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

 

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3. Which of the following reagents is used to differentiate between C3H8 and C3H and what change of color would be observed?

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4. Which of the following can behave as a ligand?

I. BH3
II. NH3
III. CH4

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5. Which expression represents Ka for CH3COOH?

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

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10. What is the structure of the carbocation intermediate in the nitration of benzene?

  •
    A. 20.1-CH0422
    B. 20.1-CH0422b
    C. 20.1-CH0422c
    D. 20.1-CH0422d

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11. Which solution does not produce oxygen at the anode when electrolyzed with inert electrodes?

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12. The diagram below shows a voltaic cell. The overall reaction taking place in the cell is:

Mg(s)+Pb^2+(aq)→Pb(s)+Mg^2+(aq)

CH0115

Which statement is correct for the magnesium half cell?

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13. Which expression represents Ka for CH3COOH?

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

 

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15. Which of the following expressions for Kw is correct?

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16. What feature must all Lewis bases have?

 

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17. Which of the following is correct?

 

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18. 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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19. 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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20. Which statement about bonding is correct?

 

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21. Which statement about electrochemical cells is not correct?

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

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

 

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

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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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