
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

Kerala engineering entrance a

14 pages, 49 questions, 18 questions with responses, 18 total responses,

Yogesh
Indian Institute of Technology (IIT) Bombay, Mumbai
Chemical Engineering

+Fave Message

Profile Timeline Uploads

Home > yogesh - main folder >

Formatting page ...

Kerala Engineering Entrance 2005 Chemistry 1. Identify the product in the following sequence (1)diazotization ? 3,4,5-tribromoaniline (2)H 3 PO2 A. 3,4,5-tribromobenzene B. 1,2,3-tribromobenzene C. 2,4,6-tribromobenzene D. 3,4,5-tribromonitrobenzene E. 3,4,5-tribromophenol Ans: B 2. Among the amines a) C 6 H 5 NH 2 basicity is A. B. C. D. E. b) CH 3 NH 2 c) (CH 3 )2 NH d) (CH 3 )3 N the order of a<b<d<c d<c<b<a a>b>c>d b<c<d<a d < c < b< a Ans: A 3. The number average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and 40,000. The poly dispersity index of the polymer is A. B. C. D. E. <1 >1 1 0 1 Ans: B 4. In biological systems, the RNA molecules direct the synthesis of specific proteins, which are characteristic of each kind of organism. This process is known as A. B. C. D. E. Transcription Mutation Replication Translation Flocculation Ans: D 5. Pick up the correct statement A. CO which is major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog B. Classical smog has an oxidizing character while the photochemical smog is reducing in character C. Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours D. During formation of smog the level of ozone in the atmosphere goes down E. Classical smog is good for health but not photochemical smog Ans: C 6. In Antarctica ozone depletion is due to the formation of following compound A. B. C. D. E. Acrolein Peroxy acetyl nitrate SO2 and SO3 Chlorine nitrate Formaldehyde Ans: D 7. 100 g CaCO3 is treated with 1 litre of 1 N HCl. What would be the weight of CO2 liberated after the completion of the reaction? A. B. C. D. E. 5.5g 11 g 22 g 33 g 44 g Ans: C 8. The relationship between the energy E1 of the radiation with wavelength 8000 A and the energy E2 of the radiation with a wavelength 16000 A is A. E 1 = 6E 2 B. E 1 = 2E 2 C. E 1 = 4E 2 D. E 1 = 1 E 2 2 E. E 1 = E 2 Ans: B 9. If the molecule of HCl were totally polar, the expected value of dipole moment is 6.12D (debye), but the experimental value of dipole moment was 1.03D. Calculate the percentage ionic character A. B. C. D. E. 17 83 50 Zero 90 Ans: A 10. Which one of the following molecules has the smallest bond angle? A. B. C. D. E. NH3 PH3 H2O H2Se H2S Ans: D 11. If the absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will A. B. C. D. E. Remain unchanged Be doubled Increase fourfold Be halved Be reduced to one-fourth Ans: C 12. To what temperature must a neon gas sample be heated to double its pressure, if the initial volume of gas at 75oC is decreased by 15.0%? A. B. C. D. E. 319oC 592oC 128oC 60oC 90oC Ans: A 13. When electric current is passed through an ionic hydride in molten state A. B. C. D. E. Hydrogen is liberated at anode Hydrogen is liberated at cathode No change takes place Hydride ion migrates towards cathode Hydride ion remains in solution Ans: A 14. The order of first ionization energies of the element Li, Be, B, Na is A. B. C. D. E. Li > Be > B > Na Be > B > Li > Na Na > Li > B > Be Be > Li > B > Na B > Be > Li > Na Ans: B 15. The froth-floatation process is based upon A. B. C. D. E. The difference in the specific gravity of ore and gangue particles The magnetic properties of gangue and ore Preferential wetting of gangue particles by oil Preferential wetting of ore particles by oil The solubility of ore particles in suitable reagent Ans: D 16. Which one of the following statements is true for all the alkali metals? A. B. C. D. E. Their nitrates decompose on heating to give NO2 and O2 Their carbonates