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Arrange the following reducing agents in the order of increasing strength under standard state conditions - Chemistry

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Arrange the following reducing agents in the order of increasing strength under standard state conditions. Justify the answer 

Element

Al(s)

Cu(s)

Cl(aq)

Ni(s)

 

Eo

-1.66V

0.34V

1.36V

-0.26V

 

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Solution

Cl < Cu < Ni < Al

Reason: Substances which have lower electrode potential are stronger reducing agents, while those which have high electrode potential are stronger oxidising agents.

Concept: Galvanic Cells - Introduction
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