题目

下列氧化还原反应中，氧化剂和还原剂的物质的量之比不是1∶2的是A.3NO2+H2O==2HNO3+NO                       B.4NH3+5O2==4NO+6H2OC.2H2S+O2==2S+2H2O                             D.MnO2+4HCl==Cl2↑+MnCl2+2H2O 答案：解析：反应B中，氧化剂和还原剂的物质的量之比是5∶4。答案：B–Excuse me, would you please speak a little more ______?–Sorry, I thought you could follow me.A. sadly B. quickly C. politely D. slowly