Electrochemistry Exam-style MCQs | A-Level Chemistry CIE

Question 1

Which compound contains two different elements with identical oxidation states?

A

HClO

B

Mg(OH)₂

C

Na₂SO₄

D

NH₄Cl

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Question 2

What is the oxidation number of oxygen in OF₂?

A

-2

B

-1

C

+1

D

+2

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Question 3

Which of the following equations has the correct state symbols for the reaction of dilute hydrochloric acid with magnesium oxide?

A

MgO_(s) + 2HCl_(aq) ➔ MgCl_2(s) + H₂O_(l)

B

MgO_(s) + 2HCl_(aq) ➔ MgCl_2(aq) + H₂O_(l)

C

MgO_(s) + 2HCl_(l) ➔ MgCl_2(s) + H₂O_(l)

D

MgO_(s) + 2HCl_(l) ➔ MgCl_2(aq) + H₂O_(l)

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Question 4

Which equation is not a neutralisation reaction?

A

Ca_(s) + 2HCl_(aq) ➔ CaCl_2(aq) + H₂_(g)

B

H⁺_(aq) + OH^-_(aq) ➔ H₂O_(l)

C

K₂CO_3(s) + 2HNO_3(aq) ➔ 2KNO_3(aq) + H₂O_(l) + CO_2(g)

D

NH_3(aq) + HCl_(aq) ➔ NH₄Cl_(aq)

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Question 5

The equation for a redox reaction is shown below.

2HClO₃ + 2HCl ➔ 2ClO₂ + Cl₂ + 2H₂O

Which statement is correct?

A

Cl is both oxidised and reduced

B

Cl is oxidised and O is reduced

C

O is both oxidised and reduced

D

O is oxidised and Cl is reduced

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Question 6

Which reaction shows chlorine only being oxidised?

A

Cl₂ + H₂O ➔ HCl + HClO

B

2ClO₂ + 2NaOH ➔ NaClO₂ + NaClO₃ + H₂O

C

4KClO₃ ➔ 3KClO₄ + KCl

D

MnO₂ + 4HCl ➔ MnCl₂ + Cl₂ + 2H₂O

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Question 7

Which of these is not a redox reaction?

A

Cu₂O + H₂SO₄ ➔ CuSO₄ + Cu + H₂O

B

MgO + 2HCl ➔ MgCl₂ + H₂O

C

SnCl₂ + HgCl₂ ➔ Hg + SnCl₄

D

MnO₂ + 4HCl ➔ MnCl₂ + 2H₂O + Cl₂

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Question 8

Which species contains an element with an oxidation state of +4?

A

NO₂⁺

B

ClO₃^-

C

H₂SO₃

D

PCl₅

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Question 9

In which reaction is hydrogen acting as an oxidising agent?

A

Cl₂ + H₂➔ 2HCl

B

(CH₃)₂CO + H₂ ➔ (CH₃)₂CHOH

C

N₂ + 3H₂ ➔ 2NH₃

D

2Na + H₂ ➔ 2NaH

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Question 10

In which conversion is the metal reduced?

A

Cr₂O₇^2- ➔ CrO₄^2-

B

MnO₄^2- ➔ MnO₄^-

C

TiO₂ ➔ TiO₃^2-

D

VO₃^- ➔ VO²⁺

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