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Subjects
Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Which gas is generally formed in the reaction of an acid with an active metal?

Answer and explanation

Correct answer: Hydrogen

An active metal displaces hydrogen from a dilute acid. The general reaction is: metal + acid → salt + hydrogen gas. For example, zinc reacts with dilute hydrochloric acid as Zn + 2HCl → ZnCl₂ + H₂. Thus option A is correct. Carbon dioxide is typically released when an acid reacts with a carbonate, while oxygen and chlorine are not the general products of an acid-active-metal reaction.

Related tags

Acid Metal ReactionHydrogenDisplacement ReactionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
  4. 4What is the general nature of an aqueous soap solution?
  5. 5Which of the following substances turns red litmus paper blue?
  6. 6What is the nature of a solution whose pH is less than 7?
  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
  9. 9Which gas is generally produced when dilute acids react with active metals?
  10. 10A student dips red litmus paper into a soap solution. What will be the colour of the litmus paper?
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