oxidation state of Co In [( Co(NH3)5 Cl]cl2
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OS= +3
ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘꜱ ʏᴏᴜ
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+3
Chlorine atoms almost always -1, therefore the counter ions (Cl2) give a net charge of -2. All five NH3 ligands are neutral and the remaining Cl is -1, so Co must have an oxidation number of +3.
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