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Chemistry Oxidation Rules
Test Description: This test is based on the oxidation rules
Instructions: Answer all questions to get your test result.
1) In all compound except when combined with F or in a peroxide O has an oxidation number of
A
+1
B
-2
C
-1
D
+2
2) A pure element (not in combination) will have an oxidation number of
A
-1
B
+1
C
0
D
+2
3) The sum of the oxidation numbers of all atoms in a netrual compound is
A
+1
B
-1
C
-2
D
0
4) If an atom gives up two electrons it becomes an ion with a charge of
A
+1
B
-3
C
-2
D
+2
5) When hydrogen combines with a metal, the oxidation number of hydrogen is
A
+2
B
-1
C
0
D
+1
6) When an atom gains an electron what has taken place?
A
ionization
B
reduction
C
oxidation
D
neutralization
7) In the compound CaO if O has an oxidation number of -2 what is the oxidation number of Ca?
A
+2
B
0
C
+1
D
-1
8) If H has an oxidation number of +1 and S has an oxidation number of-2 what will be the correct chemical formula for a compound containing only those two elements?
A
H2S (note the numbers should be subscripts)
B
HS
C
HS2 (note the numbers should be subscripts)
D
H2S2 (note the numbers should be subscripts)
9) All elements in Group 1 of the periodic table have an oxidation number of
A
-1
B
+1
C
-2
D
+3
10) In a compound where elements gain or loss electrons a ____________________ bond is formed.
A
covalent
B
ionic
C
metallic
D
hydrogen
*select an answer for all questions
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