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SL - Mechanisms of Chemical Change

25 MCQ from 2025 Question Bank Mechanisms of Chemical Change (all topics)

DP IB SL Chemistry Quiz

 

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1. What is the  of a 0.001 mol dm^−3 aqueous solution of KOH at  given that it ionizes completely?

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2. A solution of 1.0 mol dm^−3 HCl is diluted to 0.1 mol dm^−3. Which statement is correct?

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3. Four features of the HNO molecule are labelled a-d.

8.1-634

Why is one mole of HNO3 able to react with one mole of NaOH?

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4. Which of the three oxides of period 3 below will cause a change in the pH of the solution when they react with water?

I. Na2O
II. SiO2
III. P4O10​

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5. When wine is exposed to air, the ethanol is slowly converted to ethanoic acid. The  of a bottle of wine changes from 6.5 to 4.5. The concentration of [H]^+ is?

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6. A reaction produces carbon dioxide gas and a solution of water with a dissolved salt. What could be the reactants?

 

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7. What are the respective oxidation states of sulfur in the following sulfur-containing species?

SO3^2−,H2SO4,S8,S2O3^2−

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8. Which of the below reactions shows the oxidation of a secondary alcohol?

 

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9. What are the correct products of the reaction of nitric acid and magnesium metal?

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10. Which statements about the electrolysis of molten aluminium oxide are correct?

I. Aluminium ions gain electrons at the cathode
II. Oxide ions lose electrons at the cathode
III. The cathode is the site of reduction in this cell

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11. What happens to nitrogen when nitrate changes to nitrite?

 

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12. Which statement(s) about bond fission is(are) correct?

  • I. Homolytic fissions produce free radicals
  • II.Heterolytic fissions produce highly reactive species with unpaired electrons
  • III.Heterolytic fissions produce ions

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13. Which of the following describe a nucleophile?

I.   Electron-rich species
II.  Have a lone pair of electron
III.  Donates electron to the electron-deficient
IV.  Is electron-deficient species itself

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14. Which statement about electrochemical cells is not correct?

 

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15. Which row, indicated in the table below, contains the correct species that are produced at each electrode during the electrolysis of molten zinc chloride?

  • Negative electrode (cathode) Positive electrode (anode)
    A. Zn(s) Cl2(g)
    B. Zn2+(l) Cl−(l)
    C. Cl−(l) Zn2+(l)
    D. Cl2(g) Zn(s)

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16. Which statement is correct?

 

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17. In order to prepare a solution of 0.1 mol dm^− with the highest , substance  is dissolved in water. Substance  is:

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18. Which of the following statements are correct?

I.    Voltaic cells convert chemical energy into electrical energy
II.  Electrolytic cells convert electrical energy into chemical energy
III. Electrolytic cells require a salt bridge

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19. Which statements are correct about an electrolytic cell?

I. An external power supply is used to drive a non-spontaneous process
II. Oxidation occurs at the positive electrode in the cell
III. The cell could be used to extract a reactive metal from its molten salt

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20. The diagram below shows a Daniel cell. Zinc is more reactive than copper. When the cell is operating, which statement about the ions in the cell is correct?

CH0121

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21. Which statement about a strong acid and its conjugate base is correct?

 

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22. Which of the following is correct?

 

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23. An example of a strong acid solution is nitric acid. Which statement is correct for this solution?

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24. A molecule of HBr reacts with water to produce the charged molecule X. What is the Lewis structure of molecule X?

  • A. 8.1-635a
  • B. 8.1-635b
  • C. 8.1-635c
  • D. 8.1-635d

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25. The correct sequence in decreasing order of pH for equimolar solutions is:

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