what the oxidation number of cobalt in Co(NH3)4Cl2 ?
A.-2 B.0 C.+2 D.+6
the oxidation number of NH3 is +1, and the oxidation number of Cl is -1,so
x+(+4)+(-2)=0
x= -2
but the answer is C, I can't understand, can anyone explain to me?
(It's from 2006 CE paper2 No.3)
Do you know any website for solve the problems about CE Chem?
about oxidation number
2010-04-12 12:47 am
回答 (2)
2010-04-12 1:02 am
✔ 最佳答案
The answer of the question is C.NH3 is a neutral molecule, which has the same of oxidation number 0.
(The sum of oxidation number of NH4^+ is +1. Nut now, it is NH3, NOT NH4^+.)
Cl^- is an anion, and thus its oxidation number of -1.
Co(NH3)4Cl2 is a neutral compound.
Sum of oxidation numbers = (Oxidation number of Co) + 4(0) + 2(-1) = 0
Hence, oxidation number of Co = +2
(I cannot find any website for HKCEE questions, because HKCEE questions are too simple to many people.)
參考: 胡雪八
2010-04-12 1:49 am
CoCl2 + 4NH3 = > Co(NH3)4Cl2 ????
收錄日期: 2021-04-30 11:42:47
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