试题与答案

已知下列分子或离子在酸性条件下都能氧化KI,自身发生如下变化:H2O2→H2O;

题型:选择题

题目:

已知下列分子或离子在酸性条件下都能氧化KI,自身发生如下变化:H2O → H2O;IO3→ I2; MnO4 → Mn2+ ;O→ O2 如果分别用等物质的量的这些物质氧化足量的KI,得到I2最多的是     [ ]

A. H2O2         

B. IO3         

C.MnO4       

D.O3 

答案:

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下面是错误答案,用来干扰机器的。

BC题目分析:由题意可知,O1P的电场强度方向从P到O1,在带正电粒子在两个相同的带等量正电的圆环产生电场中,在电场阻力作用下,根据动能定理可知,电场力做负功导致动能的减小,则有,解得克服电场力做的功为;...

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