3. What is the oxidation number of any element in the free or uncombined state? a. 0 C. -1 b. +1 d. +2 4. What is the sum of the oxidation number of NO2? a. 0 C. -1 b. +1 d. +2 5. What is the oxidation number of Zinc in ZnH₂? a. 0 C. -1 b. +1 d. +2

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Redox Reactions

Redox reactions are considered to be the chemical reactions involving both oxidation and reduction processes. They are actually oxidation-reduction reactions. The term redox is made from two words where “red” comes from reduction and “ox” comes from oxidation. During a redox reaction electron transfer takes place in such a way that one chemical compound gets reduced and the other one gets oxidized.