WorksheetsH.W1-OXIDATION NUMBER
Total questions: 10
Worksheet time: 25mins
Name
Class
Date
1.
Oxidation number of Fe in Fe2+ ion:
a)
0
b)
-2
c)
+2
d)
+3
2.
Which element has the same oxidation number in all of its compounds?
a)
oxygen
b)
fluorine
c)
hydrogen
d)
chlorine
3.
Oxidation number of S in S8
a)
0
b)
+2
c)
-4
d)
+6
4.
Element that only has a stable oxidation number of +1:
a)
Na
b)
Cl
c)
Ca
d)
Al
5.
What is the oxidation number of an atom of nitrogen in the compound N2?
a)
0
b)
+3
c)
-3
d)
-6
6.
What is the oxidation number of phosphorus in H3PO4?
a)
+1
b)
+4
c)
+5
d)
+8
7.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
8.
What is oxidation number of Cr in
Cr2O7-2
a)
-2
b)
+2
c)
+6
d)
+12
9.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
10.
Oxidation number of O in the compound H2O2
a)
0
b)
-1
c)
-2
d)
+2
100 %
