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A fresh set of 50 random questions is generated every time you open this page and every time you refresh it. The form will be autosubmitted at end of 60 minutes after page open/refresh. For each of the following multiple choice questions, choose the most appropriate answer : 1. 65 coulombs of electric current is passed through fused anhydrous MgCl2. The magnesium metal thus obtained is completely converted into a Grignard reagent. The number of moles of Grignard reagent obtained is A. 5 ´ 10–4 B. 1 ´ 10–4 C. 1 ´ 10–5 D. 5 ´ 10–5 2. 5 gm of NaCl of 90% purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1 M acetic acid required to neutralise NaOH obtained above is A. 1000 cm3 B. 200 cm3 C. 100 cm3 D. 2000 cm3 3. Which of the following can be measured by the Ostwald-Walker dynamic method A. Relative lowering of vapour pressure B. Lowering of vapour pressure C. Vapour pressure of the solvent D. All of these 4. Which one of the following is present as an active ingredient in bleaching powder for bleaching action? A. CaOCl2 B. Ca(OCl)2 C. CaO2Cl D. CaCl2 5. The correct order of ionisation energy of C, N, O, F is A. C < N < O < F B. F < O < N < C C. F < N < C < O D. C < O < N < F 6. Thermodynamic standard conditions of temperature and pressure are A. 298 k and 1 atm B. 273 k and 101.3 k Pa C. 0°C and 1 atm D. 0°C and 101.3 k Pa 7. Its de Broglie wavelength is 6.62 ´ 10-35m. Hence x is (h = 6.62 ´ 10-34Js) A. 0.2 kg B. 0.15 kg C. 0.25 kg D. 0.1 kg 8. How many chiral carbon atoms are present in 2, 3, 4 - trichloropentane? A. 3 B. 1 C. 2 D. 4 9. Which one of the following is paramagnetic? A. NO B. CO C. O3 D. N2 10. Which of the following forms a colour less solution in aqueous medium? A. Cr 3+ B. Ti 3+ C. V 3+ D. Sc 3+ 11. Identify the ore not containing iron A. siderite B. chalcopyrites C. limonite D. carnallite 12. Which cycloalkane has the lowest heat of combustion per CH2 group? A. cyclopropane B. cyclopontane C. cyclohexane D. cyclobutanc 13. If the energies of the two photons are in the ratio of 3: 2, their wavelengths will be in the ratio of A. 2: 3 B. 3: 2 C. 9: 4 D. 1: 2 14. In which one of the given formulae of xenon compounds there are five a-bonds and three p-bonds in it? A. XeF3O2 B. XeF2O3 C. XeFO D. XeF2O2 15. At pH = 4 glycine exists as A. H2N - CH2 - COO- B. H3 - CH2 - COO- C. H3- CH2 - COO- D. H2N - CH2 - COOH 16. In which of the following, NH3 is not used? A. Group reagent for the analysis of IIIgroup basic radical. B. Nessler's reagent C. T0llen's reagent D. Group reagent for the analysis of IV group basic radical. 17. Carbon can reduce ferric oxide to iron at a temperature above 983 K because A. iron has a higher affinity towards oxygen than carbon. B. carbon monoxide formed is thermodynamically less stable than ferric oxide. C. carbon has a higher affinity towards oxidation than iron. D. free energy change for the formation of carbon dioxide is less negative than that for ferric oxide. 18. 2 V, +0.5 V and –3.0 V respectively. The reducing power of these metals will be A. Z > X > Y B. X > Y > Z C. Y > Z > X D. Y > X > Z 19. The product formed when hydroxylamine condenses with a carbonyl compound is called A. hydrazide B. hydrazine C. oxime D. hydrazone 20. Which of the following species does not exert a resonance effect? A. C6H5NH2 B. C6H5NH3 C. C6H5Cl D. C6H5OH 21. During the adsorption of krypton on activated charcoal at low temperature, A. DH > 0 and DS > 0 B. DH < 0 and DS > 0 C. DH < 0 and DS < 0 D. DH > 0 and DS < 0 22. In aqueous solution glucose remains as A. Only in open chain form B. Only in pyranoze form C. Only in furanose forms D. In all three forms in equilibrium 23. The function of Fe(OH)3 in the contact process is A. to remove arsenic impurity B. to remove moisture C. to detect colloidal impurity D. to remove dust particles 24. Hofmann's bromamide reaction is to convert A. amine to amide B. alcohol to acid C. acid to alcohol D. amide to amine 25. Maximum efficiency of a commercial refrigerator which operates