题目在我国古代典籍中有着"银针验毒"的记载,"银针验毒"的反应原理之一是4Ag+2H2S+O2=2Ag2S+2X4Ag+2H_{2}S+O_{2}=2Ag_{2}S+2X4Ag+2H2S+O2=2Ag2S+2X,则XXX的化学式是（ ）A.H2O2H_{2}O_{2}H2O2B.H2H_{2}H2C.H2OH_{2}OH2OD.SO2SO_{2}SO2知识点：质量守恒定律的实验探究章节：科学探究 / 科学探究能力
