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Standard electrode potentials are: Fe²⁺/Fe [E° = −0.44]; Fe³⁺/Fe²⁺ [E° = +0.77]; If Fe²⁺, Fe³⁺ and Fe blocks are kept together, then

1. Fe²⁺ increases
2. Fe³⁺ decreases
3. Fe²⁺ remains unchanged
4. Fe²⁺ decreases

Correct answer: Fe²⁺ decreases

Solution

The Fe³⁺/Fe²⁺ couple has a higher reduction potential (+0.77 V) than the Fe²⁺/Fe couple (−0.44 V). This means Fe²⁺ will oxidize to Fe³⁺, leading to a decrease in Fe²⁺ concentration.

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