The reaction Fe→Fe2++2e−(+0.44 volt) would occur spontaneously with which of the following? I. Pb→Pb2++2e−(+0.13 volt) II. Cu→Cu2++2e−(−0.34 volt) III. 2Ag++2e−→2Ag0(+0.80 volt) Select the correct option among the following :
A
I only
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B
III only
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C
I and III only
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D
II and III only
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E
I, II and III
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Solution
The correct option is E I, II and III Oxidation potential order :
Fe>Pb>Cu>Ag
As the oxidation potential of Fe is more than Pb,Cu,Ag, it can react spontaneously with all three of the substances.