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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. Which statement is correct?

 

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

 

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

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

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6. Consider the following equations:

Equation 1:
2 ClO3^−(aq)+I2(aq)→Cl2(aq)+2 IO3^−(aq)

Equation 2:
Cl2(aq)+2 NaOH(aq)→NaCl(aq)+NaClO(aq)+H2O(l)

Which statements about these reactions is/are not correct?

I.Iodine is reduced in equation 1
II.Chlorine is reduced only in equation 1
III. Chlorine is oxidized and reduced in equation 2

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7. 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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8. Compound B has the following skeletal structural formula.

CH0792

When compound B reacts with a hydroxide ion, the C-Br bond is broken.

Which of the following statements are true?

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

 

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

SO3^2−,H2SO4,S8,S2O3^2−

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13. 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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14. The below diagram shows an electrolytic cell. At which electrode will bromine form, and what is the process taking place there?

CH0117

Electrode Process
A. R reduction
B. S oxidation
C. S reduction
D. R oxidation

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15. What happens to the Mn^3+ (aq) ion when it is converted to MnO4^− (aq?

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16. 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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17. 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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18. When powdered calcium oxide is added to dilute hydrochloric acid in a conical flask, the products are water, positive calcium ions and negative chloride ions.

8.1-638

Which species is the conjugate base of hydrochloric acid in this reaction?

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

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20. Which statement about electrochemical cells is not correct?

 

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

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22. Which of the following statements about pH is incorrect?

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23. 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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24. 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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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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