Group 7
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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?

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

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

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

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

Group 7 Questions

Practise Edexcel GCSE Chemistry Group 7 with exam-style questions for Foundation and Higher tier. 87 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Group 7 Questions

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