Class 9 Chemistry

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Questions and Answers

What product is formed when red hot iron reacts with steam?

  • Magnesium oxide
  • Zinc oxide
  • Aluminium hydroxide
  • Triferric tetra-oxide (correct)

Which metal reacts with steam to liberate hydrogen gas and white ash?

  • Magnesium (correct)
  • Calcium
  • Aluminium
  • Zinc

Which metal sinks in water and reacts vigorously with the evolution of hydrogen?

  • Iron
  • Aluminium
  • Calcium (correct)
  • Zinc

What are the oxides and hydroxides of zinc and aluminium?

<p>Amphoteric (D)</p> Signup and view all the answers

What kind of reaction do zinc and aluminium undergo with hot concentrated alkalis?

<p>Form hydrogen and a soluble salt (A)</p> Signup and view all the answers

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