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chemical reactions and equations — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencechemical reactions and equations2 Marks
Question
What is called double displacement reaction? Give examples.
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Answer

  • Chemical reaction in which two reactants react by exchange of ions is called double displacement reaction.
  • Examples:
  • (1) $\mathrm{Na}_2 \mathrm{SO}_4(\mathrm{aq})+\mathrm{BaCl}_2(\mathrm{aq}) \rightarrow \mathrm{BaSO}_4(\mathrm{~s})+2 \mathrm{NaCl}(\mathrm{aq})$
  • (2) $2 \mathrm{KBr}(\mathrm{aq})+\mathrm{Bal}_2(\mathrm{aq}) \rightarrow \mathrm{BaBr}_2(\mathrm{~s})+2 \mathrm{KI}(\mathrm{aq})$

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