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Concept Detail
Chemistry / Chemical Reactions / Evolution of gas
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Evolution of gas

Evolution of gas:

Some of the chemical reactions occur with the evolution of a gas or a mixture of gases. For example,

  • Metals like zinc, magnesium, iron etc react with dilute hydrochloric acid with the evolution of hydrogen gas. The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas. Take some zinc granules in a conical flask. Add dilute sulphuric acid over zinc granules. We will see the bubbles of hydrogen gas being formed around zinc granules. If we touch the conical flask with our hand, we will find that it is somewhat hot. So, a change in temperature also occurs in this chemical reaction.
  • When lead nitrate is heated, it gets decomposed to give a solid residue of lead monoxide with the evolution of nitrogen dioxide and oxygen gases.

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