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Question

For the reaction:
Fe2+(aq)+Ag+(aq)Ag(s)+Fe+3(aq)


Predict which change will decrease the cell voltage?

A
Increase the amount of Ag
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B
Decrease the concentration of Ag+
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C
Increase the concentration of Fe+3
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D
Both B and C
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Solution

The correct option is B Increase the concentration of Fe+3
Ecell=Eocell2.303RTnFlog[Ag][Fe+3][Fe2+][Ag+]

Increasing the concentration of Fe+3 will decrease cell voltage (Ecell) .

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