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WorksheetsFinding Oxidation Numbers
Total questions: 25
Worksheet time: 19mins
What is the oxidation number of chlorine in KCl?
+1
-1
+5
+7
What is the oxidation number of sulfur in H2SO4
0
-2
+2
+6
What is the change in oxidation number for oxygen, when it goes from O2 to MgO?
0 to +2
0 to -2
0 to -1
0 to +1
What is the change in oxidation number for chlorine as it goes from Cl2 to Cl-
0 to +1
+1 to 0
0 to -1
-1 to 0
What is the oxidation number of Au(s)?
+1
-1
+2
0
What is the oxidation number of O2(s)?
+1
-1
-2
0
What is the oxidation number of K+?
0
+1
-1
+2
What is the oxidation number of Br-(s)?
0
+1
-1
+3
In which formula does nitrogen have the lowest oxidation number?
N2
HNO2
HNO3
Li3N
In which formula does manganese have the highest oxidation number?
MnO
MnO2
Mn2O3
KMnO4
What is the oxidation number of sulfur in H2SO4?
0
-2
+2
+6
What is the oxidation number of chromium in K2Cr2O7?
0
+2
+3
+6
Which change in oxidation numbers shows a loss of electrons?
0 to -1
-1 to -2
-2 to -1
0 to -2
Which change in oxidation numbers shows a loss of electrons?
0 to -1
0 to +1
+2 to +1
+2 to 0
Which change in oxidation numbers shows the greatest gain in electrons?
0 to -3
+2 to -1
+5 to -3
0 to -2
What is the change in oxidation numbers as K+ goes to K
0 to +1
+1 to 0
+2 to 0
+2 to 0
What is oxidation number of copper in CuO?
0
+1
+2
none of the above
What is the oxidation number of iron in Fe2O3?
0
+2
+3
+1
In which substance does chlorine have the highest oxidation number?
Cl2
KCl
HClO4
NaClO3
What is the oxidation number of hydrogen in NH4+
0
-1
+1
-3
During oxidation, what happens to the oxidation number?
decreases
increases
remains the same
During reduction, what happens to the oxidation number?
decreases
increases
remains the same
What is the oxidation number of phosphorus in H3PO4?
0
+1
+3
+5
In which substance does carbon have the highest oxidation number?
C
CO
CO2
MgC2O4
Which statement is correct in regards to oxidation numbers
Oxygen is always -2
Hydrogen is always +1
Single, uncombined elements are always 0
Group 2 elements will form +1
