题干

24 mL 0.05 mol/L的Na2SO3溶液,恰好与20mL 0.02 mol/L的K2Cr2O7溶液完全反应,则Cr在还原产物中的化合价是

A:+6

B:+3

C:+2

D:0

上一题 下一题 0.0难度 选择题 更新时间:2015-09-22 06:12:57

答案(点此获取答案解析)

B

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