Write the essential condition for the following reaction to take place: $2 AgCl \rightarrow 2 Ag + Cl_{2}$ and write one use of this reaction.
(N/A) $(i)$ The essential condition for the reaction $2 AgCl \rightarrow 2 Ag + Cl_{2}$ to occur is the presence of sunlight (photolytic decomposition).
$(ii)$ This reaction is used in black and white photography.
$(ii)$ This reaction is used in black and white photography.
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