To determine which reaction is most likely to take place based on the activity series, we need to consider the reactivity of the metals involved. The activity series ranks metals from most reactive to least reactive. A metal higher in the activity series can displace a metal lower in the activity series from a compound.
Here's the given activity series from most reactive to least reactive:
- Li (Lithium)
- Mn (Manganese)
- Zn (Zinc)
- Fe (Iron)
- Pt (Platinum)
- Cu (Copper)
Now, let's analyze each reaction:
1. [tex]\( \text{Pt} + \text{FeCl}_3 \rightarrow \)[/tex]
- Platinum (Pt) is reacting with Iron (III) Chloride (FeCl₃).
- In the activity series, Iron (Fe) is higher than Platinum (Pt).
- Therefore, Platinum cannot displace Iron from FeCl₃.
2. [tex]\( \text{Mn} + \text{CaO} \rightarrow \)[/tex]
- Manganese (Mn) is reacting with Calcium Oxide (CaO).
- In the activity series, Calcium (Ca) is not listed, but it is known to be more reactive than Manganese (Mn).
- Therefore, Manganese cannot react with Calcium Oxide.
3. [tex]\( \text{Li} + \text{ZnCO}_3 \rightarrow \)[/tex]
- Lithium (Li) is reacting with Zinc Carbonate (ZnCO₃).
- In the activity series, Lithium (Li) is higher than Zinc (Zn).
- Therefore, Lithium can displace Zinc from ZnCO₃.
4. [tex]\( \text{Cu} + 2 \text{KNO}_3 \rightarrow \)[/tex]
- Copper (Cu) is reacting with Potassium Nitrate (KNO₃).
- In the activity series, Potassium (K) is much higher than Copper (Cu).
- Therefore, Copper cannot displace Potassium from KNO₃.
Based on this analysis, the most likely reaction to take place is:
[tex]\[ \text{Li} + \text{ZnCO}_3 \rightarrow \][/tex]
This means that Lithium (Li), being the highest in the given activity series, can displace Zinc (Zn) from Zinc Carbonate (ZnCO₃).
Therefore, the reaction most likely to take place is:
[tex]\[ \text{Li} + \text{ZnCO}_3 \rightarrow \][/tex]
Hence, the answer is:
Reaction 3: [tex]\( \text{Li} + \text{ZnCO}_3 \rightarrow \)[/tex]
The corresponding index for this reaction is [tex]\( 2 \)[/tex] as lists are generally zero-based indexed.
