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Oxidation, Reduction and Redox Equations QP.pdf
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AQA Chemistry A-Level - Oxidation, Reduction and Redox Equations QPQ1.
This question is about redox reactions.
(a) State, in terms of electrons, the meaning of the term oxidising agent.
___________________________________________________________
(1)
(b) Cr2O72– can oxidise SO32– in acidic conditions to form Cr3+ and SO42–
Deduce a half-equation for the oxidation of SO32– to SO42–
Deduce a half-equation for the reduction of Cr2O72– to Cr3+
Deduce the overall equation for the oxidation of SO32– by Cr2O72–
Half-equation for the oxidation of SO32– to SO42–
___________________________________________________________
Half-equation for the reduction of Cr2O72– to Cr3+
___________________________________________________________
Overall equation
___________________________________________________________
(3)
(Total 4 marks)
Q2.
Which compound contains a chlorine atom with an oxidation state of +4?
A KClO4
B CCl4
C ClO2
D ClO2F
(Total 1 mark)
Page 1 of 5
, AQA Chemistry A-Level - Oxidation, Reduction and Redox Equations QP
Q3.
NO2− ions can be reduced in acidic solution to NO How many electrons are
gained when each NO2− ion is reduced?
A 1
B 2
C 3
D 4
(Total 1 mark)
Q4.
Which compound contains chlorine in an oxidation state of +1?
A Cl2O
B KClO3
C ClF3
D CCl4
(Total 1 mark)
Q5.
In which conversion is the metal reduced?
A Cr2O72− → CrO42−
B MnO42− → MnO4−
C TiO2 → TiO32−
D VO3− → VO2+
(Total 1 mark)
Page 2 of 5
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