Answer
Please see the work below.
Work Step by Step
We know that
a. No new product is formed
b. $H^++OH^-\rightarrow H_2O$
c. $Pb^{+2}+2Br^-\rightarrow PbBr_2$
d. $2H+CO_3^{-2}+CO_3^{-2}\rightarrow H_2O+CO_2$
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