Question $9($Mandatory$)(1$ point$)$

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From the standard reduction potentials given below, which of the following pairs of substances will react spontaneously?

$S{n}^{2+}(aq)+2e^{-}Sn(s),E^0=-0\mathrm{.}14V$

$2H^{+}(aq)+2e^{-}{H}_2(g),E^0=0\mathrm{.}00V$

$C{d}^{2+}(aq)+2e^{-}Cd(s),E^0=-0\mathrm{.}40V$

a$)C{d}^{2+}(aq)$ with $H^{+}(g)$

b$)C{d}^{2+}(aq)$ with $H_2(g)$

c$)Sn(s)$ with $C{d}^{2+}(aq)$

d$)Cd(s)$ with $S{n}^{2+}(aq)$

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