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) ➔ MgCl2(s) + H2O(l)

  B  

MgO(s) + 2HCl(aq) ➔ MgCl2(aq) + H2O(l)

  C  

MgO(s) + 2HCl(l) ➔ MgCl2(s) + H2O(l)

  D  

MgO(s) + 2HCl(l) ➔ MgCl2(aq) + H2O(l)

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Question 4

Which equation is not a neutralisation reaction?

  A  

Ca(s) + 2HCl(aq) ➔ CaCl2(aq) + H2(g)

  B  

H+(aq) + OH-(aq) ➔ H2O(l)

  C  

K2CO3(s) + 2HNO3(aq) ➔ 2KNO3(aq) + H2O(l) + CO2(g)

  D  

NH3(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 conversion is the metal reduced?

  A  

Cr2O72- ➔ CrO42-

  B  

MnO42- ➔ MnO4-

  C  

TiO2 ➔ TiO32-

  D  

VO3- ➔ VO2+

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