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Chemistry · Oct / Nov 2022 · Paper 12 · Question 2

5070Experimental design

When iron reacts with dilute hydrochloric acid, hydrogen is formed. Impurities in the iron mean that some hydrogen sulfide gas is also formed. Hydrogen sulfide gas is soluble in water. Water vapour can be removed from a mixture of gases using concentrated sulfuric acid. Which diagram shows apparatus suitable to prepare a pure, dry sample of hydrogen?

  1. Airon and hydrochloric acid; water; concentrated sulfuric acid
  2. Biron and hydrochloric acid; water; concentrated sulfuric acid
  3. Ciron and hydrochloric acid; water; concentrated sulfuric acid
  4. Diron and hydrochloric acid; concentrated sulfuric acid; water

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Correct answer: C. iron and hydrochloric acid; water; concentrated sulfuric acid

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