CuS + 2AgNO3 → Cu(NO3)2(aq)+Ag2S(s)
In the reaction, oxidation number of Cu is +2, oxidation number of S is -2, oxidation
number of Ag is +1 and the oxidation number of NO3- radical is -1 (oxidation number of N
is +5 and oxidation number of O is -2).
There is no increase or decrease in oxidation number in the reaction. Therefore it is not a
redox reaction (absence of oxidation and reduction ) and it is a non-redox reaction. The
reaction is double displacement reaction.