问题
选择题
以下说法正确的是( )
A.Cl2氧化性比S单质氧化性弱
B.N2既有氧化性又有还原性
C.HCl的还原性强于HBr
D.H+的氧化性小于Mg2+
答案
答案:B
由同主族同周期元素性质递变规律可知,氧化性:Cl2>S,H+>Mg2+,还原性:HBr>HCl,N2中氮处于中间价态,既有氧化性,又有还原性。故应选B。
以下说法正确的是( )
A.Cl2氧化性比S单质氧化性弱
B.N2既有氧化性又有还原性
C.HCl的还原性强于HBr
D.H+的氧化性小于Mg2+
答案:B
由同主族同周期元素性质递变规律可知,氧化性:Cl2>S,H+>Mg2+,还原性:HBr>HCl,N2中氮处于中间价态,既有氧化性,又有还原性。故应选B。
从方框中选词,并用其适当的形式填空,完成 Bill 写给 Jenny 的email。 | |
Thank you for your last email. How is everything in China? How many students __1__ in your class? Have you got __2__ new friends? I __3__ a new teacher- Mr Green. His daughter and son are my good __4__. Do you like China? Do you like your school? Please send (发送) an email to me and send me some __5__ of your school. Thanks. Yours, Bill |