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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. This is because A. O2 and Xe have comparable ionisation energies B. O2 and Xe have comparable sizes C. O2 and Xe have comparable electronegativities D. both O2 and Xe are gases 2. Its electonic configuration will be A. 1s22s22p63s23p3 B. 1s22s22p3 C. 1s22s22p63s23p2 D. 1s22s22p4 3. 2 dm3 of CO2 gas at STP. The mass of KOH required to completely neutralise the gas is A. 42 g B. 56 g C. 20 g D. 28 g 4. The wave number of the spectral line in the emission spectrum of hydrogen will be equal to times the Rydberg's constant if the electron jumps from A. n = 3 to n = 1 B. n = 9 t0 n = 1 C. n = 10 t0 n = 1 D. n = 2 t0 n = 1 5. Denatured alcohol is A. Rectified spirit B. Undistilled ethanol C. Rectified spirit + methanol + naphtha D. Ethanol + methanol 6. 1 N aci The percentage of nitrogen in the food is A. 8.4 B. 16.8 C. 0.84 D. 1.68 7. It's normality is A. 2 N B. 0.3 N C. 9 N D. 1 N 8. The product is treated with N&2CO3 solution. The missing reagent in the above reaction is A. Phenol B. Methanol C. NaOH D. Ethanol 9. The geometry of electron pairs around I in IF5 is A. Trigonal bipyramidal B. Octahedral C. Square pyramidal D. Pentagonal planar 10. HCl A. Mg B. Zn C. Ag D. Sn 11. The time required for 100% completion of a zero order reaction is A. 2k/a B. ak C. a/k D. a/2k 12. Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of A. S and Cl B. S C. N and S D. N 13. Which one of the following conformations of cyclohexane is the least stable? A. Half-chair B. Twisted-boat C. Boat D. Chair 14. The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is A. 6 g B. 3 g C. 1 g D. 18 g 15. An alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will be A. a tertiary amine B. a primary amine C. a secondary amine- D. All of these 16. Which of the following is an intensive property? A. temperature B. surface tension C. viscosity D. All of these 17. How many molecules are present in one gram of water? A. 3.34 x 1022 B. 3.01 x 1023 C. 6.02 x 1023 D. 1.67 x 1022 18. 1 M HCl is mixed with 200 cm3 of 0.2 M NaoH is A. 2.292 kJ B. 1.292 kJ C. 0.292 kJ D. 22.9 kJ 19. 3 kJ/mol at its boiling point of 80°C. The entropy change in the transition of vapour to liquid at its boiling point is [in J mol–1 K–1] A. –342 B. +100 C. –100 D. +342 20. Of the following which one is classified as polyester polymer? A. Melamine B. Terylene C. Backelite D. Nylon-66 21. Which cycloalkane has the lowest heat of combustion per CH2 group? A. cyclopropane B. cyclopontane C. cyclohexane D. cyclobutanc 22. The correct decreasing order of dipole moment in CH3CI, CH3Br and CH3F is A. CH3F > CH3Br > CH3CI B. CH3CI> CH3Br > CH3F C. CH3F > CH3CI > CH3Br D. CH3CI> CH3F > CH3Br 23. The sp3d2 hybridization of central atom of a molecule would lead to A. Trigonal bipyramidal geometry B. Octahedral geometry C. Tetrahedral geometry D. square planar geometry 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. The number of unidentate ligands in the complex ion is called A. primary valency B. Coordination number C. EAN D. oxidation number 26. The correct order in which the first ionisation potential increases is A. Na, K, Be B. K, Be, Na C. K, Na, Be D. Be, Na, K 27. During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into A. NaNO2 B. NaNC C. NaCN D. NaNH2 28. In which of the following complex ion, the central metal ion is in a state of sp3d2 hybridisation? A. [CoF6]3- B. [Fe(CN)6]3- C. [Co(NH3)6]3+ D. [Cr (NH3)6]3+ 29. 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 30. M. Therefore the number of unpaired electrons present in it is A. 4 B. 2 C. 3 D. 1 31. Which of the following has the maximum number of unpaired 'd' electrons? A. Zn2+ B. Ni3+ C. Fe2+ D. Cu+ 32. The reagent used in Clemmenson's reduction is A. Zn-Hg / con. HCl B. aq. K0H C. Con H2SO4 D. al KOH 33. 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 34. One mole of oxygen at 273 k and one mole of sulphur dioxide at 546 k are taken in two separate containers, then, A. kinetic energy of both are equal. B. kinetic energy of O2 < kinetic energy of SO2. C. kinetic energy of O2 > kinetic energy of SO2 . D. None of these 35. Which one of the following has maximum number of atoms of oxygen? A. 2 g of water B. 2 g of carbon monoxide. C. 2 g of sulphur dioxide D. 2 g of carbon dioxide 36. The calculated bond order of super oxide ion ( ) is A. 1.5 B. 1 C. 2.5 D. 2 37. Methyl bromide is converted into ethane by heating it in ether medium with A. Zn B. Na C. Cu D. Al 38. Which of the following gives an aldehyde on dry distillation? A. Calcium benzoate B. Calcium acetate C. Calcium formate + calcium acetate D. Calcium acetate + calcium benzoate 39. An element with atomic number 21 is a A. transition element B. halogen C. alkali metal D. representative element 40. 44 g is treated with sodium carbonate solution to precipitate all the calcium ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is [Atomic mass of Ca = 40] A. 25 B. 75 C. 31.5 D. 40.2 41. Which of the following pairs of metals is purified by van Arkel method? A. Ga and In B. Ni and Fe C. Ag and Au D. Zr and Ti 42. For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order? A. Co > Mn > Fe > Cr B. Fe > Mn > Co > Cr C. Cr > Mn > Co > Fe D. Mn > Fe > Cr > Co 43. Cooking is fast in a pressure cooker, because A. food particles are effectively smashe B. water boils at higher temperature inside the pressure cooker. C. food is cooked at constant volume. D. loss of heat due to radiation is minimum. 44. Formation of coloured solution is possible when metal ion in the compound contains A. lone pair of electrons B. paired electrons C. unpaired electrons D. none of these 45. This is due to A. +R effect of -NH2 group B. hyperconjugation effect C. -R effect of -NH2 group D. -I effect of -NH2 group 46. Name the type of the structure of silicate in which one oxygen atom of [SiO4]4– is shared? A. Sheet silicate B. Three dimensional C. Linear chain silicate D. Pyrosilicate 47. Malleability and ductility of` metals can be accounted due to A. the crystalline structure in metal B. the capacity of` layers of metal ions to slide over the other C. the interaction of` electrons with metal ions in the lattice D. the presence of electrostatic force 48. 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 49. Ethyl benzene CANNOT be prepared by A. Clemmensen reduction B. Friedel-Crafts reaction C. Wurtz reaction D. Wurtz-Fittig reaction 50. Which one of the following is a covalent crystal? A. Quartz B. Rock salt C. Dry ice D. Ice | |