21. An aqueous solution of metal nitrate 'P' reacts with sodium bromide
solution to form yellow precipitate 'Q' which is used in photography. "Q"
on exposure to sunlight undergoes decomposition to form metal present
along with a reddish brown gas. Identify 'P' and 'Q'. Write the balanced
chemical equation for the reaction of 'P' with sodium bromide solution.
List the categories in which this reaction can be placed.
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Answer:
It could be any metal nitrate but only silver chloride and silver bromide are used for photography. AgNO3 + NaBr ------> AgBr + NaNO3. This is double displacement reaction. The yellow precipitate is AgBr
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