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Class 10ScienceChemical Substances – Nature and BehaviourMetals and Non-metalsMedium
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In which situation is hydrogen gas most likely to be formed?

Answer and explanation

Correct answer: Adding dilute sulphuric acid to zinc

Zinc is above hydrogen in the reactivity series, so it displaces hydrogen from dilute sulphuric acid: Zn + H₂SO₄ → ZnSO₄ + H₂. Hence option A is correct. An acid reacting with sodium carbonate releases carbon dioxide, not hydrogen. Carbon dioxide passed into limewater forms calcium carbonate, while heating copper sulphate does not produce hydrogen gas. The type of acid and the metal’s reactivity are decisive.

Related tags

Metal Acid ReactionHydrogenZincMetals And Non MetalsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScienceClass 10 Mcq
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10 more MCQs
  1. 1Metal A displaces metal B from a solution of its salt, and metal B displaces metal C from a solution of its salt. Which metal is the least reactive?
  2. 2Copper deposits on an iron nail placed in copper sulphate solution. This observation is based on which principle?
  3. 3In galvanisation, the zinc layer protects iron from contact with which substances?
  4. 4Which statement correctly describes the general nature of metal oxides and non-metal oxides?
  5. 5Why is gas not released every time a metal is added to an acidic solution?
  6. 6Why is the aqueous solution of non-metal oxides often acidic?
  7. 7What is the correct reason for avoiding storage of curd in a copper vessel?
  8. 8What is the general nature of metal oxides?
  9. 9What is the general nature of metal oxides?
  10. 10Which gas is produced at the anode in the chlor-alkali process?
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