An aqueous solution of metal nitrate P reacts with sodium bromide solution to form yellow precipitate of compound Q which is used in photography.Q on exposure to sunlight undergoes decomposition reaction to form metal present in P along with reddish brown gas.Identify P and Q.Write the chemical reaction and type of chemical reaction.

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Solution

An aqueous solution of metal nitrate P is silver nitrate. When silver nitrate is added to sodium bromide , it will form yellow precipitate of silver bromide , which is Q. Silver bromide is used in photography. The reaction will be :
${AgNO}_{3} + NaBr \to AgBr + {NaNO}_{3}$

Silver bromide on exposure to sunlight will form silver metal and brown coloured bromine gas will be produced. The reaction will be :
$2 AgBr \overset{Sunlight}{\to} 2 {Ag + Br}_{2}$

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