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WorksheetsIntroductory activity
Total questions: 10
Worksheet time: 4mins
Name
Class
Date
1.
What elements are present in Fe₂O₃?
a)
Iron and Oxygen
b)
Iron and Hydrogen
c)
Iron and Sulfur
d)
Fluorine and Oxygen
2.
How many oxygen atoms are in Fe₂O₃?
a)
1
b)
2
c)
3
d)
4
3.
What is the oxidation state of Fe in Fe₂O₃?
a)
+2
b)
+3
c)
0
d)
-3
4.
What is the oxidation state of Na in NaCl?
a)
+1
b)
0
c)
-1
d)
+2
5.
How many atoms are present in a CO₂ molecule?
a)
1
b)
2
c)
3
d)
0
6.
What is the oxidation state of Carbon in CO₂?
a)
-4
b)
+4
c)
-2
d)
+2
7.
What elements are present in H₂SO₄?
a)
Hydrogen, Sulfur, and Oxygen
b)
Hydrogen, Sodium, and Oxygen
c)
Hydrogen, Sulfur, and Chlorine
d)
Sulfur, Oxygen, and Calcium
8.
What is the oxidation state of Sulfur in H₂SO₄?
a)
+2
b)
+4
c)
+6
d)
-2
9.
How many aluminum atoms are in Al₂O₃?
a)
1
b)
2
c)
4
d)
5
10.
What is the oxidation state of Copper in CuSO₄?
a)
+1
b)
-3
c)
+3
d)
+2
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