Among thw following, the species in which the oxidation number of an element is +6

Question

Among the following, the species in which the oxidation number of an element is +6

Answer 1

Answer: CrO₂Cl₂
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The oxidation number of manganese in MnO₄⁻ is 7.
The oxidation number of chromium in Cr(CN)₆³⁻ is +3.
The oxidation number of nickel in NiF₆²⁻  is +4.
The oxidation number of chromium in CrO₂Cl₂ is +6.
Hence, the species in which an element has oxidation number +6 is CrO₂Cl₂.