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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.  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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2. 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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3. 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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4.

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

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

 

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

SO3^2−,H2SO4,S8,S2O3^2−

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8. 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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9. 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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10. A primary alcohol is heated under reflux with an aqueous solution of the oxidizing agent KMnO4.

Which of the following is a possible product of this reaction?
A. B.
CH0794a CH0794b
C. D.
CH0794c CH0794d

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

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

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

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14. 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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15. 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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16. Which statement about electrochemical cells is not correct?

 

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17. 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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18. Which of the below reactions shows the oxidation of a secondary alcohol?

 

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19. 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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20. 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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21. Which of the following reagents is used to differentiate between C3H8 and C3H6 and what change of color would be observed?

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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. 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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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 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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