A) + 3
B) + 6
C) + 5
D) + 2
Correct Answer: A
$ [Co,{{(NH_3)}_6}],Cl_3\to {{[Co{{(NH_3)}_6}]}^{3+}}+3C{l^{-}} $
$ x+6,(0)=+,3\Rightarrow x=+3 $ .
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