Qualitative Analysis
Quick practice
Question 1 of 5
The pair of compounds with metals in highest oxidation state is:
A
B
C
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, ![[Co(CN)_3(H_2O)_3]](data:image/png;base64,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){kind=small}
D
![\left[\mathrm{NiCl}_{4}\right]^{2-},\left[\mathrm{CoCl}_{4}\right]^{-}](data:image/png;base64,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){kind=small}
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