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Worksheet: Oxidation Numbers Name___________________ 1. Give the oxidation numbers of all the elements in the following molecules and ions: a. SO, SO2, SO32-, SO3, SO42- S=+2 O=-2 S=+4 O=-2 S=+6 O=-2 S=+4 O=-2 S=+6 b. ClO2, ClO-, ClO2-, c. N2O, NO, NO2, ClO3-, ClO4- N2O4, N2O5, NO2-, NO3- 2. Determine the oxidation number of the sulfur atom: a. H2S b. S d. S2- c. H2SO4 e. HS- f. SO2 g. SO3 3. Indicate the oxidation number of phosphorus in each of the following compounds: +5 _____ a. HPO3 +5 _____ d. H3PO4 b. H3PO2 +1 _____ +5 e. H4P2O7 _____ c. H3PO3 +3 _____ +5 f. H5P3O10 _____ 4. Give oxidation numbers for the underlined atoms in these molecules and ions: k. MoO42- +6 H3AsO3 +3 l. MnO4- +7 h. SbF6- +5 m. PtCl42- SnF2 +2 i. TiO2 +4 n. O2 0 Al2O3 +3 j. o. O3 0 a. Cs2O +1 f. ClF3 b. PtCl62- +4 g. c. CaI2 +2 d. e. +3 P4 0 CHEMISTRY: A Study of Matter © 2004, GPB 14.4 +2