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Questão

Considere as seguintes reações espontâneas:

H g subscript 2 to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript space plus space S n to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript space rightwards arrow space 2 space H g subscript left parenthesis l right parenthesis end subscript space plus space S n to the power of 4 plus end exponent subscript left parenthesis a q right parenthesis end subscript 2 space V to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript space plus space S n to the power of 4 plus end exponent subscript left parenthesis a q right parenthesis end subscript space rightwards arrow space 2 space V to the power of 3 plus end exponent subscript left parenthesis a q right parenthesis end subscript space plus space S n to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript C u to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript space plus space 2 space V to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript space rightwards arrow space C u subscript left parenthesis s right parenthesis end subscript space plus space 2 space V to the power of 3 plus end exponent subscript left parenthesis a q right parenthesis end subscript C u to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript space plus space S n to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript space rightwards arrow space C u subscript left parenthesis s right parenthesis end subscript space plus space S n to the power of 4 plus end exponent subscript left parenthesis a q right parenthesis end subscript

A ordem crescente de potenciais de redução é:

V - Cu - Sn - Hg
V - Sn - Cu - Hg
Cu - Sn - V - Hg
Sn - Hg - V - Cu
Hg - Cu - Sn - V
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