Predict whether the following metals will react with the acid indicated. Provide proof of your answer.

If a reaction does occur, write the balanced redox reaction.

Assume that reactants and products are in their standard states.

a$.$ Ag in HNO$3($aq$)$

b$.$ Zn in HI$($aq$)$

c$.$ Au in HNO$3($aq$),$ for the couple Au$3+/$Au$,$ E$\backslash$deg $=1\mathrm{.}52$ V