Complete and balance each of the following half-reactions (steps 2-5 in half reaction method):
(a) sn4+ --> sn2+
(b) [ag(nh3)2]+ --> ag + nh3
(c) hg2cl2 --> hg + cl-
(d) h2o --> o2 (in acidic solution)
(e) io3- --> i2
(f) so32- --> so42- (in acidic solution)
(g) mno4- --> mn2+ (in acidic solution)
(h) cl- --> clo3- (in basic solution)