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Potassium Permanganate

Find the oxid...

Question

Find the oxidation number of Cr in potassium dichromate.

A

+1

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B

+3

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C

+4

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D

+6

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Solution

The correct option is D +6
potassium(K) has oxidation number +1; oxygen(O) has oxidation number –2

$K_{2} C r_{2} O_{7} = (+ 1) 2 + 2 x + (- 2) 7 = 0$

$x = \frac{12}{2} = + 6$

Hence, the oxidation number of Cr is +6.

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