做实验时不小心粘了一些高锰酸钾,皮肤上的黑斑很久才能消除,如

做实验时不小心粘了一些高锰酸钾,皮肤上的黑斑很久才能消除,如果用草酸的

稀溶液洗涤马上可以复原,其离子方程式为:

++H+CO2+Mn2++□。关于此反应的叙述正确的是(     )

A.该反应的氧化剂是

                      B.该反应右边方框内的产物是OH-

C.该反应电子转移总数是5e-                       D.配平该反应后,H+的系数是16

答案

【解析】  考查氧化还原反应中的基本概念及其配平。很显然,方框内的产物应为H2O,配平后的方程式为++16H+=10CO2+2Mn2++8H2O,此反应的氧化剂是,还原剂是,每有2mol参加反应,转移电子总数为10 mol。

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