$\begin{array}{1 1} (a)\;(i) E^{\circ} = -ve (ii) K = 1 \\ (b)\;(i) E^{\circ} = +ve (ii) K = 1 \\ (c)\;(i) E^{\circ} = -ve (ii) K = 0 \\(d)\;(i) E^{\circ} = +ve (ii) K = 2 \end{array} $