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Which one of the following reactions is spontaneous (in the direction given) under standard elecrochemical conditions?...

Which one of the following reactions is spontaneous (in the direction given) under standard elecrochemical conditions?

A. Pb2+ + 2I- --> Pb + I2

B. Cu2+ + Fe ---> Cu + Fe2+

C. 2Au + Pt2+ --> 2Au+ + Pt

D. Mg2+ + 2Br- --> Mg + Br2

E. 2Hg + 2Cl- +2H+ --> Hg2Cl2 + H2

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Answer #1

B. Cu2+ + Fe ---> Cu + Fe2+

Because Fe is more reducing agent than Copper.

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