Question 1

Chlorine is added to 2 cm3 of a dilute solution of potassium iodide.

The equation for the reaction between chlorine and iodide ions is

Cl2(aq) + 2I-(aq) ➔ I2(aq) + 2Cl-(aq)

Which statement is correct?

  A  

iodide ions oxidise chlorine

  B  

iodide ions reduce chlorine

  C  

chlorine reduces iodide ions

  D  

chlorine is neither oxidised nor reduced

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Question 2

Redox reactions occur very frequently in the chemistry of group VII.

Which statement is correct?

  A  

chlorine will oxidise bromide ions but not iodide ions

  B  

fluorine is the weakest oxidising agent out of F2, Cl2, Br2 and I2

  C  

iodide ions are the weakest reducing agent out of F-, Cl-, Br- and I-

  D  

when chlorine reacts with water, chlorine is both oxidised and reduced


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Question 3

Chlorine gas is widely used to treat contaminated water.

Which species present in water when chlorine gas has been added is responsible for killing bacteria?

  A  

ClO2- 

  B  

 Cl-

  C  

HCl

  D  

OCl-

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Question 4

Why do the boiling points of the halogens increase down the group?

  A  

there is an increase in bond enthalpy

  B  

there is an increase in bond polarity

  C  

there is an increase in the strength of instantaneous dipoles

  D  

there is a decrease in electronegativity

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Question 5

Which statement about the reactions of halogens with halide ions is correct?

  A  

I2(aq) can oxidise Br-(aq)

  B  

Cl2(aq) can reduce Br-(aq)

  C  

Br-(aq) can reduce Cl2(aq)

  D  

Cl-(aq) can oxidise I2(aq)

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Question 6

Chlorine reacts with cold, dilute, aqueous sodium hydroxide.

Which is a complete list of the products?

  A  

sodium chloride, sodium chlorate(I) and water

  B  

sodium chlorate(I) and water


  C  

sodium chloride, sodium chlorate(V) and water

  D  

sodium chloride and sodium chlorate(I)

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Question 7

Which property increases down group 7?

  A  

ability to oxidise a given reducing agent

  B  

boiling point

  C  

electronegativity

  D  

first ionisation energy

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Question 8

Which equation shows a redox reaction that does not occur?

  A  

Br2(aq) + 2KI(aq) ➔ I2(aq) + 2KBr(aq)

  B  

Cl2(g) + 2KI(aq) ➔ I2(aq) + 2KCl(aq)

  C  

Cl2(g) + 2KBr(aq) ➔ Br2(aq) + 2KCl(aq)

  D  

I2(aq) + 2KBr(aq) ➔ Br2(aq) + 2KI(aq)

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Question 9

What is the best oxidising agent?

  A  

F2

  B  

F-

  C  

I2

  D  

I-

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