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An aqueous solution of metal nitrate (P)...

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

Text Solution

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P is `AgNO_3` and Q is AgBr
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