NEW
Font size
S
M
L
XL
Worksheets9.1 Oxidation number
Total questions: 14
Worksheet time: 23mins
Name
Class
Date
1.
Which statement is correct?
a)
Oxidation is loss of elec and a decrease in oxidation state.
b)
Oxidation is gain of elec and an increase in oxidation state
c)
Reduction is loss of elec and increase in oxidation state.
d)
Reduction is gain of elec and a decrease in oxidation state.
2.
What are the oxidation numbers of elements in sulfuric acid, H2SO4?
a)
A
b)
B
c)
C
d)
D
3.
What are the oxidation numbers of elements in phosphoric acid, H3PO4?
a)
A
b)
B
c)
C
d)
D
4.
Which are examples of reduction?
a)
I and II
b)
I and III
c)
II and III
d)
I, II and III
5.
Which change does nitrogen undergo oxidation?
a)
A
b)
B
c)
C
d)
D
6.
Which statement is correct?
a)
H2SO3 is reducing agent because it undergoes reduction.
b)
H2SO3 is reducing agent because it undergoes oxidation.
c)
Sn4+ is oxidizing agent because it undergoes oxidation
d)
Sn4+ is reducing agent because it undergoes oxidation
7.
What happens to vanadium during reaction VO2+ → VO3-
a)
Undergo oxidation and oxidation number changes from +4 to +5
b)
Undergo oxidation and oxidation number changes from +2 to +4
c)
Undergo reduction and oxidation number changes from +2 to -1
d)
Undergo reduction and oxidation number changes from +4 to +2
8.
What is the reducing agent in this reaction?
a)
Cu
b)
NO3-
c)
Cu2+
d)
H+
9.
Oxidation number of chromium is the same in all compounds except
a)
Cr(OH)3
b)
Cr2O3
c)
Cr2(SO4)3
d)
CrO3
10.
What happens to Cr3+ ion when it is converted to CrO42–
a)
Oxidation number decreases and it undergo reduction
b)
Oxidation number decreases and it undergo oxidation
c)
Oxidation number increases and it undergo reduction
d)
Oxidation number increases and it undergo oxidation
11.
What is the oxidation number of Fe in the two complex ions?
a)
A
b)
B
c)
C
d)
D
12.
What is the oxidation state of cobalt in these compounds?
a)
A
b)
B
c)
C
d)
D
13.
Which compound contains nitrogen with an oxidation number of +3?
a)
NH4Cl
b)
HNO3
c)
N2O4
d)
KNO2
14.
What happens to iodine when iodate, IO3–, converted to iodine, I2?
a)
Undergo reduction and oxidation number changes from –1 to 0
b)
Undergo oxidation and oxidation number changes from –1 to 0
c)
Undergo reduction and oxidation number change from +5 to 0
d)
Undergo oxidation and oxidation number change from +5 to 0
Reset
