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Qualitative analysis: tests for ions

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Question 27

A crystalline solid X X\,X contains a single cation and a single anion. A student carries out two qualitative tests on XXX:

  1. A sample of X X\,X is warmed with aqueous sodium hydroxide. A pungent gas is evolved which turns damp red litmus paper blue.
  2. An aqueous solution of X X\,X is acidified with dilute nitric acid, and then aqueous silver nitrate is added. A cream precipitate forms.

Which of the following correctly identifies the formula of X X\,X and describes the behaviour of the cream precipitate when excess concentrated aqueous ammonia is added?

NH4BrNH_4BrNH4​Br; the precipitate dissolves to form a colourless solution

NH4BrNH_4BrNH4​Br; the precipitate remains insoluble

NH4INH_4INH4​I; the precipitate remains insoluble

NaBrNaBrNaBr; the precipitate dissolves to form a colourless solution

Qualitative analysis: tests for ions Questions

  1. GCSE
  2. /Chemistry
  3. /Qualitative analysis: tests for ions

Practise Edexcel GCSE Chemistry Qualitative analysis: tests for ions with exam-style questions for Foundation and Higher tier. 127 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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