(\mathrm{CN}\right)}_{\mathbf{2}}\left(g\right)\mathbf{+}\mathit{\_}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}\left(l\right)\mathbf{\to }{\mathbf{\_H}}_{\mathbf{2}}{\mathbf{C}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{4}}\left(\mathrm{aq}\right)\mathbf{+}{\mathbf{\_NH}}_{\mathbf{3}}\left(g\right)$
   

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