Answer
Please see the work below.
Work Step by Step
We know that
a. $CuBr$ as given that $Cu^{+2}$ ion.
b. $Mn_2O_3$ as $Mn^{+2}$ion.
c. $Hg_2I_2$ as $I^{-2}$ions.
d. $Mg(PO_4)_2$ as given that $Mg^{+2}$ ions.
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