Answer
Please see the work below.
Work Step by Step
We know that
a. $H^{+}+OH^-\rightarrow H_2O$
b. $Ag^++Br^\rightarrow AgBr$
c. $2H^++S^{-2}+H_2S$
d. $NH_4^{+}+OH^-\rightarrow NH_3+H_2O$
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