Page 327 - Teacher Preview Copy

.
Topic 11: Redox and electrochemistry

2. Oxidation Number: Recalling rules of assigning oxidation numbers

1. The sum of all oxidation numbers of atoms in a chemical formula must equal
1) -1 2) 0 3) 1 4) 2

2. The oxidation number of elements in their free state must be always be a 4) 3

1) 0

3) 2
2) 1

3. What oxidation number do elements in Group 1 tend to form when they bond with other elements
in compounds?

1) 0 2) +2 3) -1 4)+1

4. The alkaline earth metals in compounds tend to form oxidation number of a

1) -2 2) +2 3) +1 4) 0
Teacher Preview Copy
Teacher Preview Copy

5. The most common oxidation number of halogen in a binary compound is
1) 0 2) -1 3)+1 4) -2

3. Oxidation Numbers: Determining oxidation number of an element in a formula

1. The oxidation number of nitrogen in N2 is

1) +1 2) 0 3) +3 4) -3

2. What is the oxidation number of oxygen in OF2?
1) +1 2) +2 3) -1 4) -2

3. What is the oxidation number of calcium in CaH2?

1) 0 2) +1 3) +2 4) -2

4. The oxidation number of fluorine in MgF2 is

1) -1 2) 0 3) +1 4) 1-

5. The oxidation number of H in H2O is

1) +2 2) +1 3) 0 4) -1

6. What is the oxidation number of oxygen in hydrogen peroxide, H2O2 ?

1) -1 2) +1 3) -2 4) +2

7. What is the oxidation number of oxygen in ozone, O3,

1) +1 2) 0 3) -2 4) -6

8. The oxidation number of hydrogen in BeH2 is
1) +1 2) -1 3) 0 4) +2

9. What is the oxidation of hydrogen in LiH?

1) 0 2) +1 3) +2 4) -1

10. The oxidation number of nitrogen in Al3N2 is

1) +3 2) +2 3) -3 4) -6

Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 317