decompose on heating to give CO2 and the metal oxide They react with oxygen to give mainly the oxide M2O They react with halogens to give the halides MX They react with nitrogen to give nitrides Ans: D 17. The order of acidic strength of boron trihalides is A. BF3 < BCl 3 < BBr3 < BI 3 B. C. D. E. BI 3 < BBr3 < BCl 3 < BF3 BCl 3 < BBr3 < BI 3 < BF3 BBr3 < BCl 3 < BF3 < BI 3 BF3 < BI 3 < BCl 3 < BBr3 Ans: A 18. The carbide which reacts with water to form propyne is A. B. C. D. E. CaC2 SiC Mg2C3 Al4C3 Be2C Ans: C 19. Effective magnetic moment of Sc3+ ion is A. B. C. D. E. 1.73 0 5.92 2.83 3.87 Ans: B 20. Potassium permanganate acts as an oxidant in alkaline and acidic media. The final products formed from KMnO 4 in the two conditions are respectively A. B. C. D. E. MnO 2 and Mn 3+ Mn 3+ and Mn 2+ Mn 2+ and Mn 3+ MnO 2 and Mn 2+ Mn +2 and MnO 2 Ans: D 21. Calculate the mass loss in the following 2 1 1 H + 3 H 4 He + 0 n 1 2 (Given the masses: 2 H = 2.014; 3 H = 3.016; He = 4.004; n = 1.008 amu ) A. 0.018 amu B. 0.18 amu C. 0.0018 amu D.1.8 amu E. 18 amu Ans: A 22. Match list I and II and select the correct answer using the code given below the lists List I: List II: Nuclear reactor components Substance used 1. Moderator a. Uranium 2. Control rods b. Graphite 3. Fuel rods c. Boron 4. Coolant d. Lead e. Sodium Codes: A. 1-b, 2-a, 3-c, 4-e B. 1-b, 2-c, 3-a, 4-e C. 1-c, 2-b, 3-a, 4-e D. 1-c, 2-d, 3-a, 4-b E. 1-d, 2-c, 3-b, 4-a Ans: B 23. H and S for a reaction are +30.558 kJ mol-1 and 0.066 kJ K-1 mol-1 at 1 atm pressure. The temperature at which free energy change is equal to zero and the nature of the reaction below this temperature are A. B. C. D. E. 483 K, spontaneous 443 K, non-spontaneous 443 K, spontaneous 463 K, non-spontaneous 463 K, spontaneous Ans: D 24. What would be the heat released when an aqueous solution containing 0.5 mole of HNO3 is mixed with 0.3 mole of OH (Enthalpy of neutralization is 57.1 kJ)? A. B. C. D. E. 28.5 kJ 17.1 kJ 45.7 kJ 1.7 kJ 2.85 kJ Ans: B 25. A(g ) + 3B(g ) 4C(g ) . Initial concentration of A is equal to that of B. The equilibrium concentrations of A and C are equal. Kc= 0.08 0.8 8 80 1 E. 8 A. B. C. D. Ans: C 26. Two moles of PCl5 is heated in a closed vessel of 2 litre capacity. When the equilibrium is attained, 40% of it has been found to be dissociated. What is the Kc in mol/dm3? A. B. C. D. E. 0.532 0.266 0.133 0.174 0.25 Ans: B 27. Dry air is passed through a solution containing 10g of a solute in 90g of water and then through pure water. The loss in weight of solution is 2.5g and that of pure solvent is 0.05g. Calculate the molecular weight of the solute? A. B. C. D. E. 50 180 102 25 51 Ans: C 28. The van t Hoff factor for BaCl2 at 0.01M concentration is 1.98. The percentage of dissociation of BaCl2 at this concentration is A. B. C. D. E. 49 69 89 98 100 Ans: A 29. The standard electrode potentials of Ag+/ Ag is +0.80 V and Cu+/Cu is +0.34 V. These electrodes are connected through a salt bridge and if A. B. C. D. E. Copper electrode acts as a cathode then Eo cell is +0.46 V Silver electrode acts as anode then Eo cell is 0.34 V Copper electrode acts as anode the Eo cell is +0.46 V Silver electrode acts as a cathode then Eo cell is 0.34 V Silver electrode acts as anode then Eo cell is +1.14 V Ans: C 30. In alkaline medium ClO2 oxidises H2O2 to O2 and itself gets reduced to Cl-. How many moles of H2O2 are oxidized by 1 mole of ClO2? A. B. C. D. E. 1.0 1.5 2.5 3.5 5.0 Ans: C 31. For the reaction 2N 2 O 5 (g ) 4NO 2 (g ) + O 2 (g ) if the concentration of NO2 increases by 5.2 10 3 M in 100 seconds then the rate of the reaction is A. B. C. D. E. 1.3 10 5 Ms 1 5 10 4 Ms 1 7.6 10 4 Ms 1 2 10 3 Ms 1 2.5 10 5 Ms 1 Ans: A 32. A first order reaction is 10% complete in 20 min. The time taken for 19% completion is A. B. C. D. E. 30 min. 