在配平的N2H4+MnO4-+H+→N2+Mn2++H2O的方程式中,H2O分子前面的

在配平的N2H4MnO4H→N2Mn2H2O的方程式中,H2O分子前面的系数为

A  6          B  10          C  12          D  16

答案

B

相关题目

森林着火时,救火员开辟防火隔离带的目的是(     )  
森林着火时,救火员开辟防火隔离带的目的是(     )    A. 隔绝空气                        B. 开辟道路以利于运水灭火    C. 隔离可
已知平面向量,,且,则(  ) A               B   
已知平面向量,,且,则(  ) A               B                 C                D 
下列关于国家的表述,正确的是:(  )   A.国家是随着阶
下列关于国家的表述,正确的是:(  )   A.国家是随着阶级的产生而产生的   B.国家的性质就是国家的阶级本质   C.国家是民主与专政的统一体  
After work, reading a good book and listening to soft music ________ me in a go
After work, reading a good book and listening to soft music ________ me in a good mood. A.have put  B.puts  C.is putting  D.put
2011年9月18日,根据全省的统一部署,我们庆云县的冯老师与
2011年9月18日,根据全省的统一部署,我们庆云县的冯老师与我市选派的其他12名优秀骨干教师赴新疆喀什地区进行为期一年的支教工作。对此,你的感
 –Don’t make any noise in the reading room any more.  –       .  
 –Don’t make any noise in the reading room any more.  –       .       A. Yes, I won’t.     B. No, I don’t.      C. No, I won’t      D. Yes, I do.
There were special activities on May 12        the people who lost thei
There were special activities on May 12        the people who lost their lives in the earthquake and rescue. A.in favour of                    B.in memory of C.in pla
In the traffic accident, his father came close to __________. A. be killed  
In the traffic accident, his father came close to __________. A. be killed       B. being killed C. kill            D. killing

最新题目