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This Is a True Story; Can You Explain What Happened Ered E _ { \text {red } } ^ { \circ }

Question 35

Multiple Choice

This is a true story; can you explain what happened? Prior to a really important dinner party, the hostess discovered that her silverware was very tarnished. She needed a quick fix. She remembered reading that the tarnish (Ag2S) would be removed if you immersed the silverware in a hot solution of baking soda (NaHCO3) in a pan lined with aluminum foil. So she did, and so it was, but she noticed a bit of a rotten egg smell (H2S) being produced. Which one of the following statements cannot represent what might have been happening? Metal/Metal ion
Ered E _ { \text {red } } ^ { \circ }
 silver/silver(I)  0.799 aluminum/aluminum(III)  1.677\begin{array} { l r } \text { silver/silver(I) } & 0.799 \\ \text { aluminum/aluminum(III) } & - 1.677 \end{array}


A) Al \rightarrow Al3+ + 3e-
B) Ag+ + e- \rightarrow Ag
C) 2HCO3- +S2- \rightarrow H2S + 2CO32-
D) HCO3- +S2- \rightarrow HS- + CO32-
E) 2HCO3- +Ag2S \rightarrow H2S + 2CO32- + 2Ag

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