Basic Concepts of Chemistry – Multiple Choice Questions (MCQs)

1. 25. Law of Multiple Proportions was proposed by:

   • A. John Dalton
   • B. Joseph Proust
   • C. Antoine Lavoisier
   • D. Gay-Lussac

2. 26. Which of the following is a characteristic of a suspension?

   • A. Particles settle down on standing
   • B. Particles pass through filter paper
   • C. It is transparent
   • D. It is stable

3. 27. What is the percentage composition of carbon in methane (CH4)?

   • A. 75%
   • B. 25%
   • C. 12%
   • D. 88%

4. 28. The SI unit of pressure is:

   • A. Pascal
   • B. Atmosphere
   • C. Bar
   • D. Torr

5. 29. The number of moles of solute in one liter of solution is called:

   • A. Molarity
   • B. Molality
   • C. Normality
   • D. Mole fraction

6. 30. The number of moles of solute per kilogram of solvent is called:

   • A. Molality
   • B. Molarity
   • C. Normality
   • D. Mole fraction

7. 31. How many atoms are present in 4.9 g of H2SO4?

   • A. 3.011 x 10^23
   • B. 6.022 x 10^23
   • C. 1.505 x 10^23
   • D. 4.9 x 10^23

8. 32. The concept of 'atoms are indivisible' was given by:

   • A. John Dalton
   • B. J.J. Thomson
   • C. Ernest Rutherford
   • D. Niels Bohr

9. 33. Which of the following is a mixture?

   • A. Water
   • B. Sodium chloride
   • C. Air
   • D. Ammonia

10. 34. The S.I. unit of density is:

    • A. kg/m^3
    • B. g/cm^3
    • C. kg/L
    • D. g/mL

11. 35. What is the relationship between atomic mass unit (amu) and gram?

    • A. 1 amu = 1/NA g
    • B. 1 amu = NA g
    • C. 1 amu = 1 g
    • D. 1 amu = 10 g

12. 36. The Law of Reciprocal Proportions was given by:

    • A. Richter
    • B. Dalton
    • C. Proust
    • D. Lavoisier