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Give the oxidation state of manganese in MnO₂
Iodide ions can reduce sulphuric acid to three different products.Write half-equations to show how two of these products are formed by reduction of sulphuric acid.
Cl₂ (g) + H₂O(l) ⇌ H⁺aq) + Cl⁻(aq) + HClO(aq)Use Le Chatelier's principle to explain why the green colour disappears when sodium hydroxide solution is added to this solution.
Chlorine reacts with cold water.(i) Write an equation for this reaction.
State the trend in reducing ability of the halide ions down Group VII.
Give the formulas of the two different chlorine-containing compounds that areformed when chlorine reacts with cold, dilute, aqueous sodium hydroxide.
Strontium chloride is used in toothpaste for sensitive teeth. Both strontium carbonate and strontium sulfate are white solids that are insoluble in water.(i) Write an equation for the reaction between strontium chloride solution and sodium sulfate solution. Include state symbols in your equation.
Strontium carbonate reacts with nitric acid to produce a solution of strontium nitrate. Strontium sulfate does not react with nitric acid.Describe briefly how you could obtain strontium sulfate from a mixture of strontium carbonate and strontium sulfate. You are not required to describe the purification of the strontium sulfate.
Explain why chlorine is used to kill bacteria in swimming pools, even though chlorine is toxic.
Write an equation for the equilibrium reaction that occurs when chlorine gas reactswith cold water.Give one reason why chlorine is used for the treatment of drinking water eventhough the gas is very toxic.
Write an equation for the reaction of chlorine with cold water.
Write the simplest ionic equation for the formation of the yellow precipitate
(iii) Deduce the half-equation for the reduction of the MnO4− ions in acidified solution to manganese
In bright sunlight, chlorine reacts with water to form oxygen as one of the products.Write an equation for this reaction.
Chlorine is formed when KMnO4 reacts with hydrochloric acid.The ionic equation for this redox reaction is16H+ + 2MnO₄⁻ + 10Cl⁻ -> 2Mn²⁺ + 8H₂O + 5Cl₂(i) Deduce the half-equation for the oxidation of chloride ions to chlorine.
(b) The pool manager maintains the water at a pH slightly greater than 7.0Explain how this affects the equilibrium established when chlorine is added to water.
Deduce the half-equation for the formation of iodine from iodide ions.
Write an ionic equation for the reaction between chlorine and cold dilute sodium hydroxide solution. Give the oxidation state of chlorine in each of the chlorine-containing ions formed.
In sunlight, chlorine can also oxidise water slowly to form oxygen.a) Equation:b) Oxidation state of chlorine in the species formed
A solution of magnesium sulfate is sometimes given as first aid to someone who has swallowed barium chloride.Explain why drinking magnesium sulfate solution is effective in the treatment of barium poisoning.

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