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Identifying the products of chemical reactions

Identifying the products of chemical reactions

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Question 11

An analytical chemist investigates an unknown crystalline solid, compound XXX.

  • Test 1: Compound X X\,X is dissolved in deionised water. Dilute hydrochloric acid is added to the solution, followed by the addition of aqueous barium chloride. A thick white precipitate forms.
  • Test 2: A portion of the original solid X X\,X is warmed with aqueous sodium hydroxide. A pungent gas is evolved that turns damp red litmus paper blue.

Which of the following correctly identifies the chemical formula of compound X X\,X and the simplified ionic equation for the reaction producing the precipitate in Test 1?

A

Formula: (NH4)2SO4(\text{NH}_4)_2\text{SO}_4(NH4​)2​SO4​ ; Ionic equation: Ba2+(aq)+SO42−(aq)→BaSO4(s)\text{Ba}^{2+}(\text{aq}) + \text{SO}_4^{2-}(\text{aq}) \rightarrow \text{BaSO}_4(\text{s})Ba2+(aq)+SO42−​(aq)→BaSO4​(s)

B

Formula: NH4SO4\text{NH}_4\text{SO}_4NH4​SO4​ ; Ionic equation: Ba2+(aq)+SO42−(aq)→BaSO4(s)\text{Ba}^{2+}(\text{aq}) + \text{SO}_4^{2-}(\text{aq}) \rightarrow \text{BaSO}_4(\text{s})Ba2+(aq)+SO42−​(aq)→BaSO4​(s)

C

Formula: (NH4)2SO4(\text{NH}_4)_2\text{SO}_4(NH4​)2​SO4​ ; Ionic equation: BaCl2(aq)+SO42−(aq)→BaSO4(s)+2Cl−(aq)\text{BaCl}_2(\text{aq}) + \text{SO}_4^{2-}(\text{aq}) \rightarrow \text{BaSO}_4(\text{s}) + 2\text{Cl}^-(\text{aq})BaCl2​(aq)+SO42−​(aq)→BaSO4​(s)+2Cl−(aq)

D

Formula: (NH4)2SO3(\text{NH}_4)_2\text{SO}_3(NH4​)2​SO3​ ; Ionic equation: Ba2+(aq)+SO32−(aq)→BaSO3(s)\text{Ba}^{2+}(\text{aq}) + \text{SO}_3^{2-}(\text{aq}) \rightarrow \text{BaSO}_3(\text{s})Ba2+(aq)+SO32−​(aq)→BaSO3​(s)

Markscheme

Identifying the products of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /Identifying the products of chemical reactions

41 exam-style questions on OCR GCSE Chemistry Identifying the products of chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.

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