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CAIE A-Level Chemistry AS 11 Group 17 Questions

Practise halogen property trends, displacement and disproportionation reactions, and hydrogen halide behaviour.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Covered syllabus points

11.1 Physical properties of the Group 17 elements11.2 The chemical properties of the halogen elements and the hydrogen halides11.3 Some reactions of the halide ions11.4 The reactions of chlorine

Question 1

[Maximum number: 1]

Which row correctly describes the properties of the halogens as Group 17 is descended from chlorine to iodine?

volatility

strength as

oxidising agent

decreases

decreases

decreases

increases

increases

decreases

increases

increases

Question 2

[Maximum number: 1]

ICl is made when Cl2\mathrm{Cl}_{2} and I2\mathrm{I}_{2} react together.

Cl2+I2⇌2ICl\mathrm{Cl}_{2}+\mathrm{I}_{2} \rightleftharpoons 2 \mathrm{ICl}

ICl reacts with water.

5ICl+3H2O→5HCl+HIO3+2I25 \mathrm{ICl}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow 5 \mathrm{HCl}+\mathrm{HIO}_{3}+2 \mathrm{I}_{2}

Which row is correct?

oxidation number of I in ICl

reaction occurring when ICl reacts with H2O\mathrm{H}_{2} \mathrm{O}

+1

the iodine atoms are oxidised to form I2\mathrm{I}_{2}

+1

the iodine atoms are oxidised to form HIO3\mathrm{HIO}_{3}

-1

the chlorine atoms are reduced to form HCl

-1

the iodine atoms are oxidised to form HIO3\mathrm{HIO}_{3}

Question 3

[Maximum number: 1]

The solids sodium chloride and sodium iodide both react with concentrated sulfuric acid at room temperature.

With NaCl , the products are NaHSO4\mathrm{NaHSO}_{4} and HCl .
With NaI , the products are NaHSO4,HI,I2,SO2,H2O,S\mathrm{NaHSO}_{4}, \mathrm{HI}, \mathrm{I}_{2}, \mathrm{SO}_{2}, \mathrm{H}_{2} \mathrm{O}, \mathrm{S} and H2 S\mathrm{H}_{2} \mathrm{~S}.
What is the explanation for this difference in products?

A

Chloride ions will displace iodine from the solution.

B

Hydrogen chloride is more volatile than hydrogen iodide.

C

lodide ions are better reducing agents than chloride ions.

D

Sulfuric acid is able to act as a dehydrating agent with NaI .

Question 4

[Maximum number: 1]

Chlorine gas is reacted with cold aqueous sodium hydroxide.
Which statement is correct for this reaction?

A

Chlorine is both oxidised and reduced.

B

Chlorine is neither oxidised nor reduced.

C

Chlorine is oxidised but not reduced.

D

Chlorine is reduced but not oxidised.

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