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Worksheets1.1 Oxidation & Reduction (C)
Total questions: 25
Worksheet time: 25mins
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
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
What is the oxidation number of chlorine in ClO3- ?
-1
+1
-1
+5
What are the oxidation numbers of manganese in the manganese compounds shown below?
A
B
C
D
Which of the following is the oxidising agent in the experiment shown the diagram?
Iron(II) ion
Sulphate ion
Iron
Bromine
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
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
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
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
In an electrochemical cell, tin becomes a negative terminal when it is connected to
aluminium
lead
magnesium
zinc
Oxidation involves
gaining electrons; gaining oxygen
losing electrons; losing oxygen
gaining electrons; losing oxygen
losing electrons; gaining oxygen
Identify the substance that is oxidised in the reaction between carbon and zinc oxide.
C + 2ZnO → CO2 + 2Zn
C
ZnO
CO2
Zn
Identify the substance that is reduced in the reaction between hydrogen and iron(II) oxide.
H2 + FeO → H2O + Fe
H2
FeO
H2O
Fe
Identify the substance that is oxidised in the reaction between aluminium and chromium(III) ion.
Al + Cr3+ → Al3+ + Cr
Al
Cr3+
Al3+
Cr
Identify the substance that is reduced in the reaction between copper(II) ion and magnesium.
Cu2+ + Mg → Cu + Mg2+
Cu2+
Mg
Cu
Mg2+
Identify the oxidising agent in the reaction between copper(II) oxide and hydrogen.
CuO + H2 → Cu + H2O
CuO
H2
Cu
H2O
Identify the reducing agent in the reaction between sulfuric acid and zinc.
H2SO4 + Zn → H2 + ZnSO4
H2SO4
Zn
H2
ZnSO4
Identify the oxidising agent in the reaction between iron(II) chloride and zinc.
2FeCl3 + 3Zn → 2Fe + 3ZnCl2
FeCl3
Zn
Fe
ZnCl2
Identify the reducing agent in the reaction between aluminium and iron(III) oxide.
Al + Fe2O3 → Al2O3 + Fe
Al
Fe2O3
Al2O3
Fe
What is the colour change of acidified KMnO4 solution when it is used as an oxidising agent?
from colourless to brown
from brown to colourless
from purple to colourless
from colourless to purple
When sulfur dioxide gas is passed through an acidified aqueous solution of X, the solution changes from orange to green. What is X?
methyl orange
potassium dichromate(VI)
potassium iodide
potassium manganate(VII)
An aqueous solution of potassium iodide turns from colourless to brown. What happens to the iodide ions?
Iodide ions are oxidised due to gain of electrons.
Iodide ions are oxidised due to loss of electrons.
Iodide ions are reduced due to gain of electrons.
Iodide ions are reduced due to loss of electrons.
Aqueous potassium iodide is a reducing agent and can be used as a test for an oxidising agent.
True
False
Acidified potassium manganate(VII) solution and acidified potassium dichromate(VI) solution are both oxidising agents used to test for a reducing agent.
True
False
