AQA Jun 2017 Paper 1 Q8

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0 8 0 8 . 1 15 When an acidified solution of sodium nitrite (NaNO2) is added to aqueous potassium iodide, iodine and nitrogen monoxide (NO) are formed. Give the oxidation state of nitrogen in the following species.NO2 NO 0 8 . 2 Write a half-equation for the conversion of NO2 into NOin an acidic solution 0 8 . 3 Write a half-equation for the conversion of I into I2 0 8 . 4 Write an overall ionic equation for the reaction of NO2in an acidic solution with I[2 marks] [1 mark] [1 mark] [1 mark] [1 mark] State the role of NO2in the reaction with I 0 8 . 5 Question 8 continues on the next page *15* Turn overIB/M/Jun17/7404/1<br /> 16In aqueous solution, nitrite ions react with acidified chlorate(V) ions according to the equation+ 5NO2+ 2H+Cl2 + 5NO3 2ClO3+ H2O A 25.0 cm3 sample of an aqueous solution of sodium nitrite required 27.40 cm3 of a 0.0200 mol dm3 solution of potassium chlorate(V) for complete reaction. Calculate the concentration, in g dm3, of sodium nitrite in the sample. [4 marks] Concentration of sodium nitrite g dm3 10 IB/M/Jun17/7404/1 0 8 . 6 *16*<br />

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