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ISC Class XII Analysis Of Pupil Performance 2016 : Chemistry

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CHEMISTRY PAPER 2 (PRACTICAL) Attempt all questions Question 1 [8] You are provided with two solutions as follows: C-10 is a solution containing 1 60gms of potassium manganate (VII), KMnO4 per litre. C- 11 is a solution prepared by dissolving 20 3gms of hydrated ammonium iron (II) sulphate crystals, (NH4)2SO4.FeSO4.xH2O per litre. PROCEDURE: Rinse and fill the burette with the given solution C-10 (KMnO4). Pipette out 20 ml or 25ml of C-11 (hydrated ammonium iron (II) sulphate solution) and transfer into a clean conical flask. To this, add 20 ml of C-12 (dilute sulphuric acid) specially provided for titration. Titrate the solution in the conical flask with C-10 (KMnO4) slowly till one drop of this gives a light permanent pink colour to the solution C-11 in the flask. The pink colour should not disappear on shaking the contents in the conical flask. Repeat the above procedure to get at least two concordant readings. Tabulate your readings. State: (a) The capacity of the pipette used. (b) The titre value you intend to use in your calculations. Show the titre value to the Visiting Examiner. The equations for the above reactions are as follows: 2KMnO4 + 8H2SO4 + 10(NH4)2SO4.FeSO4.xH2O K2SO4 + 2MnSO4 + 10(NH4)2SO4 + 5Fe2(SO4)3 + 8H2O + 10 xH2O The ionic equation for the reaction is: +2 + 2+ +3 2MnO 4 + 10Fe + 16H 2Mn + 10Fe + 8H2O Relative atomic masses: K = 39 Fe = 56 Mn = 55 S = 32 N = 14 H = 1 O = 16 Calculate the following: (i) The molarity of the solution of potassium manganate(VII) C-10. (ii) The molarity of hydrated ammonium iron(II) sulphate solution C-11. 65

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Additional Info : ISC Class XII Analysis Of Pupil Performance 2016 : Chemistry
Tags : ISC Board, Class 11th, Class 12th, NDA/NA Entrance Examination

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