Chemistry – Multiple Choice Questions (MCQs)

1. 25. What is pH?

   • A. A measure of the acidity or basicity of a solution
   • B. A measure of the temperature of a solution
   • C. A measure of the density of a solution
   • D. A measure of the volume of a solution

2. 26. What is a neutral solution in terms of pH?

   • A. pH less than 7
   • B. pH greater than 7
   • C. pH equal to 7
   • D. pH equal to 0

3. 27. What is a salt?

   • A. A substance formed by the reaction of an acid and a base
   • B. A pure element
   • C. A mixture of acids and bases
   • D. A substance with a pH of 0

4. 28. What is neutralization?

   • A. The reaction of two elements
   • B. The reaction of an acid with a base to form salt and water
   • C. The evaporation of a solvent
   • D. The condensation of a gas

5. 29. What is solubility?

   • A. The ability of a substance to react with another substance
   • B. The ability of a substance to dissolve in a solvent
   • C. The melting point of a substance
   • D. The boiling point of a substance

6. 30. What is a solution?

   • A. A pure substance
   • B. A heterogeneous mixture
   • C. A homogeneous mixture of two or more substances
   • D. A compound with a fixed composition

7. 31. What is a solute?

   • A. The substance in a solution that is present in a smaller amount and dissolves
   • B. The substance in a solution that is present in a larger amount
   • C. The solvent
   • D. The container holding the solution

8. 32. What is a solvent?

   • A. The substance in a solution that dissolves the solute and is present in a larger amount
   • B. The substance being dissolved
   • C. The container holding the solution
   • D. A substance that does not participate in dissolution

9. 33. What is concentration of a solution?

   • A. The amount of solute present in a given amount of solvent or solution
   • B. The color of the solution
   • C. The temperature of the solution
   • D. The pressure of the solution

10. 34. What is molarity?

    • A. Moles of solute per liter of solution
    • B. Mass of solute per liter of solution
    • C. Moles of solute per kilogram of solvent
    • D. Mass of solute per kilogram of solvent

11. 35. What is molality?

    • A. Moles of solute per liter of solution
    • B. Mass of solute per liter of solution
    • C. Moles of solute per kilogram of solvent
    • D. Mass of solute per kilogram of solvent

12. 36. What is a catalyst?

    • A. A substance that participates in a reaction and is consumed
    • B. A substance that speeds up a reaction without being consumed
    • C. A substance that slows down a reaction
    • D. A substance that does not affect the rate of a reaction