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Chemical formula of hydrogen peroxide is ...

CO₂
H₂O₂
CH₄
H₂O₄
Hydrogen peroxide is the simplest peroxide. In its pure form, it is a colourless liquid, slightly more viscous than water. It was first obtained by Louis Thénard in 1818 in the reaction of barium peroxide with nitric acid.
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CO₂
H₂O₂
CH₄
H₂O₄
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