Go to main content

2 Marks Question

  1. Write the balanced chemical reaction between Aluminum metal and dilute hydrochloric acid. Mention the type of reaction with reason.
  2. The balanced chemical reaction between Aluminum metal and dilute hydrochloric acid is shown below:

    Al + HCl ⟶ AlCl3 + H2
    2Al + 6HCl ⟶ 2AlCl3 + 3H2

    It is displacement reaction because hydrogen is displaced by aluminum.
  3. Write the following word equation into balanced formula equation.
    Nitric acid + calcium hydroxide ⟶ calcium nitrate + water
  4. HNO3 + Ca(OH)2 ⟶ Ca(NO3)2 + H2O
    2HNO3 + Ca(OH)2 ⟶ Ca(NO3)2 + 2H2O
  5. Write the given word equation into formula equation.
    1. Zinc + Sulphuric acid ⟶ Zinc sulphate + Hydrogen
    2. Zn + H2SO4 ⟶ ZnSO4 + H2
    3. Limestone →△\xrightarrow{\triangle} Quicklime + Carbon dioxide
    4. CaCO3 ⟶ CaO + CO2
  7. Two chemical substances A and B when mixed at room temperature react very slowly. Suggest two different ways of increasing the rate of this reaction.
  8. Two different ways of increasing the rate of this reaction are:
    1. By using positive catalyst.
    2. By increasing temperature.
  9. Write a chemical reaction between calcium and sulphuric acid. Mention the type of chemical reaction.
  10. Chemical reaction between calcium and sulphuric acid is:
    Ca + H2SO4 ⟶ CaSO4 + H2
    It is displacement chemical reaction.
  11. The state of chemical reaction increases with the increase of the surface area of reactant. Why?
  12. By increasing surface area, there are more collisions per unit of time. So, the state of the chemical reaction increases if the surface area increases.
  13. Write the example of each catalyst that accelerates and decelerates the rate of chemical reaction along with the balanced chemical reaction.
  14. 2H2O2 →MnO2\xrightarrow{MnO_2} 2H2O + O2
    MnO2 is used as positive catalyst that accelerates the rate of chemical reaction.

    2H2O2 →glycerin\xrightarrow{glycerin} 2H2O + O2
    Glycerin is used as negative catalyst that decelerates the rate of chemical reaction.

  15. What is the difference between catalyst and promoter? Write with example.
  16. The chemical substance that increases or decreases the rate of a chemical reaction is called a catalyst. A promoter is a chemical substance added to a solid catalyst to improve its performance in a chemical reaction.

    For example: In Haber's process 'Fe' is used as catalyst and 'Mo' is used as promoter.

  17. Write a balanced equation of the chemical reaction between calcium chloride and silver nitrate.
  18. A balanced equation of the chemical reaction between calcium chloride and silver nitrate is:
    CaCl2 + AgNO3 ⟶ AgCl + Ca(NO3)2
    CaCl2 + 2AgNO3 ⟶ 2AgCl + Ca(NO3)2
  19. What happens when solution of silver nitrate is added into the solution of sodium chloride. Write a balanced chemical equation of acid-base reaction.
  20. When solution of silver nitrate is added into the solution of sodium chloride, a white precipitate of silver chloride (AgCl) is formed along with sodium nitrate (NaNO3).
    AgNO3 + NaCl ⟶ AgCl + NaNO3
    A balanced chemical equation of acid-base reaction is:
    HCl + NaOH ⟶ NaCl + H2O
  21. Write the balanced chemical equation of the reaction. Which type of chemical reaction is it?
  22. Zn + H2SO4 ⟶ ZnSO4 + H2
    It is single displacement reaction.
  23. Write the balanced chemical equation of the reaction between sodium hydroxide and hydrochloric acid.
  24. The balanced chemical equation of the reaction between sodium hydroxide and hydrochloric acid is:
    NaOH + HCl ⟶ NaCl + H2O
  25. Change the given word equation into a balanced chemical equation. What type of chemical reaction is it? Write the role of MnO2 in this reaction?
  26. Potassium Chlorate →MnO2\xrightarrow{MnO_2} Potassium Chloride + Oxygen
    2KClO3 →MnO2\xrightarrow{MnO_2} 2KCl + 3O2
    It is decomposition reaction.
    The role of MnO2 is to increase the rate of this reaction.
  27. In what condition do sodium chloride and silver nitrate react? Write the balanced chemical equation of that reaction.
  28. In order for them to react, both must be dissolved in water or other solvents capable of dissociating them into their ions.

    The balanced chemical equation of reaction between sodium chloride and silver nitrate is,
    AgNO3 + NaCl ⟶ AgCl + NaNO3

  29. Write the relationship between the rate of chemical reaction and surface area of reaction.
  30. By increasing surface area, there are more collisions per unit of time. So, the rate of chemical reaction increases if surface area increases. That means the rate of the chemical reaction is directly proportional to the surface area of the reaction.
  31. Change the given word equation into balanced chemical equation. What type of reaction is it?
    Hydrogen peroxide ⟶ Water + Oxygen
  32. H2O2 ⟶ H2O + O2
    2H2O2 ⟶ 2H2O + O2

    It is decomposition reaction.

Send Feedback
Next Chapter