Which pair of ions will be most likely to react at standard state conditions?

a) MnO4- and Sn2+
b) Zn2+ and Cl-
c) I- and Cu
d) Fe3+ and Cu2+

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To determine which pair of ions is most likely to react at standard state conditions, we need to consider their positions in the electrochemical series or activity series. The electrochemical series ranks elements and ions in order of their tendency to undergo chemical reactions.

Here's how you can determine the answer:

1. Start by looking at each pair of ions separately.

a) MnO4- and Sn2+
b) Zn2+ and Cl-
c) I- and Cu
d) Fe3+ and Cu2+

2. Compare the positions of the ions in the electrochemical series. The higher an ion is in the series, the more likely it is to be reduced (gain electrons) and undergo a reaction.

3. The reaction is more likely to occur if one of the ions is higher in the series (more likely to be reduced) and the other ion is lower in the series (more likely to be oxidized).

4. In this case, we can refer to the standard electrochemical series to determine the relative positions of the ions.

Here's the order of reactivity of the given ions based on their positions in the electrochemical series:

MnO4- > Fe3+ > Cu2+ > Zn2+ > I- > Sn2+ > Cl-

5. Looking at the pairs of ions:

a) MnO4- and Sn2+: MnO4- is higher in the series than Sn2+. This indicates that MnO4- is more likely to be reduced, and Sn2+ is more likely to be oxidized. So, they are likely to react.

b) Zn2+ and Cl-: Zn2+ is higher in the series than Cl-. This indicates that Zn2+ is more likely to be reduced, and Cl- is more likely to be oxidized. So, they are likely to react.

c) I- and Cu: Cu is higher in the series than I-. This indicates that Cu is more likely to be reduced, and I- is more likely to be oxidized. So, they are likely to react.

d) Fe3+ and Cu2+: Fe3+ is higher in the series than Cu2+. This indicates that Fe3+ is more likely to be reduced, and Cu2+ is more likely to be oxidized. So, they are likely to react.

Based on the positions of the ions in the electrochemical series, all of the pairs of ions, a) MnO4- and Sn2+, b) Zn2+ and Cl-, c) I- and Cu, and d) Fe3+ and Cu2+, are likely to react at standard state conditions. However, it's important to note that the extent and rate of the reaction can still vary depending on other factors such as concentration, temperature, and presence of a catalyst.