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WorksheetsChapter 7 - oxidation number
Total questions: 25
Worksheet time: 21mins
Name
Class
Date
1.
What is the oxidation state of sulfur in H2SO4?
a)
-2
b)
-5
c)
+6
d)
+4
2.
The sum of all oxidation numbers in a neutral compound is ___.
a)
0
b)
1
c)
-1
d)
depends on the compound
3.
What is the oxidation of C in CH4?
a)
-4
b)
-1
c)
+4
d)
+1
4.
What is the oxidation number of Ca in Ca3N2?
a)
+3
b)
+2
c)
-3
d)
-2
5.
What element's don't have oxidation numbers?
a)
alkali metals
b)
noble gases
c)
halogens
d)
alkaline earth metals
6.
What is oxidation number of Mn in MnO2 ?
a)
0
b)
+2
c)
-2
d)
+4
7.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
8.
What is the oxidation number of O in CO2?
a)
+2
b)
-1
c)
+4
d)
-2
9.
A chemical reaction that involves a gain/loss of electrons is called:
a)
Double Replacement
b)
Neutralization
c)
Oxidation-Reduction
d)
Hydrolysis
10.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
11.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
12.
What are valence electrons?
a)
Number of electrons in the outer most energy level
b)
Number of electrons gained or lost
c)
Number of electrons in the inner energy level
d)
Number of electrons
13.
What are oxidation numbers?
a)
Number of electrons in the outer most energy level
b)
Number of protons
c)
Electrons gained or lost in chemical bonding
d)
Number of neutrons gained or lost
14.
What is the oxidation number of N in NO21- ?
a)
-3
b)
+4
c)
-2
d)
+3
15.
What is the oxidation number of S in SO4 2- ?
a)
-2
b)
+2
c)
+6
d)
-4
16.
What is oxidation number of Cr in
Cr2O72-?
Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
17.
What is oxidation number of P in K3PO4?
a)
+1
b)
+5
c)
-2
d)
0
18.
What are oxidation numbers?
a)
Number of electrons in the outer most energy level
b)
Number of protons
c)
Electrons gained or lost in chemical bonding
d)
Number of neutrons gained or lost
19.
How many valence electrons do elements in Group 15 have?
a)
15
b)
5
c)
4
20.
Oxidation number of O in its stable elemental form, O2:
a)
0
b)
-1
c)
-2
d)
+2
21.
Oxidation number of O in the compound H2O2:
a)
0
b)
-1
c)
-2
d)
+2
22.
Oxidation number of S in H2S:
a)
0
b)
-2
c)
+4
d)
+6
23.
Oxidation number of S in SO2:
a)
0
b)
-2
c)
+4
d)
+6
24.
Oxidation number of S in SO42-:
a)
0
b)
-2
c)
+4
d)
+6
25.
Oxidation number of O in the ion H3O+:
a)
0
b)
-1
c)
-2
d)
+2
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