write a short nate on application of decomposition reaction which is used in photography.

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Solution

An aqueous solution reacts with sodium bromide to form yellow precipitate that is used in photography. The precipitate must be silver bromide which decomposes on exposure to sunlight. The orangish gas released must be bromine gas.
Thus the series of reaction can be shown as
AgNO₃ + NaBr â†’ AgBr + NaNO₃
2AgBr â†’ 2Agâ†“ + Br₂

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