Rules for assigning oxidation numbers

1. Which of the following is a False statement?

The oxidation number of chlorine atoms in Cl2 is zero.

Oxidation results in an increase in oxidation number.

The oxidizing agent in a redox reaction is reduced.

Electrons are being transferred in a redox reaction.

Reduction is loss of electrons.

2. Which substance is being oxidized in the following reaction?
2 HCl_(aq) + Zn_(s) → ZnCl_2(aq)+ H_2(g)

Cl^–_(aq) ions

Zn_(s)

Zn²⁺(aq) ions

H₂(g)

3. What is the oxidation number of Cr in K₂Cr₂O₇?

4. What is the oxidation number of Cl in HClO2?

-1

5. What is the oxidation number of Mn in MnO₄^–

6. What is the oxidation number of O in O₂F₂

-1

-2

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