Which cell reaction is spontaneous or non-spontaneous from given standard reduction potentials

1. A.
   ${Zn}_{(s)} + {Mg}_{(aq)}^{+ 2} \longrightarrow {Zn}_{(aq)}^{+ 2} + {Mg}_{(s)}$
2. B.
   $\ 2{Ag}_{(s)} + {Zn}_{(aq)}^{+ 2} \longrightarrow 2{Ag}^{+}\ _{(aq)} + {Zn}_{(s)}$
3. C.
   ${Zn}_{(s)} + {Cu}_{(eq)}^{+ 2} \longrightarrow {Zn}_{(eq)}^{+ 2} + {Cu}_{(s)}$
4. D.
   $\ {Cu}_{(s)} + {Mg}_{(aq)}^{+ 2} \longrightarrow {Cu}_{(aq)}^{+ 2} + {Mg}_{(s)}$

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1. A.
   $\mathrm{Ca(s) + Cd^{2+}(aq) \rightarrow Ca^{2+}(aq) + Cd(s)}$, $[E^0_{\mathrm{Ca}} = -2.866$ V & $E^0_{\mathrm{Cd}} = -0.403$ V$]$
2. B.
   $\mathrm{2Br^-(s) + Sn^{2+}(aq) \rightarrow Br_2(l) + Sn(s)}$, $[E^0_{\mathrm{Br}} = 1.08$ V & $E^0_{\mathrm{Sn}} = -0.136$ V$]$
3. C.
   $\mathrm{2Ag(s) + Ni^{2+}(aq) \rightarrow 2Ag^+(aq) + Ni(s)}$, $[E^0_{\mathrm{Ag}} = 0.799$ V & $E^0_{\mathrm{Ni}} = -0.257$ V$]$
4. D.
   $\mathrm{2Au(s) + Zn^{2+}(aq) \rightarrow 2Au^+(aq) + Zn(s)}$, $[E^0_{\mathrm{Au}} = 1.68$ V & $E^0_{\mathrm{Zn}} = -0.763$ V$]$

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1. A.
   $\mathrm{2Ag_{(s)} + Fe^{+2}_{(aq)} \rightarrow 2Ag^{+1}_{(aq)} + Fe_{(s)}}$
2. B.
   $\mathrm{2Al_{(s)} + 3Cu^{+2}_{(aq)} \rightarrow 2Al^{+3}_{(aq)} + 3Cu_{(s)}}$
3. C.
   $\mathrm{Fe_{(s)} + Cu^{+2}_{(aq)} \rightarrow Fe^{+2}_{(aq)} + Cu_{(s)}}$
4. D.
   $\mathrm{2Al_{(s)} + 3Fe^{+2}_{(aq)} \rightarrow 2Al^{+3}_{(aq)} + 3Fe_{(s)}}$

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