All India Test series 2010 Part –IV-A (IIT – JEE Pattern) Instructions and Marking Scheme for the Paper The total time for execution of your preparation is 3 hrs, for each paper of Chemistry, Physics& Mathematics · Section I contains 6 multiple choice questions having only one option correct, each having 3 marks for correct answer, zero marks if no bubble is darken and -1 mark for incorrect answer. · Section II contains 6 multiple choice questions having one or more than one option correct , each having 4 marks if you darken the correct bubbles, zero marks if no bubble is darken and -1 mark will awarded for all other cases. · Section III contains 2 sets of Comprehensions type questions. Each set consists of a paragraph followed by 3 questions having only one option correct, , each having 4 marks if you darken the correct bubbles, zero marks if no bubble is darken and -1 mark will awarded for all other cases. · Section IV contains 2 Matrix match questions. For each questions in this section, you will be awarded 2 marks for each row in which you have darkened the bubble(s) corresponding to the correct answer. Thus each question in this section carries a maximum of 8 marks. There is no negative marking for incorrect answer(s) for this section · Section V contains 4 Integer type answer questions, each having 4 marks if you darken the correct bubbles, zero marks if no bubble is darken and -1 mark will awarded for all other cases. “If Learn to Shine from the STARS….. Than the sky will be your next limit All India Test series 2010 Part –IV-A (IIT – JEE Pattern) SECTION – I Single Correct choice Type (Q. 1 -6) 1. An alloy of copper, silver and gold is found to have cubic lattice in which Cu atoms constitute ccp. If Ah atoms are located at the edge centres and Au atom is present at body centre, the alloy will have the formula (a) CuAgAu (b) Cu4Ag4Au (c) Cu4Ag3Au (d) Cu4Ag6Au 2. In a compound –E electrophilic substitution has occurred. The substituent –E are methyl, , CCl Cl, CH 3 2 - - and . CHCl2 - The correct increasing order towards electrophilic substitution is (a) 3 2 2 3 CCl CHCl Cl CH CH - < - < - < - (b) 3 2 2 3 CH CHCl Cl CH CCl – - < - < - < (c) 3 2 2 3 CCl Cl CH CHCl CH – - < - < - < (d) 3 2 2 3 CH Cl CH CHCl CCl – - < - < - < 3. Which of the following is the strongest base ? 4. Which is the correct sequence of decreasing O–O bond length in O2, 2 2O H and O3? (a) 2 3 2 2 O O O H > > (b) 2 2 3 2 O H O O > > (c) 3 2 2 2 O O H O > > (d) 2 2 2 3 O O H O > > 5. 3 2 HNO dil. (ii) HCl , (i)NaNO ¾ ¾ ¾ ¾ ¾ ® ¾ z. Here Z is (a) NO OH (b) ON OH (c) NO2 OH (d) OH (a) NH2 (b) NHCH3 (c) (d) NH2 CH3 CH2 – NH2 6. Which of the following is an aromatic species SECTION – II Multiple correct Choice Types (Q. 7 to 12) 7. In Na2O structure : (a) O2 – ions constitute ccp and Na+ ions occupy all the octahedral (b) O2 – ions constitute ccp and Na+ ions occupy all the tetrahedral holes (c) O2 – ions constitute ccp and Na+ ions occupy 50 % of tetrahedral holes and 100% octahedral holes (d) Na+ ions constitute ccp and O2– ions occupy half of octahedral holes. 8. Point out the false statement a. Brownian motion and Tyndall effect are shown by colloidal systems b. The colloidal solution of a liquid in liquid is called emulsion c. Hardy-Schulze law is related with coagulation of a sol d. Higher is the gold number, greater will be the protective power of a lyophilic colloid 9. In which of the following charge(s) hybridisation of the underlined atom is not affected ? (a) + + ® + 4 3 PH H H P (b) 3 2 2 3 BF S H S H F B ® ® + (c) O H HBO O B H 2 2 3 3 + ® (d) 3 2 HClO HClO O Cl 2H + ® 10. Amongst the following, the correct statement(s) is/are (a) NO has one unpaired electron in the antibonding molecular orbital (b) NO+ is more stable than O+2 (c) OF+ is more paramagnetic than Ne+2 (d) A pi bond is concentrated along the bond axis 11. Which of the following statements are correct? (a) Time required for 75% completion is 1.5 times of half-life for zero order reaction (b) Time needed for a definite fraction of first order reaction does not very with the initial concentration (a) NO2 H + (b) CH3 H + (c) N (d) All of the three (c) time for 25% reaction is one-third of half-life in second order process (d) Rate of zero order reaction gets doubled if the concentration of the reactant is increased to a two fold value 12. Which of the following statement(s) is/are correct ? (a) Adsorption