Chapter 7 Oxid #s
Honors Chemistry
1. What is the oxidation number of manganese in
?
A) +7
B) +2
C) +3
D) +4
2. What is the oxidation state of nitrogen in the compound
NH 4Br?
A) –1
B) +2
C) –3
D) +4
3. What is the oxidation number of sulfur in
Na2S2O3 ?
A) –1
B) +2
C) +6
D) +4
4. Given the reaction that occurs in an electrochemical cell:
Zn(s) + CuSO4(aq)
ZnSO 4(aq) + Cu(s)
During this reaction, the oxidation number of Zn
changes from
A) 0 to +2
C) +2 to 0
B) 0 to –2
D) –2 to 0
5. In which substance does hydrogen have an oxidation
number of zero?
A) LiH
B) H2O
C) H2S
D) H2
6. Oxygen will have a positive oxidation number when
combined with
A) fluorine
C) bromine
B) chlorine
D) iodine
7. If element X forms the oxides XO and X2O3, the
oxidation numbers of element X are
A) +1 and +2
C) +1 and +3
B) +2 and +3
D) +2 and +4
Answer Key
Ch 7 Oxid #s
1.
A
2.
C
3.
B
4.
A
5.
D
6.
A
7.
B