what type of reaction is the oxidation of sterling silver?

is sterling silver oxidizing an example of combination, decomposition, single-replacement, double-replacement or combustion?

and if anyone knows the chemical equation that would help me out too.

thanks!!!!

It is a combination reaction.

eg. when silver is heated at a very high temp in presence of oxygen or air silver monoxide will be produced. this is a combination reaction.

4Ag + O2 => 2Ag2O

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