40 min. 50 min. 38 min. 45 min. Ans: B 33. Lyophilic sols are more stable than lyophobic sols because the particles A. B. C. D. E. Are positively charged Are negatively charged Are solvated Repel each other Are heavy Ans: C 34. Potassium stearate is obtained by the saponification of an oil or fat. It has the formula CH 3 (CH 2 )16 COO K + . The molecule has a lyophobic end CH 3 and a lyophilic end COO K + . Potassium stearate is an example for A. B. C. D. E. Lyophobic colloid Lyophilic colloid Multimolecular colloid Macromolecular colloid Associated colloid or micelle Ans: E 35. (a) K 4 [Fe(CN )6 ] (b) K 3 [Cr (CN )6 ] (c) K 3 [Co(CN )6 ] (d) K 2 [Ni(CN )4 ] . Select the complexes which are diamagnetic. A. B. C. D. E. (a), (b) and (c) (b), (c) and (d) (a), (c) and (d) (a), (b) and (d) (b) and (d) Ans: C 36. Which is not true of the coordination compound [Co(en )2 Cl 2 ]Cl ? A. B. C. D. E. Exhibits geometrical isomerism Exhibits optical isomerism Exhibits ionization isomerism Is an octahedral complex Is a cationic complex Ans: C 37. The IUPAC name of the given compound is HOOC CH 2 CH CH 2 CH 2 COOH A. B. C. D. E. COOH 2 (carboxylmethyl)-pentane-1, 5-dioic acid 3-carboxyhexane-1, 6-dioic acid Butane-1, 2, 4-tricarboxylic acid 4-carboxyhexane-1, 6-dioic acid 1, 2-dicarboxy-pentanoic acid Ans: C 38. How much of sulphur is present in an organic compound, if the 0.53 g of the compound gave 1.158 g of BaSO4 on analysis? A. B. C. D. E. 10% 15% 20% 25% 30% Ans: E 39. An alkene having the molecular formula C9H18 on ozonolysis gives 2,2-dimethyl propanal and 2-butanone. The alkene is A. B. C. D. E. 2, 2, 4-trimethyl-3-hexene 2, 2, 6-trimethyl-3-hexane 2, 3, 4-trimethyl-2-hexene 2, 2, 4-trimethyl-2-hexene 2, 2-dimethyl-3-heptene Ans: A 40. Observe the following reactions and predict the nature of A and B A. A and B both are B. A and B both are C. A is and B is D. A is and B is E. A is and B is Ans: C 41. Nitration of aniline in strongly acidic medium, result in the formation of m-nitroaniline also. This is because A. B. C. D. E. Amino group is meta orienting during electrophilic substitution reaction Nitro group goes always to the meta position irrespective of the substituents Nitration of aniline is a nucleophilic substitution reaction in strongly acidic medium In strongly acidic conditions aniline is present as anilinium ion Strong acids generate nitrite anion which can attack only the meta position Ans: D 42. How many sigma and pi bonds are present in toluene? A. B. C. D. E. 3 + 8 3 + 6 3 + 15 6 + 3 6 + 6 Ans: C 43. Which of the following Fischer s projection formula is identical to D-glyceraldehyde? A. B. C. D. E. Ans: C 44. The name of the compound is A. B. C. D. E. (2Z, 4Z) 2,4-hexadiene (2Z, 4E) 2, 4-hexadiene (2E, 4Z) 2,4-hexadiene (4E, 4Z) 2,4-hexadiene (2E, 4E) 2,4-hexadiene Ans: E 45. When 32.25 g of ethylchloride is subjected to dehydrohalogenation reaction the yield of the alkene formed is 50%. The mass of the product formed is (atomic mass of chlorine is 35.5) A. 14 g B. C. D. E. 28 g 64.5 g 56 g 7g Ans: E 46. Chlorination of toluene in presence of light and heat followed by treatment with aqueous NaOH gives A. B. C. D. E. o-cresol p-cresol Mixture of o-cresol and p-cresol Benzoic acid 1, 3, 5 - trihydroxy toluene Ans: D 47. CH 3 CHO + HCN A . Compound A on hydrolysis gives A. CH 3 CH 2 COOH B. CH 3 CH 2 CH 2 NH 2 C. CH 3 CO COOH D. CH 3 CO CH = NOH E. CH 3 CH COOH OH Ans: E 48. Which of the following does not undergo Cannizzaro s reaction? A. B. C. D. E. Benzaldehyde 2-methylpropanal p-methoxybenzaldehyde 2, 2-dimethylpropanal Formaldehyde Ans: B

Formatting page ...

Top Contributors
to this ResPaper
(answers/comments)

Yogesh
(17)

Formatting page ...

Additional Info : m4C
Tags : t4C,

yogesh chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: