(a) 4Fe3+aq+3K4FeCN6→Fe4FeCN63+12K+
(b) 2K2HgI4aq+2NH3g→NH2Hg2I3+4KI+NH4I
(c) P4s+3OH-aq+3H2OI→PH3+3H2PO2
(d) SeO2+H2O→H2SeO3
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