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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_______.

Numerical Value Type

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x = + 6
y = + 7
z = +6 (exceptional compound showing the highest oxidation state for iron which is generally +2 or +3)
ans: 19
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