What are the oxidation numbers of manganese in the manganese compounds shown below?
sc-7 sb-2-Oxidation and Reductionimg_no 183.jpg
  • A
  • B
  • C
  • D
Which of the following is the oxidising agent in the experiment shown the diagram?
sc-7 sb-2-Oxidation and Reductionimg_no 184.jpg
  • 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?
sc-7 sb-2-Oxidation and Reductionimg_no 185.jpg
  • 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?
sc-7 sb-2-Oxidation and Reductionimg_no 186.jpg
  • 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
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
Oxidation involves
  • gaining electrons; gaining oxygen
  • losing electrons; losing oxygen
  • gaining electrons; losing oxygen
  • losing electrons; gaining oxygen
Reduction 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 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
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