第8题:[单选题]( )在Sn2+、Fe2+的混合溶液中,欲使Sn2+氧化为Sn4+而Fe2+不被氧化,应选择的氧化剂是( ) 。(EΘSn4+∕Sn2+=0.15V, EΘ Fe3+∕Fe2+=0.77V) A. KlO3(EΘ 2IO-3∕I2=1.20V) B. H2O2(EΘH2O2∕2OH-=0.88V) C. HgCl2 (EΘHgCl2∕Hg2Cl2=0.63V) D. SO2-3 (EΘSO32-∕S=-0.66V) 参考答案:C
第35题: [单项选择]Where is George now A. Here. B. In Europe. C. In Canada. D. In California. 参考答案:C 答案解析:[听力原文]
M: Why are you in a hurry
W: We’re preparing to go for a picnic tomorrow. I want to buy so