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CAIE A-Level Chemistry AS 11.3.2 Reactions of Halide Ions Questions

Practise silver-nitrate tests followed by ammonia and the acid–base and redox reactions of halides with concentrated H2SO4.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • state AgCl white, AgBr cream and AgI yellow, then use ammonia solubility to distinguish them
  • write the initial proton-transfer equation producing HX when a solid halide meets concentrated H2SO4
  • for Br− or I−, balance the subsequent redox equations and identify SO2, sulfur or H2S products

CAIE A-Level Chemistry AS 11.3.2 Reactions of Halide Ions Questions question 1

[Maximum number: 2]

Hydrogen halides are compounds formed when halogens (Group 17 elements) react with hydrogen. The bond polarity of the hydrogen halides decreases from HF to HI.

Some relevant data are shown in the table.

Table for Question CAIE A-Level Chemistry AS 11.3.2 Reactions of Halide Ions Questions question 1 — CAIE A-Level Chemistry AS

The equation for the preparation of hydrogen chloride using concentrated sulfuric acid is shown.

H2SO4+NaCl→NaHSO4+HCl\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{NaCl} \rightarrow \mathrm{NaHSO}_{4}+\mathrm{HCl}

Explain why the reaction of concentrated sulfuric acid and sodium iodide is not suitable for the preparation of hydrogen iodide.

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