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Find the oxidation number of Cr in Cr2O7^2-

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+2 votes
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asked Aug 18, 2016 in Chemistry by Rahul Roy (7,895 points) ● 33 ● 108 ● 288

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+3 votes
answered Aug 18, 2016 by vikash (21,277 points) ● 4 ● 19 ● 70
selected Aug 18, 2016 by Rahul Roy
 
Best answer

The oxidation number of chromium in Cr2O72- is +6

The sum of the oxidation numbers in Cr2O72-, a polyatomic ion, is -2

O = -2 
Cr = +6 

i.e  2(+6)  + 7 (-2) = -2

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