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

 

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3. 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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4. 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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5. 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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6. 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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7. Which statement is correct?

 

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

SO3^2−,H2SO4,S8,S2O3^2−

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10. 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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11. Which of the below reactions shows the oxidation of a secondary alcohol?

 

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12. 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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13. Which statement about electrochemical cells is not correct?

 

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

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15. 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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16. What is the  of a 0.001 mol dm^−3 aqueous solution of KOH at  given that it ionizes completely?

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17. In order to prepare a solution of 0.1 mol dm^− with the highest , substance  is dissolved in water. Substance  is:

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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. What happens to nitrogen when nitrate changes to nitrite?

 

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

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

 

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24. 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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25. 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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