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Four metals Pb, x, y and z, were connected in pairs and the voltage was recorded - HSC - SSCE Chemistry - Question 14 - 2004 - Paper 1
Question 14
Four metals Pb, x, y and z, were connected in pairs and the voltage was recorded. The results obtained are set out in the table below, | Negative terminal | Positi... show full transcript
Worked Solution & Example Answer:Four metals Pb, x, y and z, were connected in pairs and the voltage was recorded - HSC - SSCE Chemistry - Question 14 - 2004 - Paper 1
Step 1
Identify the relationships from the table
Answer
From the results:
- Pair (Pb, x) has a voltage of 0.35 V, indicating that Pb is oxidized and x is reduced.
- Pair (y, Pb) has a voltage of 1.10 V, showing that y is oxidized and Pb is reduced.
- Pair (z, Pb) has a voltage of 2.60 V, revealing that z is oxidized and Pb is reduced.
Step 2
Rank the metals based on ease of oxidation
Answer
Based on the voltage, we can see that:
- Pb is a better oxidizing agent than x and y since it gets reduced in both pairs involving it.
- z has the highest voltage with Pb, signifying that it is the easiest to oxidize.
- Therefore, the order from least oxidizing to most oxidizing is z > y > Pb > x.
Step 3