Which of the following is incorrect in a galvanic cell?

$A$ saturated solution of $KNO_3$ is used to make a salt bridge because...

$A$ concentrated solution of $KNO_3$ is used in the preparation of a salt bridge because:

What is the correct cell representation for the reaction $2Br^{-}_{(aq)} + Cl_{2(g)} \rightarrow Br_{2(l)} + 2Cl^{-}_{(aq)}$?

In a $Cu-Zn$ electrochemical cell:

Depict the galvanic cell in which the reaction $Zn_{(s)} + 2Ag^{+}_{(aq)} \rightarrow Zn^{2+}_{(aq)} + 2Ag_{(s)}$ takes place. Further show:
$(i)$ Which of the electrode is negatively charged?
$(ii)$ The carriers of the current in the cell.
$(iii)$ Individual reaction at each electrode.