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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. 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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2. 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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3. 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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4. The diagram below shows a Daniel cell. Zinc is more reactive than copper. When the spontaneous reaction occurs, which statement about the Daniel cell is correct?

CH0120

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5. 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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6. A heterolytic fission occurs in the C-Br bond in (CH3)3CBr. Which species is produced?

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7. 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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8. Which statement is correct?

 

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

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10. 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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11. Which statement about electrochemical cells is not correct?

 

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12. 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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13. 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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14. 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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15. 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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16. 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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17. 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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18. 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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19. What are the respective oxidation states of sulfur in the following sulfur-containing species?

SO3^2−,H2SO4,S8,S2O3^2−

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20. 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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21. Which of the below reactions shows the oxidation of a secondary alcohol?

 

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

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

 

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