NCERT Solution for Class 10 Science Chapter 1
Chemical Reactions and Equations
Exercises Questions
Page No-16
Questions No-13
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
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Displacement Reaction : In this reaction more reactive element displaces the less reactive element
AB + C → AC + B
eg.:
(i) Fe + CuSO4 → FeSO4 + Cu
(ii) Pb + CuCl2 → PbCl2 + Cu
Double Displacement Reaction : In this reaction exchange of ions takes place
AB + CD → AC + BD
eg.:
(i) Na2SO4 + BaCl2 → 2NaCl + BaSO4
(ii) HCl + AgNO3 → AgCl + HNO3
When a more reactive element displaces a less reactive element from its salt solution, then it is called displacement reaction. While there is an exchange of ions between the reactants to produce new substances, it is called double displacement reaction. In displacement reaction one displacement takes place. While in double displacement reaction two displacements takes place.
Displacement reaction
Mg(s)+2HCl(aq)→MgCl2+H2(g)
Double displacement reaction
2KBr(aq)+BaCl2→2Kl(aq)+BaBr3(s)