Which of the foll A. CrO-2 , CIO-3 , CrO2-4 , MnO-4
B. CIO-3 , CrO2-4 , MnO-4 , CrO-2
C. CrO2+4 , MnO-4 , CrO-2 , CIO-3
D. CrO2-4, MnO-4 , CrO-2 , CIO-3
The oxidation numbers for all above ionic molecules can be calculated using assigning variable for unknown oxidation state and following the rule that algebraic sum of all oxidation states of a compound is equal to the charge on the compound.
CrO-2 → → x= +3
ClO-3→ → x= +5
CrO2-4→ → x= +6
MnO-4→ → x= +7
The ascending order of increasing oxidation state of the given molecules is: CrO-2 <ClO-3<CrO2-4<MnO-4
The correct option suggesting that is option (i).
*Caution must be taken in noticing the charge on the molecule and not taking it as zero, along with that the rules of finding oxidation number should not be violated.
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