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>> JEE Main Advanced-Past Year Papers
Time : Two hours Max. Marks : 60
______________________________________________________________________Instructions 1. The Question Paper has 4 printed pages and has 12 questions. Please ensure that the copy of the Question Paper you have received contains all the questions. 2. Attempts ALL questions. Each question carries 5 marks. 3. Answer each question starting on a new page. The corresponding Question number must be written in the left margin. 4. Do not write more than one answers for the same question. In case you attempt a question more than once, please cancel the answer(s) you consider to be wrong. Otherwise, only the answer appearing last will be evaluated. 5. Use only Arabic numerals (0, 1, 2 .............9) in answering the questions irrespective of the language in which your answer. 6. Use of logarithmic tables is NOT PERMITTED. 7. Use of calculators is NOT PERMITTED. 8. Both magnitude and direction of vector quantities, if any, in your answer should be indicated clearly. 9. Irrational numbers, if any, in your answer need not be expressed in decimal form. 10. If the final answer appears in the form of a ratio or a product of two numbers, that need not to be further simplified. _______________________________________________________________ 1. Five isomeric para-disubstituted aromatic compounds A to E with molecular formula C8H8O2 were given for identification. Based on the following observation, give structures of the compounds. (i) Both A and B from a silver mirror with Tollen's reagent; also, B gives a positive test with FeCI3 solution. (ii) C gives positive idoform test. (iii) D is readily extracted in aqueous NaHCO3 solution. (iv) E on acid hydrolysis gives 1, 4-dihydroxybenzene. 2. 500 mL of 0.2 M aqueous solution of acetic acid is mixed with 500 mL of 0.2 M HCI at 250oC. (i) Calculate the degree of dissociation of acetic acid in the resulting solution and pH of the solution. (ii) If 6 g of NaOH is added to the above solution, determine the final pH. [Assume there is no change in volume on mixing; Ka of acetic acid is 1.75 × 10-5 mol L-1]. 3. Deduce the structures of [NiCI4]2- and [Ni(CN)4]2- considering the hybridization of the metal ion. Calculate the magnetic moment (spin only) of the species.
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