#1
[tex]\\ \tt\bull\rightarrowtail Ba^{2+}+NO_2\longrightarrow Ba(NO_2)_2[/tex]
#2
[tex]\\ \tt\bull\rightarrowtail Ba^{2+}+SiO_3^{2-}\longrightarrow BaSiO_3[/tex]
#3
[tex]\\ \tt\bull\rightarrowtail Ba^{2+}+HSO^{4-}\longrightarrow Ba_4HSO_2[/tex]
#4
[tex]\\ \tt\bull\rightarrowtail Ba^{2+}+PO_4^{3-}\longrightarrow Ba_3(PO_4)_2[/tex]
