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Topic 11: Redox a
. nd electrochemistry

6. Oxidation numbers: Determining formula in which an atom has a certain oxidation number

1. In which compound does hydrogen have a negative oxidation number?
1) NaH 3) NaOH
2) H3PO4 4) H2

2. In which substance does oxygen have a positive oxidation number?
1) O2 3) H2O2
2) OF2 4) H2SO4

3. Oxygen has an oxidation number of -2 in
1) O2 3) NO2

2) Na2O2 4) OF2
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4. In which compound does chlorine have an oxidation number of +5?
1) HClO4

3) HClO

2) HClO2 4) HClO3

5. In which substance does bromine has oxidation number of +3
1) KBrO 3) KBrO2
2) KBrO3 4) KBrO4
6. In which compound does iodine have the highest oxidation number?
1) KIO3 3) KIO2

2) KIO 4) KI
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7. In which formula does Nitrogen have a +3 charge?
1) NO2
3) NO3

2) NO2 4) NO3
-
-

8. In which substance does sulfur have a negative oxidation number?
1) Na2S 3) CaSO4
2) S
4) SO2
9. In which substance does phosphorous have a +3 oxidation number?
1) P4O10 3) Ca3(PO4)2
2) PCl5
4) KH2PO3

10. Sulfur has an oxidation number of +6 in which two formulas? 2-

2-
3) SO2 and SO4
1) SO3 and SO4
2) H2SO4 and SO2 4) HSO4 and S2O3
2-

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