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Reaction with Oxygen

An aqueous ...

Question

An aqueous solution of metal nitrate X react
s with sodium bromide solution to form yellowprecipitate of compound Y which is used in photography. Y on exposure to sunlight, undergoesdecomposition reaction to form metal present in Xalong with orangish brown gas. Identify X andY and write chemical equations for the reactionsinvolved.

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Solution

Compound which is used in photography is AgBr (Y) which is yellow in colour.
So the metal nitrate should be AgNO₃(X) which on reaction with NaBr form AgBr.
AgNO₃ + NaBr $\to$ AgBr + NaNO3
AgBr undergoes decomposition reaction in presence sunlight and form silver metal and bromine gas. Br₂ is orangish-brown gas.
2AgBr $\overset{s u n l i g h t}{\to}$ 2Ag + Br₂

Thus , X = AgNO₃
Y = AgBr
Orangish-brown gas = Br₂

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