Trending ▼  

ISC Specimen 2015 Chemistry Paper 2 (II of V)

3 pages, 17 questions, 0 questions with responses, 0 total responses
Isc
Indian School Certificate Examination (ISC), New Delhi
+Fave Message
 Home > isc >

Formatting page ...
 

SPECIMEN PAPER II OF V CHEMISTRY PAPER 2 (PRACTICAL) (Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) ---------------------------------------------------------------------------------------------------------------ALL ANSWERS MUST BE WRITTEN IN THE ANSWER BOOKLET PROVIDED SEPARATELY. Question 1 is an oxidation-reduction titration in which sufficient working details are given. All essential working must be shown. Question 2 is an exercise dealing with the identification of organic compounds. Credit will be given for precise observations recorded and for well drawn deductions. Question 3 is an exercise in qualitative analysis. ---------------------------------------------------------------------------------------------------------------Read the questions carefully and follow the given instructions. Attempt all questions. All working, including rough work, should be done on the same sheet as the rest of the answer. The intended marks for questions or parts of questions are given in brackets [ ]. Mathematical Tables are provided. ---------------------------------------------------------------------------------------------------------------Attempt all questions. Question 1 [8] You are provided with two solutions as follows: C-10 is a solution prepared by dissolving 1.04 gms of potassium manganate (VII) KMnO4 per litre. C-11 is a solution prepared by dissolving 13.4 gms of hydrated ammonium iron (II) sulphate crystals, (NH4)2SO4.FeSO4.xH2O per litre. PROCEDURE: Rinse and fill the burette with the solution C-10 (KMnO4). Pipette out 20 ml or 25 ml of C-11 (hydrated ammonium iron (II) sulphate) into a clean conical flask. To this, add 20ml of dilute sulphuric acid C-12, specially provided for titration. Titrate the solution with C-10 (KMnO4) till one drop of this gives a light permanent pink colour to the solution in the conical flask. Ensure that the pink colour does not disappear on shaking the contents of the conical flask. Repeat the experiment to get at least two concordant readings. Tabulate your readings. ---------------------------------------------------------------------------------------------------------------------------50 ISC SPECIMEN QUESTION PAPER 2015

Formatting page ...
 

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 + 3H2SO4 K2SO4 + 2MnSO4 + 3H2O + 5[O] 10(NH4)2SO4.FeSO4.xH2O+5H2SO4 + 5[O] 10(NH4)2SO4 + 5Fe3(SO4)3+ 10 xH2O + 5H2O Relative atomic masses: K = 39 Fe = 56 S = 32 N = 14 H=1 Mn = 55 O = 16 Calculate the following: (i) The molarity* of potassium manganate (VII) solution C-10. (ii) The molarity* of hydrated ammonium iron (II) sulphate solution C-11. (iii) The molecular mass of hydrated ammonium iron (II) sulphate deduced from the experimental data. (iv) The numerical value of x. *Note: Molarity must be calculated upto at least 4 decimal places. **Question 2 [5] Substances C-13 and C-14 are organic compounds. Carry out the following experiments and note all the changes taking place at each step of the experiments. Note the smell of the substance formed, colour of the substance obtained, colour of the precipitate formed, and solubility in excess of the reagent and any other observations you may have. State the identity of each compound on the basis of the experiments and observational changes. PROCEDURE: (a) Substance C-13: Take 3 4 drops of C-13 in a test tube, add about 0.5 grams of potassium 1. hydrogen sulphate and heat strongly. Take 0.2 grams of borax in a test tube and add 5 ml of water to it. Shake well to 2. get a clear solution. To this, add 2 drops of phenolphthalein solution. Now add 2- 3 drops of C-13 to this, shake well, warm and cool. Take about 4 5 drops of C-13 in a test tube. Add about 1 ml of copper 3. sulphate solution followed by a few drops of Sodium Hydroxide solution. ---------------------------------------------------------------------------------------------------------------------------51 ISC SPECIMEN QUESTION PAPER 2015

Formatting page ...
 

(b) Substance C-14: Take 2 ml freshly prepared Sodium nitroprusside aqueous solution. To this, 1. add 2 ml of C-14 followed by Sodium Hydroxide solution drop by drop, and warm. Take 2 ml of C-14 and to this add 2 ml of saturated Sodium Bisulphite solution. 2. Shake. Take 1 ml of C-14. To this, add 2 ml of Iodine solution followed by 10% 3. Sodium Hydroxide solution. Warm on a water bath and cool. Take 2 ml of C-14 in a test tube, add 1 ml of Mercuric chloride solution. Now, 4. add Sodium Hydroxide solution drop-wise and shake. **Note: Question 2 will be set from any one OR a combination of any two of the following: Rate of Reaction Identification of Organic Compounds pH determination Test for carbohydrates and proteins. Question 3 [7] Analyse qualitatively the substance C-15 which contains two anions and two cations. Identify these ions. (a) While testing for anions you must mention: (i) How the solution/soda extract was prepared. (ii) How the gases were identified. (iii) The confirmatory test for anions. Show the results as required to the Visiting Examiner. (b) While testing for cations you must mention: (i) How the original solution for group analysis was prepared. (ii) The formal group analysis with pertinent group reagents. (iii) The confirmatory test for each cation. Show the results as required to the Visiting Examiner. Note: Use of qualitative analysis booklet/table is not allowed. Question 4 Show the following to the Visiting Examiner for assessment: (a) Project [7] (b) Chemistry Practical File. [3] ---------------------------------------------------------------------------------------------------------------------------52 ISC SPECIMEN QUESTION PAPER 2015

 

  Print intermediate debugging step

Show debugging info


 

Additional Info : ISC Board Specimen Question Paper 2015 Chemistry Paper 2 Practical II of V
Tags : ISC Board Specimen Question Paper 2015 Chemistry Paper 2 Practical II of V, Chemistry solved sample mock guess question paper, cisce isc class XII chemistry syllabus, ISC Board, Council for the Indian School Certificate Examinations, ISC 2016 - 2017 Examination, 2017, 2016, 2015, 2014, 2013, 2012, 2011, ISC Solved Specimen Question Papers 2016 - 2017, ISC Solved Mock Guess Exam Papers, ISC Board Model Paper with Answers, Detailed Solutions & Explanations, isc sample question bank, past / old / last year online test papers, syllabus, online coaching.  

© 2010 - 2017 ResPaper. Terms of ServiceContact Us Advertise with us

 

NEW: Save page on Android App
isc chat