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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. 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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2. Which of the following expressions for Kw 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. In order to prepare a solution of 0.1 mol dm^−3 with the highest pH, substance  is dissolved in water. Substance  is:

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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. What statements about indicators are correct?

I. Indicators are typically weak acids or weak bases
II. Indicators are different colours in acidic and alkaline conditions
III. The midpoint of the colour change of an indicator occurs when [HIn]=[In−]

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7. Which expression represents Ka for CH3COOH?

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8. Which row of the table is correct for a spontaneous reaction?

  • Ecellθ ΔGθ
    A. Positive Negative
    B. Negative Negative
    C. Positive Positive
    D. Negative Positive

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

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10. Which indicator would be most suitable for a titration between sodium hydroxide and ethanoic acid?

Indicator pKa
Methyl orange 3.7
Bromocresol green 4.7
Bromothymol blue 7.0
Phenolphthalein 9.6

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11. Which of the following are the standard conditions for standard cell potentials?

I.A temperature of 298K
II.A pressure of 100 kPa
III.Solution concentrations of 1 mol dm^−3

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12. 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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13. The nitration of benzene is an example of what type of reaction mechanism?

 

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14. Which of the following is correct?

 

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15. Which statement about electroplating an object with silver is incorrect?

 

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16. 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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17. Place the following 1.0 mol dm^−3 solutions in order of increasing :

NaOH,Na2CO3,NaCl

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18. Which statement about electrochemical cells is not correct?

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

 

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20. Which expression represents Ka for CH3COOH?

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21. Which of the following statements concerning acids and bases is  true?

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22. 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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23. Which of the following solutions, when mixed with equal volumes at equal concentrations, form a buffer solution?

 

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24. Which of the following reactions could not be performed using aqueous sodium hydroxide as the only reagent?

  •
    A. 20.2-CH0478A
    B. 20.2-CH478
    C. 20.2-CH0478C
    D. 20.2-CH0478D

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25. 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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