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HL - Mechanisms of Chemical Change

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

DP IB HL Chemistry Quiz

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1. What is the  of a 0.001 mol dm^−3 aqueous solution of KOH at 298Kgiven that it ionizes completely?

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2. Which statement about bonding is correct?

 

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3. Four features of the HNO3 molecule are labelled a-d.

8.1-634

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

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4. Which statement about the equivalence point of acid-base titrations is incorrect?

 

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5. Which combination of acid and base will typically have the lowest pH at the equivalence point in a titration?

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6. Which combination of acid and base should be reacted to obtain a basic salt?
                Acid                      Base
A.        Strong                 Strong
B.        Strong                 Weak
C.        Weak                 Strong
D.        Weak                 Weak

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

 

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8. 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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9. Which of the following expressions for Kw is correct?

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10. 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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11.  of an aqueous solution of  with 1.0 is mixed with 990 cm^3 of water. The  of the formed solution is:

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

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

 

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14. Which of the following is correct?

 

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15. Which expression represents Ka for CH3COOH?

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16. Given the following indicators and their behaviours, what will be the correct colours of a solution of 1.0 M KOH tested with each indicator?

Indicator pH range Colour change (Acid- alkali)
Methyl orange 3.1- 4.4 Red – Orange
Bromocresol green 3.8 - 5.4 Yellow - Blue
Phenolphthalein 8.3 - 10.0 Colourless - Pink
  • Methyl orange Bromocresol green Phenolphthalein
    A. Red Yellow Colourless
    B. Orange Blue Pink
    C. Orange Blue Colourless
    D. Orange Yellow Pink

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17. The following flow chart shows how different functional groups may be interconverted using chemical reactions.

20.2-477

Which reactions could be performed using the reagents and reaction conditions given in the table?

  • HCl Cl2 and UV light NaOH
    A. Reaction 1 Reaction 2 Reaction 3
    B. Reaction 1 Reaction 2 Reaction 4
    C. Reaction 2 Reaction 1 Reaction 3
    D. Reaction 2 Reaction 1 Reaction 4

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18. 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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19. Which of the statements below gives a correct feature of a ligand?

 

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20. A primary alcohol is heated under reflux with an aqueous solution of the oxidizing agent KMnO4.

Which of the following is a possible product of this reaction?
A. B.
CH0794a CH0794b
C. D.
CH0794c CH0794d

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21. The structure of the hydrogen phosphate ion is shown.

8.1-637

How many H^ ions can react with one hydrogen phosphate ion?

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22. 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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23. Which group or species cannot act as a Lewis acid?

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24. Which statement about electrochemical cells is not correct?

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25. 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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