Concept explainers
Interpretation:
The option corresponding to the correct oxidation number of sulfur in the ion
Concept Introduction:
The oxidation state or number in a compound is the charge present on the individual atom if all the bonds are assumed to be ionic. The oxidation number is assigned by the following set of rules:
1. The oxidation number present on a neutral compound is always zero.
2. The oxidation number of atoms present in an element in the pure form is zero.
3. In the compounds, if halogens are present the oxidation number of halogens is
4. The oxidation numbers of Group
5. The common oxidation number of oxygen in most compounds is
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Chapter 5 Solutions
Chemistry for Today: General, Organic, and Biochemistry
- Chromium has been investigated as a coating for steel cans. The thickness of the chromium film is determined by dissolving a sample of a can in acid and oxidizing the resulting Cr3+ to Cr2O72 with the peroxydisulfate ion: S2O82(aq) + Cr3+(aq) + H2O(l) Cr2O72(aq) + SO42(aq) + H+(aq) (Unbalanced) After removal of unreacted S2O82 an excess of ferrous ammonium sulfate [Fe(NH4)2(SO4)26H2O] is added, reacting with Cr2O72 produced from the first reaction. The unreacted Fe2+ from the excess ferrous ammonium sulfate is titrated with a separate K2Cr2O7 solution. The reaction is: H+(aq) + Fe2+(aq) + Cr2O72(aq) Fe3+(aq) + Cr3+(aq) + H2O(l) (Unbalanced) a. Write balanced chemical equations for the two reactions. b. In one analysis, a 40.0-cm2 sample of a chromium-plated can was treated according to this procedure. After dissolution and removal of excess S2O82, 3.000 g of Fe(NH4)2(SO4)26H2O was added. It took 8.58 mL of 0.0520 M K2Cr2O7 solution to completely react with the excess Fe2+. Calculate the thickness of the chromium film on the can. (The density of chromium is 7.19 g/cm3)arrow_forwardWhat is the oxidation number for P within the polyatomic ion: Be2P2O7 a. +2 b. +6 c. -3 d. +5arrow_forward5 items multiple choice 35. What is the oxidation number of chlorine in HClO4? A. +1 B. +6 C. +7 D. -8 36. How many electrons were lost/gained in the following redox reaction 2K2Cr2O7 + 2H2O + 3S 4KOH + 2Cr2O3 + 3SO2? A. 2 B. 3 C. 6 D. 12 37. In the reaction, Fe2+ + Cr2O72- Fe3+ + Cr3+, which is involved in oxidation? A. Fe B. Cr2O7 C. Cr D. O 38. Which of the following half reactions in CORRECT? A. I2 + 1e- I- B. Cu2+ + 2e- Cu+ C. Zn2+ + 2e- Zn D. 2H+ + 2e- H2- 39. The following are examples of spontaneous reactions EXCEPT A. Water freezes spontaneously below 0ᵒC, and ice melts spontaneously above 0ᵒC. B. Heat flows from a colder one but reverse happens spontaneously. C. A waterfall runs downhill, but never up spontaneously. D. A lump of sugar spontaneously dissolves in a cup of coffee, but dissolved sugar does not spontaneously reappear in its original form. 40. For an equilibrium process, the free-energy change ∆G is A. less than zero. B. greater than zero. C. equal to…arrow_forward
- 4. For the reaction the product will be: a. 1 y 2 b. 2 c. 1 d. 4 e. 3arrow_forward36. How many electrons were lost/gained in the following redox reaction 2K2Cr2O7 + 2H2O + 3S 4KOH + 2Cr2O3 + 3SO2? A. 2 B. 3 C. 6 D. 12arrow_forward14. What is the oxidation number of N in NO2-1? C. -2 15. What is oxidation number of Cr in Cr2072-? а. -3 b. +4 d. +3 а. -2 b. +2 С. +6 d. +12arrow_forward
- What is the oxidation state of element X in the compound H3X30? a. +3 b. +2 с. +1 d. 0 е. -1 f. -2 g. -3arrow_forwardIn nitrous acid (HNO2) the oxidation state of N is. . 1. +3 2. -3 3. +5 4. +6 а. 1 O b. 2 O c. 3 O d. 4arrow_forwardThe oxidation number of chromium in sodium dichromate, Na2Cr2O7, isa. +1 b. +2 c. +3 d. +4 e. +5 f. +6 g. +7 h. +8 i. +9 j.+10 k. 0arrow_forward
- What is the oxidation number of element underlined in the following element, compound and ion? a. Al³+ b. C1037 c. 03 d. PCla e. Cr₂072-arrow_forwardIn which two compounds does nitrogen have the same oxidation number? N₂O3 and HNO3 N₂O5 and HNO3 NO₂ and N₂03 N₂O4 and HNO2 HNO2 and NH3 A. B. C. D. E.arrow_forwardHow much coulombs will it take to plate out 15 g of Fe from a solution of FeCl2? a. 51,700.92 b. 52,680.95 c. 51,849.29 d. 52,860.50arrow_forward
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