JEE Main Chemistry question
How many of the following species have more than one oxidation state (except zero)?
Cu, Zn, Cr, Mn, Cl, O, P, Sn, Al
Answer: 7
Solution
Cu shows ; Cr shows ; Mn shows to ; Cl shows ; O shows (peroxides), (superoxides) and (in ); P shows ; and Sn shows — each of these
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