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Board Question Paper: March 2019, , BOARD QUESTION PAPER: MARCH 2019, CHEMISTRY, , , , , , Notes;, , All questions are compulsory, Draw neat, labelled diagrams and write balanced ¢, Question paper cons, , emical equations wherever necessary., , , , , , 's of 29 questions divided into FOUR sections, namely A, B, C and D., , , , , , , , , , , , , , , , , , , , , , iv Section Az Select and write the most appropriate answer from the given alternatives for Q. No 1 to 4 of, multiple choice type questions carrying one mark cach. Q, No 5 to 8 are very short answer type, questions carrying one mark each,, , \ Section B contains Q. No. 9 to 15 of short answer-I type questions carrying two marks each. Internal, choice is provided to only one question,, , vi, Section € contains Q, No. 16 to 26 of short answer-Il type questions carrying three marks each., Internal choice is provided to only one question., , Vii, Section D contains Q. No. 27 to 29 of long answer type questions carrying five marks each, Internal, choice is provided to each question, , viii, For each MCQs, correct answer must be written along with its alphabet,, , a CA) AMO aed (By crease (GC) ee /(D) sss... ete., , ix, Incase of MCQs, (i.e. Q. No. 1 to 4), evaluation would be done for the first attempt only., , Xx Start each section on new page., , xi. Figures to the right indicate full marks,, , xii, Use log table if necessary, Use of calculator is not allowed., , Given:, , R=8314)K' mol",, Atomic weights: H = 1, C = 12,N = 14,0 = 16, Cl=35., SECTION A, , Q.1 A compound used as pistachio flavour in ice cream is : () 18}, (A) _ vanillin (B) acetophenone, (C) muscone (D) butyraldehyde, , Q.2 Oxidation states of scandiumare___. Q), (A) +1,+2 (Bye plats:, , (C) +2,+3 (D) +3,+4, , Q.3 In Van Arkel method for refining zirconium or titanium, the halogen used is ‘ (), (A) fluorine (B) chlorine, (C) bromine (D) iodine, , Q.4 A system absorbs 6 kJ of heat and does 1,5 kJ of work on its surroundings, The change in internal, energy is : (), (A) ~75kI (B) =4,5 ki, (C) +45k) (D) +75kI, , Ow Q, , Scanned with CamScanner ~

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Chemistry 7, , Q.5 Write the molecular formula of novestrol. (iy, Q.6 Write the number of hydroxy! groups present in @-D— (+) — Glucopyranose (trans) ay, Q.7 What is Nessler’s reagent? a), , Q.8 What is the ratio of octahedral holes to the number of anions in hexagonal closed packed structure? (1), , SECTION B, , Q.9 What are ethers? How are they classified? (2) [l4J, Q.10 What are antacids? Write the main constituents of dettol. (2), Q.11 Draw a neat, labelled diagram of electrolytic cell for the extraction of aluminium. Q, Q.12 How many faradays of electricity are required to produce 6 g of Mg from MgCl,? @), , OR, , The molar conductivity of 0.05 M BaCl, solution at 25 °C is 223 2 cm* mol". What is its, conductivity?, , Q.13 Derive van’t Hoff general solution equation. @Q), Q.14 Write the conditions for maximum work done by the system. (2), Q.I5 Write balanced chemical equations for the following: @), , (i) Action of sodium metal on ethanol, (ii) Action of zine dust on phenol, , , , , , , , , , SECTION C, , Q.16 Write chemical reactions to prepare the following polymers: (3) [33], , (i) Teflon, , (ii) Nylon-—6, , (iii) Dextron, Q.17 How is glucose prepared by commercial method? How is peptide linkage formed? G), Q.18 Write a short note on Hoffmann elimination. GB), Q.19 What is the action of the following on ethyl bromide (3), , (i) alcoholic solutions of potassium hydroxide, (ii) moist silver oxide, (iii) silver acetate?, , Q.20 What is effective atomic number? Calculate effective atomic number of copper (Z = 29) in, , [Cu(NH;).}*. @), Q.21 Write chemical reactions for differen steps in the manufacture of sulphuric acid by lead chamber, process. Draw the structure of phosphorus pentachloride, @), , Scanned with CamScanner

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Time: 3 Hours, , , , , , , , , mr Ue, , a, , , , , , , , , , Gener, , , , Instructions :, question paper is divided into FOUR sections, Section A; Q_ No,! contains Ten multiple choice type of questions carrying One mark each, , Q. No, 2 contains Eight very short answer type of questions carrying One mark, each, , Section By Q.No.3 to Q. No. 14 are Twelve short answer type of questions carrying Two marks, each. (Attempt any Eight)., , Section: Q No. 15 to Q. No.26 contain Twelve short answer type of questions carrying Three, marks each. (Attempt any Eight), , , , , , , , , , , , 4. SectionD: Q No. 27 to Q. No. 3] are Five long answer type of questions carrying Four marks, each, (Attempt any Three), 3. Use of log table is allowed. Use of calculator is not allowed., ° Figures to the right indicate full marks., 7. For each MCQ, correct answer must be written along with its alphabet, e.g. (a) ....... DD) fesasee, XC) seassesetti( A) zncresc etc., 8. Physical constant:, Avogadro's Number = Na = 6.022 x 10°, j, Q.1. Select and write correct answer of the following questions: [10||7], i. Identify synthetic polymer amongst the following:, (A) Linen (B) Jute (C) Silk (D) Terylene, ii Which among the following hydrides is NOT a reducing agent?, (A) 120 (B) H2S (C) HyTe (D) H3Se, iii During oxidation of ferrous sulphate using mixture of dil. H2SO, and potassium dichromate;, oxidation state of chromium changes from, (A) +6tor2 (B) +6to+3 (C) +6to+!] (D) +6to+4, iv _ Identify complex ion in which effective atomic number of the central metal ion is 35., (Given At. Number of Co = 27, Fe = 26, Zn = 30), (A) [Zn(NHs)sJ° — (B)_[Fe(CN)e)*" (©) [Fe(CN)e]” (BD) [Co(NH)g}”*, v. Conversion of methyl chloride into methyl! fluoride is known as y, (A) Finkelstein reaction (B) Swarts reaction }, (C) Williamson's synthesis (D) Wurtz reaction, vi The number of moles of methyl todide required to prepare tetramethyl ammonium iodide from, | mole of methy| amine is/are: j, (A) 1 (B) 2 (eyes (Db) 4 }, vii, , Name the reagent which on reaction with glucose confirms the presence of five hydroxyl groups in, glucose, , (A) Hydroxyl amine (B) Bromine water, (C) Dilute nitric acid (D) Acetic anhydride, , Scanned with CamScanner