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- 1. Multiple Choice
Which of the following statements refers to an oxidation process?
Hydrogen is added to ethene
Oxygen is removed from carbon dioxide
Chlorine accepts electrons
Increase in the oxidation number of magnesium metal
- 2. Multiple Choice
Which of these equations represents a redox reaction?
Ca(HCO3)2 --> CaCO3 + H2O + CO2
CH3COOH + NaOH --> CH3COONa + H2O
Zn + 2FeCl3 --> ZnCl2 + 2FeCl2
NaCl + AgNO3 --> AgCl + NaNO3
- 3. Multiple Choice
What is the oxidation number of chlorine in ClO3- ?
-1
+1
-1
+5
- 4. Multiple Choice
What are the oxidation numbers of manganese in the manganese compounds shown below?
A
B
C
D
- 5. Multiple Choice
Which of the following is the oxidising agent in the experiment shown the diagram?
Iron(II) ion
Sulphate ion
Iron
Bromine
- 6. Multiple Choice
Which of the following statements is not true when zinc powder is added to dilute hydrochloric acid?
Zinc is oxidised
Chloride ion acts as an oxidising agent
Hydrogen ion is reduced
Electrons are transferred in the reaction
- 7. Multiple Choice
The table shows four chemical changes. Which changes involve donation of electrons?
P and Q
P and R
Q and S
R and S
P and R
Q and S
R and S
- 8. Multiple Choice
The diagram shows two metals P and Q connected together in a liquid jelly. Metal Q is more electropositive than metal P. Which of the following statements is true?
P is oxidised
Q is reduced
The oxidation number of metal P has increased
The oxidation number of metal Q has increased
- 9. Multiple Choice
A mixture of magnesium oxide, copper(II) oxide and zinc powder is heated in a crucible until no further changes are observed. After heating, the mixture contains:
magnesium, copper(II) oxide and zinc
magnesium oxide, copper and zinc oxide
magnesium oxide, copper(II) oxide and zinc
magnesium, copper and zinc oxide
- 10. Multiple Choice
In an electrochemical cell, tin becomes a negative terminal when it is connected to
aluminium
lead
magnesium
zinc
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