is a non-spontaneous process (b) Surface energy decreases during the process of adsorption (c) Adsorption takes place with decrease of entropy (d) Physical adoorption is exothermic process whereas chemisorption is endothermic one SECTION – III Comprehension type(Q. 13 -15)(Q. 16 -18) Passage – I Ethanol is heated with a base in two separate test-tubes. In one test tube nothing except the two mentioned reactants were present. In another test-tube, malonic acid, CH2(COOH)2 was also added. The final products of both test-tubes add easily 1, 3-butadiene molecule. The product obtained in the first test tube can be converted into a product, identical in all respects with that obtained in the second testtuube 13.The respective reaction involved in the two test-tubes are : a) aldol condensation and Cannizzaro reaction (b) aldol condensation and Perkin reaction (c) aldol condensation and Knoevenagel reaction (d) aldol reaction and Claisen condensation 14. Which reaction is used for converting the final product of the first test-tube, identical to that of the final product of the second test-tube ? (a) Oxidation (b) Reduction (c) Dehydration (d) Cyclization 15. What would have been the final product when ethanal of the first test-tube is replaced by propanal? (a) CHO CHCH CH CH CH 2 2 3 = (b) CCHO CH CH CH CH 2 3 3 = (c) CHO CH C CH CH CH 2 3 3 = (d) CHO CH CH CH CH CH 3 3 - = Passage – II Earlier the term ‘Colloids’ was used for a category of substances. However, later, the term colloidal state of matter was preferred. Colloidal dispersions have been classified into different types depending upon the physical state of the dispersed phase and the dispersion medium or the nature of interactions between them or the nature of the colloidal particles. They are prepared in the industry or in the laboratory by a number of methods and then purified. Their properties have also been studied in detail, Hardy and Schulze made a substantial contribution in studying the coagulation of the colloids. The protective action of lyophilic colloids was studied by Zsingmondy and he introduced a term, called ‘gold number’. 16. Which of the following does not form a lyophilic colloid ? (a) Rubber dissolved in benzene (b) White of the egg dissolved into water (c) Common salt added into benzene (d) Stannous chloride solution added to gold chloride solution 17 .Critical micelle concentration (CMC) of soap solution lies in the range (a) 10–6 – 10–5 M (b) 10–5 – 10–4 M (c) 10–4 – 10–3 M (d) 10–3 – 10–2 M 18. Which of the following will have maximum flocculation value for arsenic sulphide sol ? (a) NaCl (b) KCl (c) BaCl2 (d) AlCl3 SECTION – IV Matrix-Match Type (Q. 19 – 20) 19. Match the following : Column – A Column – B (a) Adsorption involveing van der waal’s forces (b) Adsorption involving chemical forces (c) Positive adsorption of a solute on liquid surface (d) Negative adsorption of a solute on liquid surface (p) Specific and increases with temperature (q) Non-specific and decreases with temperature (r) Leads to decreases in surface tension of liquid (s) Leads to increase in surface tension of liquid 20. Match the following : Column – A Column – B SECTION – V Integer Answer (Q. 21 to 24) 21. Substances A and B react to form C and D and the reaction is found to be second order overall and second order in A. The rate constant at 300 K is 0.500 L mol-1min-1. What is the half-life of A (in min.) when 2 10 0 . 4 - ´ M of A is mixed with excess of B? 22. A student forgot to add the reaction mixture to the round bottomed flask at 27oC but put it on the flame. After a lapse of time, he realized his mistake. Using a pyrometer he found that the temperature of the flask was 477oC. What fraction of air would have expelled out ? (in Percent) 23. At room temperature, NH3 gas at 1 atm and HCl gas at P atm are allowed to effuse through identical pinholes from opposite ends of a glass tube of 1 metre length and of uniform cross-section. NH4Cl is first formed at a distance of 60 cm from the end through which HCl gas is sent in. What is the value of P ? 24. A hydrogenation reaction is carried out at 500 K. If the same reaction is carried out in presence of a catalyst at the same rate, the temperature required is 400 K. Calculate the activation energy of the reaction if the catalyst lowers the activation energy barrier by 20 kJ mol–1. 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