JEE Main 20202 Sep, Evening shiftChemistryMediumRedox Reactions and Electrochemistry138× since 2002
The oxidation states of transition metal atoms
in K₂Cr₂O₇, KMnO₄ and K₂FeO₄, respectively,
are x, y and z. The sum of x, y and z is _______.
JEE Main 2020 · 2 Sep, Evening shift · Q9