Devise cells in which the following are the electrochemical cell reactions. In each

electrochemical cell reaction, write the half reaction and calculate the standard cell

potential, $E^{}.$

Note: Please refer to Standard Reduction Potentials Appendix to get your answer.

$($a$)2Na(s)+2H_{2}O(l)2$NaOH$(aq)+H_2(g)$

$($b$)H_2(g)+I_2($s$)2HI(aq)$

$($c$)H_3{O}^{+}($aq$)+O{H}^{-}($aq$)2H_{2}O($l$)$

$($d$)$ aq