Answer
a) $NH^+_4$
b) $Sn^{2+}$
c) $CrO^{2-}_4$
d) $NO^-_3$
Work Step by Step
a) $NH^+_4$
b) $Sn^{2+}$
c) $CrO^{2-}_4$
d) $NO^-_3$
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