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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 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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2. An aqueous solution of nitric acid HNO3 has a  of 4. How many moles of this acid are found in 1dm^3 of the solution?

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

 

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

 

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5. 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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6. 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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7. 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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8. 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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9. Which statement about bonding is correct?

 

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10. 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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11. 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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12. Which of the following statements concerning acids and bases is  true?

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13. Which one of the following statements about acids is/are true?

I. Acids will neutralize bases to form salts
II. Acids produce solutions with a pH greater than 7
III. Acids ionize to form H^+ ions when dissolved in water

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14. 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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15.  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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16. 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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17. What feature must all Lewis bases have?

 

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

NaOH,Na2CO3,NaCl

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

 

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21. 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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22. 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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23. Which expression represents Ka for CH3COOH?

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

 

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

 

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