PHYSICAL CHEMISTRY MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 29, 2025

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1. : Which statement is true?



2. : The study of numerous laws and principles governing chemical and physical changes is called _____ .



3. : Which is not an element?



4. : Which is not a mixture?



5. : Which statement is false?



6. : A mixture of sand and ammonium chloride can be separated by



7. : Calcium sulfate containing sodium sulfate as impurity is separated by which of the following?



8. : Which is not a compound?



9. : Which is false with respect to SI units?



10. : Which process results in a chemical change?



11. : What is the relationship between picometer (pm) and nanometer (nm)?



12. : The atmospheric pressure of one torr is equal to which of the following?



13. : Which is true?



14. : According to ______, the percentage of hydrogen in water and hydrogen peroxide is 11.1 and 5.9% respectively.



15. : The balancing of a chemical equation is based on which law?



16. : Which liquid mixture cannot be separated by simple distillation?



17. : Which is the most abundant element in Earth’s crust?



18. : The isotopes of chlorine with mass number 35 and 37 exist in which ratio?



19. : What is the value of Avogadro’s number?



20. : What is the mass of one mole of an electron?



21. : Which has maximum mass?



22. : What is the volume occupied by 1.4 g of N₂ at STP?



23. : Total number of atoms present in 64 g of SO₂ is



24. : What is the approximate mass of one a.m.u?



25. : Which substance is helpful and used as CO₂ absorber in combustion analysis?



26. : The weights of two elements which combine with one another are in the ratio of their ____ .



27. : The equivalent mass of KMnO₄ in acidic medium (K = 39, Mn = 55, O = 16)



28. : Which is the atomic mass of an element?



29. : Which represents 1 gram molecule of a substance?



30. : What is the number of moles of SO₂ in 6.4 gram?



31. : What is the empirical formula of oxalic acid?



32. : Which one of the following contains 44 maximum numbers of molecules?



33. : What is the mass of the electron?



34. : Which pairs of compounds illustrate law of multiple proportions?



35. : Which property is forever in whole numbers?



36. : Isotopes differ in which of the following?



37. : The technique helpful and used to separate insoluble particles from liquid is:



38. : Actual yield of a chemical reaction is forever less than the theoretical yield because of



39. : The process controlled by distribution law is



40. : Number of peaks in mass spectrum shows



41. : Which substance is helpful and used as decolorizing agent?



42. : Which is not helpful and used as drying agent in desiccators?



43. : The separation of miscible liquids by heating due to difference in boiling points is called __ .



44. : Which is not locating reagent?



45. : Which is the safe and most reliable method of drying crystals?



46. : Which is insoluble in water but soluble in KI solution?



47. : Mixture of NaCl and ammonium chloride is separated by which of the following?



48. : Equal volumes of different gases at any definite temperature and pressure have _____ molecules.



49. : Which is the most suitable locating reagent for amino acids on paper chromatography?



50. : The solid _____ is left over the filter paper.



51. : Which is not macromolecule?



52. : The ideal standard of atomic mass is



53. : Height of a peak in mass spectrum shows ______.



54. : What is the approximate diameter of the atom?



55. : Which elements give single peak in mass spectrum?



56. : Which is the volume occupied by 28 g of N₂ at STP?



57. : Solvent extraction is based on which of the following?



58. : The rate at which solute moves in paper chromatography depends on which of the following?



59. : Which is a separation technique?



60. : Which is most convenient way of filtration?



61. : A sample in the ionization chamber of mass spectrometer is ionized by



62. : Direct conversion of solids into vapors is called ______ .



63. : The rate of filtration can be increased by which of the following?



 

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