a metal nitrate solution 'a' is added to reddish brown metal 'b'. the metal present in 'a' is used for making jewellery and turns black in air, very thin foils of metal are used to decorate sweets. the compound 'c' formed on chemical reaction is blue in colour and metal present in 'a' is formed, identify 'a', 'b' and 'c' and write chemical reactions invovled.
The metal A is silver as silver gets tarnished in air and is used in decoration of sweets.
The metal B is Copper, as copper is the reddish brown metal.
2AgNO3 + Cu →Cu(NO3)2 + 2Ag
Therefore, the compound C is copper nitrate which is blue in colour.