Lesson 10 Types of Chemical Reactions

Q1. The scale used to indicate acidity or basicity is:

pH scale Volt scale Decibel Ohm

Q2. The normal pH of human blood is approximately:

7.4 5.5 9.5 2

Q3. What is the mathematical definition of pH?

−log[H⁺] log[H⁺] 1/[H⁺] only [H⁺]²

Q4. What is the pOH of a solution with pH 4.5 at 25°C?

9.5 4.5 14.5 10

Q5. What is rate of a chemical reaction?

Change in amount/concentration of reactants or products per unit time Colour of the reaction Only volume of solution Only temperature

Q6. What colour does blue litmus generally turn in acid?

Red Blue Green Yellow

Q7. The approximate pH of 0.001 M HCl is:

3 11 7 1

Q8. Zn + 2HCl → ZnCl₂ + H₂ is a:

Displacement reaction Combination reaction Decomposition reaction Double displacement

Q9. Decomposition caused by electricity is called:

Electrolysis Photolysis Thermolysis Alkalisation

Q10. A reaction that releases heat is called:

Exothermic reaction Endothermic reaction Decomposition Reversible reaction