What is the density of a solution of sulphuric acid used as an electrolyte in lead accumulators (in $g \ mL^{-1}$)?

Depict the galvanic cell in which the cell reaction is: $Cu + 2Ag^{+} \to 2Ag + Cu^{2+}$

Which of the following statements is correct?

The reaction $\frac{1}{2} H_{2(g)} + AgCl_{(s)} \rightleftharpoons H^{+}_{(aq)} + Cl^{-}_{(aq)} + Ag_{(s)}$ occurs in which of the given galvanic cell?

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

The acid used in lead storage battery is