Which is evidence that the single replacement reaction shown below is also a redox reaction?
Cu + 2AgNO3 ¡æ Cu(NO3)2 + 2Ag

The reaction involves the element oxygen.

There are four different elements in the reaction.

Silver is in a compound as a reactant, but is a pure element as a product.

The nitrate ion, NO3−, does not split apart during the reaction.

Question

Which is evidence that the single replacement reaction shown below is also a redox reaction?
Cu + 2AgNO3 ¡æ Cu(NO3)2 + 2Ag

 The reaction involves the element oxygen.

 There are four different elements in the reaction.

 Silver is in a compound as a reactant, but is a pure element as a product.

 The nitrate ion, NO3−, does not split apart during the reaction.

aaronq · Answer

I guess the asnwer is "Silver is in a compound as a reactant, but is a pure element as a product." though it dont think its clear enough. 

In general, redox reactions involve simultaneous oxidation/reduction of at least 2 different substances. i.e. there is an exchange of electrons between them.