Explanation:
It is known that molecular formula of potassium dichromate is [tex]K_{2}Cr_{2}O_{7}[/tex]. As potassium has an oxidation state of +1 and an oxygen atom has an oxidation state of -2.
Let the oxidation state of chromium is x. Therefore, calculate the oxidation state of chromium as follows.
[tex]K_{2}Cr_{2}O_{7}[/tex] = 0 (as the molecule is neutral)
[tex](2 \times 1) + 2x + (-2 \times 7)[/tex] = 0
2 + 2x - 14 = 0
x = +6
Thus, we can conclude that the oxidation state of the chromium in the potassium dichromate molecule is +6.
