91Ó°ÊÓ

We have to write the formula for the polyatomic ion and name of ${\mathrm{MgCO}}_3$compound.

We know that ${\mathrm{MnCO}}_3$can be written as ${\mathrm{Mn}}^{2+}$and ${\mathrm{CO}}_3^{2-}$in ionic form,

So, its polyatomic ion is ${\mathrm{CO}}_3^{2-}$ and its name is manganese carbonate.

We have to write the formula for the polyatomic ion and name of ${\mathrm{Au}}_2{\mathrm{SO}}_4$compound.

We know that ${\mathrm{Au}}_2{\mathrm{SO}}_4$can be written as ${\mathrm{Au}}^{+}$and ${\mathrm{SO}}_4^{2-}$in ionic form,

So, its polyatomic ion is ${\mathrm{SO}}_4^{2-}$ and its name is gold sulphate.

We have to write the formula for the polyatomic ion and name of ${\mathrm{Mg}}_3{\left({\mathrm{PO}}_4\right)}_2$compound.

We know that ${\mathrm{Mg}}_3{\left({\mathrm{PO}}_4\right)}_2$can be written as ${\mathrm{Mg}}^{2+}$and ${\mathrm{PO}}_4^{3-}$in ionic form,

So, its polyatomic ion is ${\mathrm{PO}}_4^{3-}$ and its name is magnesium phosphate.

We have to write the formula for the polyatomic ion and name of $\mathrm{Fe}{\left({\mathrm{HCO}}_3\right)}_3$compound.

We know that $\mathrm{Fe}{\left({\mathrm{HCO}}_3\right)}_2$can be written as ${\mathrm{Fe}}^{2+}$and ${\mathrm{HCO}}_3^{-}$in ionic form,

So, its polyatomic ion is ${\mathrm{HCO}}_3^{-}$ and its name is iron hydrogen carbonate.