Pb(NO_{3})_{2}(aq) + 2NaI(aq) -> PbI_{2}(s) + 2NaNO_{3}(aq) L_{2}N(aq) + SI(aq) -> L_{2}I(s) + SN(aq) Pb_{2}N(aq) + NaI(aq) -> Pb_{2}I(s) NaN(aq) Fe(NO_{3})_{2}(aq) + 2NaI(aq) -> FeI_{2} + 2NaNO_{3}(aq)
I gave my students this multiple choice question: A solution of lead (II) nitrate reacts with a solution of sodium iodide to produce a yellow solid of lead (II) iodide and aqueous sodium nitrate. Which of these illustrates the reaction?

Only one answer is correct among these 4 choices:
- Pb(NO_{3})_{2}(aq) + 2NaI(aq) -> PbI_{2}(s) + 2NaNO_{3}(aq)
- L_{2}N(aq) + SI(aq) -> L_{2}I(s) + SN(aq)
- Pb_{2}N(aq) + NaI(aq) -> Pb_{2}I(s) NaN(aq)
- Fe(NO_{3})_{2}(aq) + 2NaI(aq) -> FeI_{2} + 2NaNO_{3}(aq)

Could you tell me which one is correct?

Pb(NO_{3})_{2}(aq) + 2NaI(aq) -> PbI_{2}(s) + 2NaNO_{3}(aq)