Oxidation, Reduction and Redox Equations QP.pdf

AQA Chemistry A-Level - Oxidation, Reduction and Redox Equations QP




Q1.
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–



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Half-equation for the reduction of Cr2O72– to Cr3+



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Overall equation



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(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)




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, 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)




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