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Decomposition Reaction

A reddish bro...

Question

A reddish brown metal X is added to solution of metal nitrate Y. the metal present in Y is usedfor making jewellery and turns black in air. very thin foils of metal are used to decorate sweets. The compound Z formed on chemical reaction is blue in colour and metal present in Y is formed. Identify the X ,Y and Z and write chemical reaction involved.

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Solution

A reddish brown metal is copper. Metal nitrate solution is silver nitrate.
X = Copper metal
Y = Silver nitrate (AgNO₃)
Silver is used for making jewellery and also used to decorate sweets.
Z is copper nitrate
$A g N O_{3} + C u \to C u C O_{3} + A g$

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