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7.2 Group 7

7.2 Group 7

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Question 17

A solid sodium halide, NaX\text{NaX}NaX, undergoes the following reactions:

  1. Treatment of the solid with concentrated sulfuric acid produces misty fumes, a choking gas, and an orange-brown vapor.
  2. Treatment of its aqueous solution with acidified silver nitrate produces a cream precipitate.

Which of the following correctly identifies the halide ion, X−\text{X}^-X−, and the role of sulfuric acid in the redox reaction that produces the orange-brown vapor?

A

Halide ion: Br−\text{Br}^-Br−; role of sulfuric acid: oxidising agent

B

Halide ion: Br−\text{Br}^-Br−; role of sulfuric acid: reducing agent

C

Halide ion: I−\text{I}^-I−; role of sulfuric acid: oxidising agent

D

Halide ion: Cl−\text{Cl}^-Cl−; role of sulfuric acid: acid

Markscheme

7.2 Group 7 Questions

  1. GCSE
  2. /Chemistry
  3. /7.2 Group 7

106 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.

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