Question

Determine the oxidation state of Cl in CIO3. A +3 B +7 C 0 D +1 E +5

Answer 1

Answer:

E.) +5

Explanation:

Oxygen always has -2 oxidation number.

Because there are 3 oxygen atoms present, this means oxygen is contributing a -6 charge (-2 x 3 = -6).

Therefore, since the overall molecule is -1, chlorine must have an oxidation number of +5 to cancel all of the negative charges but 1.

You can also think of the problem like an equation. In this equation, "x" is the oxidation number of chlorine, (-2) is the oxidation number of oxygen, (3) is the number of oxygen atoms present, and the equation is set equal to (-1) because that is the overall charge of the molecule.

x - 2(3) = -1

x - 6 = -1

x = 5