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Chemical Reactions and Equations — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceChemical Reactions and Equations2 Marks
Question
Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer.
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Answer

  1. Evolution of gas.
For example: When sodium carbonate reacts with dilute hydrochloric acid, carbon dioxide gas is evolved.
  1. Formation of a precipitate.
For example: When potassium iodide solution is added to a solution of lead nitrate, yellow precipitate of lead iodide is formed.

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