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Topic 11: Redox and electrochemistry
4. Oxidation numbers: Determining oxidation number of an element with multiple positive charges
1. The oxidation number of sulfur in the compound SO3 is
1) -3 2) +3 3) +6 4) -6
2. What is the oxidation number of iodine in KIO4?
1) +1 2) -1 3) + 7 4) -7
3. What is the oxidation number of nitrogen in HNO3?
1) +5 2) +4 3) -3 4) -1
4. What is the oxidation number of Pt in K2PtCl6?
1) -4 2) +4 3) -2 4) +2
5. In Na2Cr2O7, the oxidation number of chromium is
Teacher Preview Copy
1) +2 2) +6 3) +7 4) +12
6. What is the oxidation number of carbon in NaHCO3?
1) -2 2) +2 3) -4 4) +4
7. What are the two oxidation states of nitrogen in the compound NH4NO3?
1) -3 and +5
2) -3 and -5 3) +3 and +5 4) +3 and -5
8. Below, two compounds of chlorine are given:
Compound A: Cl2O Compound B: HClO
Which is true of the oxidation number of chlorine in Compound A and B?
1) Chlorine oxidation number is +2 in A, but a +1 in B
2) Chlorine oxidation number is +1 in A, but a +2 in B
3) Chlorine oxidation number is +2 in both A and B
1) -2 Teacher Preview Copy
4) Chlorine oxidation number is +1 in both A and B
5. Oxidation number: Determining oxidation number of an element in ions
-
1. The oxidation number of sulfur in hydrogen sulfate, HSO4 is
1) +1 2) -2 3) +6 4) -4
-
2. What is the oxidation number of nitrogen in the ion NO3 ?
1) +6 2) -3 3) +5 4) -1
+
3. The oxidation number of hydrogen in the hydronium ion, H3O is
1) +1 2) -1 3) 0 4) +3
2-
4. What is the oxidation number of S in the ion SO4
2) -6 3) +4 4) +6
3-
5. The oxidation number of phosphorous in a phosphate ion, PO4 is
1) +5 2) -3 3) +3 4) +8
+
6. What is the oxidation number of nitrogen in ammonium ion, NH4 ?
1) -3 2) +2 3) +4 4) +5
2-
7. What is the oxidation number of Cr in the polyatomic ion, Cr2O7 ?
1) +7 2) +6 3) -2 4) +2
2-
8. In the ion O2 , what is the oxidation number of O?
1) -1 2) +1 3) -2 4) 0
318 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
Topic 11: Redox and electrochemistry
4. Oxidation numbers: Determining oxidation number of an element with multiple positive charges
1. The oxidation number of sulfur in the compound SO3 is
1) -3 2) +3 3) +6 4) -6
2. What is the oxidation number of iodine in KIO4?
1) +1 2) -1 3) + 7 4) -7
3. What is the oxidation number of nitrogen in HNO3?
1) +5 2) +4 3) -3 4) -1
4. What is the oxidation number of Pt in K2PtCl6?
1) -4 2) +4 3) -2 4) +2
5. In Na2Cr2O7, the oxidation number of chromium is
Teacher Preview Copy
1) +2 2) +6 3) +7 4) +12
6. What is the oxidation number of carbon in NaHCO3?
1) -2 2) +2 3) -4 4) +4
7. What are the two oxidation states of nitrogen in the compound NH4NO3?
1) -3 and +5
2) -3 and -5 3) +3 and +5 4) +3 and -5
8. Below, two compounds of chlorine are given:
Compound A: Cl2O Compound B: HClO
Which is true of the oxidation number of chlorine in Compound A and B?
1) Chlorine oxidation number is +2 in A, but a +1 in B
2) Chlorine oxidation number is +1 in A, but a +2 in B
3) Chlorine oxidation number is +2 in both A and B
1) -2 Teacher Preview Copy
4) Chlorine oxidation number is +1 in both A and B
5. Oxidation number: Determining oxidation number of an element in ions
-
1. The oxidation number of sulfur in hydrogen sulfate, HSO4 is
1) +1 2) -2 3) +6 4) -4
-
2. What is the oxidation number of nitrogen in the ion NO3 ?
1) +6 2) -3 3) +5 4) -1
+
3. The oxidation number of hydrogen in the hydronium ion, H3O is
1) +1 2) -1 3) 0 4) +3
2-
4. What is the oxidation number of S in the ion SO4
2) -6 3) +4 4) +6
3-
5. The oxidation number of phosphorous in a phosphate ion, PO4 is
1) +5 2) -3 3) +3 4) +8
+
6. What is the oxidation number of nitrogen in ammonium ion, NH4 ?
1) -3 2) +2 3) +4 4) +5
2-
7. What is the oxidation number of Cr in the polyatomic ion, Cr2O7 ?
1) +7 2) +6 3) -2 4) +2
2-
8. In the ion O2 , what is the oxidation number of O?
1) -1 2) +1 3) -2 4) 0
318 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
