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The oxidation number of Cr in K2Cr2O7 is

Correct Answer: +6

Explanation:

We will rewrite the formula as an equation.


2K + 2Cr + 7O = 0


The zero comes from there being no overall charge on the compound.


Each oxidation number is represented by the element's symbol.


Since this compound is not a peroxide or superoxide, the oxidation value for O is -2


K being in group 1 has a +1 charge and therefore has an oxidation number of K is +1


Now, by putting known values in we have:


2(+1) + 2(Cr) + 7(-2) = 0


2 + 2Cr -14 = 0


2Cr = +12


Cr = +6.


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