Question

What is a redox reaction?

A. A reaction in which an element in one molecule is traded for an element in another.
B. A reaction in which the number of protons changes between the reactant and product
C. A reaction in which the oxidation state of one element increases and another decreases
D. A reaction in which an element changes phases when going from reactant to product.

Answer 1

A. A reaction in which an element in one molecule is traded for an element in another.

Step-by-step explanation:

a.p.3.x

Answer 2

A reaction in which the oxidation state of one element increases and another decreases

Step-by-step explanation:

Redox reaction means both oxidation and reduction take place in that reaction.

So when an element oxides its oxidation state increases and when an element reduces its oxidation state decrease.