<prompt> H2S inhibits which complex of ETC -IIIIIIIV  <response>: Ans. is d i.e., IV Inhibitors of Electron transport chain Respiratory chaino Complex I :- Barbiturates amobarbital, piercidin A, rotenone, chlorpromazine, guanithidine.o Complex II:- Carboxin, TTFA, malonate.o Complex III :- Dimercaproi. BAL, actinomycin A, Naphthyloquinone.o Complex IV :- cytochrome c oxidase Carbon monoxide CO, cyanide CN-. HJS, azide N3- 