2. HPHS4068/ Ex 4 Ch 7-8/P3 Sulphur is an element which exhibits different oxidation numbers in different substances. (a

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2 Hphs4068 Ex 4 Ch 7 8 P3 Sulphur Is An Element Which Exhibits Different Oxidation Numbers In Different Substances A 1 (58.89 KiB) Viewed 21 times

2. HPHS4068/ Ex 4 Ch 7-8/P3 Sulphur is an element which exhibits different oxidation numbers in different substances. (a) In each of the following reactions, indicate whether the sulphur-containing reactant is an oxidizing agent or a reducing agent. Explain your answers. (1) 2PbS(s) + 302(g) → 2PbO(s) + 250_() (ii) Zn(s) + 2H2SO4() → ZnSO4(s) + SO2(g) + 2H20(1) (b) In each of the following reactions, indicate whether sulphur undergoes oxidation or reduction. Explain your answers. (1) S(s) + O2(g) → SO2(g) (ii) S(s) + Fe(s) → FeS(s) + [8 marks) 3. A student bubbled sulphur dioxide gas into acidified potassium permanganate solution. (a) Write an ionic half equation for the reduction in this reaction. (b) Write an ionic half equation for the oxidation in this reaction. (c) Write a balanced redox ionic equation for this reaction. (d) Describe any change in the oxidation number of manganese in this reaction. (e) Describe any change in the oxidation number of sulphur in this reaction. (1) Describe the expected observation(s) during the reaction. [6 marks] 4. For each of the following reactions, (1) write an equation (ii) determine what is oxidized and what is reduced by the use of oxidation number concept. (a) Copper is added to silver nitrate solution. (b) Iron is added to dilute hydrochloric acid. (c) Acidified potassium permanganate solution is mixed with iron(II) sulphate solution. [9 marks)