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Determine which of the following pairs of reactants will result in a spontaneous reaction at 25 degrees C.
a. Sn^4+(aq) + Mg(s)
b. Cr^3+(aq) + Ni(s)
c. Zn(s) + Na+(aq)
d. Fe(s) + Ba^2+(aq)
e. none of the above pairs will react
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