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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. 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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2.

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3. Which of the following is a conjugate acid-base pair?

  • A. 8.1-642a
  • B. 8.1-642b
  • C. 8.1-642c
  • D. 8.1-642d

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4. Which of the following is correct?

 

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

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

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7. Compound C is produced from ethane in three reaction steps. The conditions used in the three steps are shown.
K2Cr2O7 and H2SO4 are oxidizing agents in step 3.

CH0795

Which row of the table is correct?

  • HCl is produced The product is distilled
    A. Step 1 Step 2
    B. Step 2 Step 2
    C. Step 1 Step 3
    D. Step 2 Step 3

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8. Which of the following acid-base pairs are correctly matched with the salt formed from their reaction?

  • Acid Base Salt
    A. Hydrochloric Potassium oxide KCl
    B. Nitric Ammonia NHCl
    C. Sulphuric Copper(II) hydroxide CuS
    D. Ethanoic Magnesium MgCO

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9. Which of the following reactions is  a neutralization reaction?

 

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10. 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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11. The reversible reaction between NH3 and H2SO4 is:

NH3+H2SO4⇌NH4^+ + HSO4^−

Which compounds act as bases in the forward and backward reactions?

  • Base in forward reaction Base in backward reaction
    A. NH3 NH4^+
    B. NH3 HSO4^−
    C. H2SO4 NH4^+
    D. H2SO4 HSO4^−

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

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13. The function of the acid-base indicator, In, can be expressed using the equation below

In+H2O ⇋InH^+ OH^−;  Kc=35
Blue    Yellow

Which of the below statements are correct?

I. The solution becomes darker blue with the addition of an acid
II. The solution is a pale green at equilibrium
III.   increases with the addition of an alkali

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14. Which statement about electrochemical cells is not correct?

 

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

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16. Which of the three oxides of period 3 below will cause a change in the pH of the solution when they react with water?

I. Na2O
II. SiO2
III. P4O10​

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17. Consider the following reactions involving metals and their aqueous nitrate solutions:

XNO3 Y(NO3)2 Z(NO3)
No reaction No reaction
Metal Y Grey solid of metal X observed No reaction
Metal Z Grey solid of metal X observed Pink solid of metal Y observed

Choose the correct order of the metals from the strongest oxidizing agent to the weakest?

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

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

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19. 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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20. What is the reducing agent in this reaction?

Zn (s)+2NO3^− (aq)+4H^+ (aq)→Zn^2+ (aq)+2NO2 (g)+2H2O (l)

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21. 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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22. 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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23. 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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24. 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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25. The correct sequence in decreasing order of pH for equimolar solutions is:

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