Which of the following pairs will give displacement reactions?
(a) NaCl solution and copper metal.
(b) MgCl2 solution and aluminium metal.
(c) FeSO4 solution and silver metal.
(d) AgNO3 solution and copper metal
Correct Answer: (d) AgNO3 solution and copper metal
Explanation: A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule
Copper displaces the silver cations (reducing them to the elemental metal), in the process copper itself is oxidized to Copper II cations (Cu2+) and goes into solution. So silver metal precipitates out and a copper II nitrate solution will be remaining.
[Extra information: The reactions in which one element takes the place of another element in a compound, are known as displacement reactions. A displacement reaction is one wherein the atom or a set of atoms is displaced by another atom in a molecule. The general equation for displacement reaction is,
A + B-C → A-C + B.
Double Displacement Reactions are reactions in which there is an exchange of ions between the reactants.
Eg. $\underset{(aq)}{Pb(NO_{3})_{2}}+\underset{(aq)}{2KI}\rightarrow \underset{yellow \; pp}{PbI_{2}(\downarrow)} +\underset{(aq)}{2KNO_{3}}$]
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