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The life span of a Daniel cell may increased by:

1. large Cu electrode
2. lowering of CuSO \( _{4} \) concentration
3. lowering of ZnSO \( _{4} \) concentration
4. large zinc electrode

Correct answer: large Cu electrode

Solution

In a Daniell cell, the copper electrode is the cathode where Cu²⁺ is reduced and deposited. A larger copper electrode provides more surface area and capacity for this process, helping the cell operate for a longer time.

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