between –10° (inside temperature) and 25°C (outside temperature) is A. 13.3% B. 11.45% C. 20% D. 24.75% 26. Carbon cannot reduce Fe2O3 to Fe at a temperature below 983 K because A. CO is thermodynamically more stable then Fe2O3 B. free energy change for the formation of CO is more negative then that of Fe2O3 C. carbon has higher affinity towards oxygen then iron D. iron has higher affinity towards oxygen then carbon 27. The compound which is not founded during the dry distillation of a mixture of calcium format and calcium acetate is A. Ethanal B. Propanal C. Methanal D. Propanone 28. Argon is used A. in radiotherapy for treatment of cancer B. in high temperature welding C. in filling airships D. to obtain low temperature 29. The catalyst used in the preparation of an alkyl chloride by the action of dry HCI on an alcohol is A. FeCl3 B. Cu C. anhydrous ZnCl2 D. anhydrous AlCl3 30. The one which is NOT an exception is A. N and O B. Na and Mg C. Mg and Al D. Be and B 31. Which of the following elements is present as the impurity to the maximum extent in the pig iron? A. Carbon B. Phosphorus C. Silicon D. Manganese 32. For the reaction H20 (l) Ý H2O(g) at 373 K and one atmospheric pressure A. DH = DE B. DH = TDS C. DH = 0 D. DE = 0 33. Chloroacetic acid is a stronger acid than acetic aci This can be explained using A. +I effect B. - M effect C. - I effect D. + M effect 34. The reagent used in Clemmenson's reduction is A. Zn-Hg / con. HCl B. aq. K0H C. Con H2SO4 D. al KOH 35. The correct order of increasing bond length of C – H, C – O, C – C and C = C is A. C - O < C - H < C - C < C = C B. C - C < C = C < C - O < C - H C. C - H < C = C < C – O < C - C D. C - H < C - O < C – C < C = C 36. 06 mole of KNO3 solid is added to 100 cm3 of water at 298 k. The enthalpy of KNO3aq solution is 35.8 kJmol-1. After the solute is dissolved the temperature of the solution will be A. 304 k B. 298 k C. 293 k D. 301 k 37. Which of the following compounds has the lowest melting point? A. CaCl2 B. CaBr2 C. CaI2 D. CaF2 38. In Tollen's test, aldehydes A. Are oxidised to acids B. Are reduced to alcohol C. Precipitate Ag+ as AgCI D. Neither reduced nor oxidised 39. Reaction of formaldehyde and ammonia gives A. Bakelite B. Urea C. Triethylene Tetramine D. Hexamethylene tetramine 40. Which one of the following statement is no true? A. Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant B. Clean water would have a BOD value of less than 5 ppm C. pH of drinking water should be between 5.5 – 9.5 D. Concentration of DO below 6 ppm is good for the growth of fish 41. During the adsorption of Krypton on activated charcoal at low temperature; A. ?H < 0 and ?S < 0 B. ?H < 0 and ?S > 0 C. ?H > 0 and ?S < 0 D. ?H > 0 and ?S > 0 42. The salt will precipitate when the concentration of B- ions is kept A. between 10-8 M to 10-7 M B. >10-5 M C. between 10-7 M to 10-6 M D. <1O-8 M 43. The IUPAC name of the complex [Co (NH3)4Cl2] Cl is A. tetraammine dichloro cobalt (IV) chloride B. tetraammine dichloro cobalt (III) chloride C. dichloro tetraammine cobalt (III) chloride D. tetraammine dichloro cobalt (II) chloride 44. NO2 is not obtained on heating A. Pb(NO3)2 B. Cu(NO3)2 C. AgNO3 D. KNO3 45. An ionic compound is expected to have tetrahedral structure if lies in the range of A. 0.414 to 0.732 B. 0.225 to 0.414 C. 0.732 to 1 D. 0.155 to 0.225 46. Based on the first law of thermodynamics, which one of the following is correct? A. For an adiabatic process, ?U = -w B. For an isochoric process, q = +w C. For an isochoric process, ?U = -q D. For a cyclic process, q = -w 47. An element with atomic number 21 is a A. transition element B. halogen C. alkali metal D. representative element 48. When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is A. acetophenone B. benzaldehyde C. acetaldehyde D. benzophenone 49. 303 RT J mol–1. The ratio of rate constant to the Arrhenius factor is A. 0.001 B. 0.02 C. 0.1 D. 0.01 50. 80 g of oxygen contains as many atoms as in A. 5 g of hydrogen B. 80 g of hydrogen C. 1 g of hydrogen D. 10 g of hydrogen | |