PART - 1 CH - 1 Chemical Reactions and Equations — Science STD 10 — Question
Gujarat BoardEnglish MediumSTD 10SciencePART - 1 CH - 1 Chemical Reactions and Equations4 Marks
Question
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
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Answer
In displacement reaction, more reactive element displaces less reactive element from its solution. For example, In case of Zn and $Ag , Zn$ being more reactive than Ag , it displaces Ag from its solution of $AgNO _3$. (i) $Zn ( s )+2 AgNO _3(aq)$ $\longrightarrow$$Zn\left(NO_3\right)_2(aq)+2 Ag(s)$ Similarly, Fe being more reactive displaces Cu from $CuSO _4$ solution. (ii) $Fe ( s )+ CuSO _4( aq ) \longrightarrow$$FeSO_4(aq)+Cu(s)$ In double displacement reaction, two compounds exchange their ions to form two new compounds. For example, $\begin{array}{l} \text { (i) } Na _2 SO _4( aq )+ BaCl _2( aq )\longrightarrow BaSO _4(s)+2 NaCl ( aq )\end{array}$ ${(ii)}2 KBr ( aq )+ BaI _2( aq ) \longrightarrow$ $2 KI (aq)+ BaBr _2(s)$
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