Find the oxidation state of sodium in Na2O2

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3 Answers

Each oxygen in a peroxide is assigned a formal charge of -1. Since sodium peroxide is neutral overall, each sodium atom is assigned an oxidation number of +1.

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Let x be the oxidation station of sodium in Na2​O2​.

therefore 
Na2= 2x  &  O2= (-1)2
= 2x+(-2)=0
=2x-2=0
x=(-2)/2
x=(-1)

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Let the oxidation state of Na be y.

In case of peroxides, the oxidation state of oxygen is -1.

2(y) + 2(-1) = 0

2y – 2 = 0

2y = 2

Y = +1

Y = +1

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