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chemical reactions and equations — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencechemical reactions and equations3 Marks
Question
What is meant by displacement reaction? Give examples.
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Answer

  • Chemical reaction in which more reactive element displaces the less reactive element from its compound (solution) is called displacement reaction.
  • Examples :
  • $(1) \mathrm{Zn}(\mathrm{~s})+2 \mathrm{AgNO}_3(\mathrm{aq}) \rightarrow \mathrm{Zn}\left(\mathrm{NO}_3\right)_2(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{~s})$
  • $(2) \mathrm{Fe}(\mathrm{~s})+\mathrm{CuSO}_4(\mathrm{aq}) \rightarrow \mathrm{FesO}_4(\mathrm{aq})+\mathrm{Cu}(\mathrm{~s})$
  • $(3) \mathrm{Zn}(\mathrm{~s})+\mathrm{CuSO}_4(\mathrm{aq}) \rightarrow \mathrm{ZnSO}_4(\mathrm{aq})+\mathrm{Cu}(\mathrm{~s})$
  • $(4) \mathrm{Pb}(\mathrm{~s})+\mathrm{CuCl}_2(\mathrm{aq}) \rightarrow \mathrm{PbCl}_2(\mathrm{aq})+\mathrm{Cu}(\mathrm{~s})$
  • Here, $Zn, Fe$ and $Pb$ are more reactive than $Ag$ and $Cu$.

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