This document contains a 50 question chemistry exam with multiple choice answers. The questions cover a range of chemistry topics including the periodic table, chemical reactions, properties of substances, atomic structure, and industrial processes.

1. AFMC–Past papersCHEMISTRY - UNSOLVED PAPER - 2003

2. SECTION – I (Total Marks :50)Single Correct Answer TypeThere are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate

3. 01ProblemNumber of elements present in 5th period is8183224

4. Problem02Which of the following does not exist?PbCl4PbBr4Pbl4PbF4

5. Problem03Process of heating in air to remove sulphur iscalcinationroastingsmelting none of these

6. Problem04Treatment of rubber with sulphur isannealing vulcanisationquenching none of these

7. Problem05Argon gas was discovered byRayleigh RamsayLockereyNone of these

8. Problem06Which of the following is used in electroplating?AgClAgNO3sodium argentocyanideNone of these

9. Problem07Element with most electron affinity isF CIBrI

10. Problem08Galvanization includes plating iron withzinc tincopper aluminium

11. Problem09Which of the following is a non-metal?boron aluminiumiridium gallium

12. Problem10Calculate the mass loss in the following. 21H + 31H ->42He + 10n (Given the masses : 2H = 2.014; 3H = 3 .016, He = 4.004, n = 1.008 amu)0.018 amu0.18 amu0.0018 amu1.8 amu

13. Problem11Rate of a 1st order reaction depends upontimeconcentration of reactanttemperature All of these

14. Problem12Which of the following (1 M) conducts more electricity?sulphuric acid Boric acidNitric acid Phosphorous acid

15. Problem13Number of orbitals present in 3rd shell is1 39 18

16. Problem14When ethyl alcohol is heated at 140 degree celcius with sulphuric acid, the product formed isEthyl sulphateDiethyl etherEthane Ethanoylsulphate

17. Problem15Which of the test is done to identify primary, secondary and tertiary alcohol?Hofmann test Victor Meyer's testPerkin's test All of these

18. Problem16Which of the following has highest carbon content?Wrought iron Cast ironStainless steel None of these

19. Problem17Diamond and Emerald are formed ofCarbon - carbon Carbon - silicaSilica - carbon Silica - silica

20. Problem18Aquaregia is a mixture of HN03 and HC1 in the ratio of1 : 3 2 : 33 : 2 3 : 1

21. Problem19S02 reacts with CI in sunlight to formSulphuryl chlorideSulphanyl chlorideSulphur dioxide None of these

22. Problem20Process of converting vapour into liquid is known asCondensationVapourisationFreezing Melting

23. Problem21Copper and tin are constituent ofBronze German silverBrassNone of these

24. Problem22Elements having same number of nucleons and different number of protons areisotonePositronisotope isobar

25. Problem23Proton is likely to have highHydration energy Electron affinityAtomic size Atomic mass

26. Problem24Absolute temperature is the temperature at whichAll molecular motion ceasesVolume ceases to zeroMass becomes zeroNone of these

27. Problem25Alpha particles areProtons Charged helium atomPositron Electron

28. Problem26Which of the following is more reactive ?Red phosphorusWhite phosphorusViolet phosphorusScarlet phosphorus

29. Problem27Gobar gas containsMethane EthanePropane Butane

30. Problem28CO is isoelectronic withNH3N2O2NO2+

31. Problem29Electrolytic refining of aluminium is calledBayer's process Hall's processHoope's process Serpeck's process

32. Problem30If in a container mass and no heat exchange occurs then it constitutes aClosed system Open systemIsolated systemImaginary system

33. Problem31In NaCl, Na+ is called asAcid radical Basic radicalNeutral radicalSalt

34. Problem32pH of pure water isPressure dependentTemperature independentTemperature dependentNone of these

35. Problem33Bohr's theory was modified to give the concept of elliptical orbits byDavisonRutherfordHundSommerfeld

36. Problem34Nylon is apolyamide polyesterpolysaccharide None of these

37. Problem35Which of the following is not a natural polymer?Cellulose ProteinPVC Nucleic acid

38. Problem36Formula of ferric sulphate isFeSO4Fe(SO4)2FeSO4Fe2(SO4)3

39. Problem37Ail element has half-life 1600 years. The mass left after 6400 years will be1/16 1/121/4 1/32

40. Problem38Isotopes have samemass number atomic numbersame nucleons none of these

41. Problem39Silvering of mirror is done byAgNO3Ag2OFe2O3A12O3

42. Problem40Which has highest concentration of N?ureacalcium ammonium nitrateammonium sulphatenitrolim

43. Problem41Hydrogen burns in air with alight bluish flameyellow flamegreen flame none of these

44. Problem42When CuSO4 is hydrated, then it becomesacidic basicneutral amphoteric

45. Problem43The structure of H2O2 isplanar non-planarlinear three dimensional

46. Problem44Which can be used for carrying out nuclear reaction?uranium – 238neptunium - 239thorium - 232 plutonium - 239

47. Problem45Avogadro's number is the number of molecules present in1 g of molecule1 g atom of moleculegram molecular mass1 litre of molecule

48. Problem46If we want to study relative arrangement of atoms in a molecule we studyempirical formulamolecular formulastructural formulaNone of these

49. Problem47The froth-floatation process is based uponthe difference in the specific gravity of ore and gangue particlesthe magnetic properties of gangue and orepreferential wetting of gangue particles b>oilpreferential wetting of ore particles by oil

50. Problem48Diffusion of solvent through a semi permeable membrane is calledDiffusionosmosisactive absorptionplasmolysis

51. Problem49In electro refining of copper some gold is deposited ascathode mud anode mudcathodeelectrode

52. Problem50Precipitate of group IV captions takes place when H2S ishighly ionized less ionizednot ionized none of these

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