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Question

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?


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Solution

Reaction of an acid with a metal:

  • When an acid reacts with a metal, it forms a salt.
  • Hydrogen which is in all the acids gets displaced and liberated as hydrogen gas.

Acids+MetalsSalt+Hydrogengas

Example:

  • Hydrogen gas is produced when dilute HCl combines with zinc metal.

Zns+2HClaqZnCl2aq+H2g

Test for the presence of hydrogen gas:

  • A lighted splint positioned near the mouth of a test tube ignites with a squeaky pop if hydrogen is present.

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