Which of the following is a metal displacement reaction ?
Which of the following is a metal displacement reaction ?
The correct option is A
Displacement reactions : These reactions are redox reactions in which one element of the compound is replaced by atom or ion of another element. It can be represented as
AB+C⟶AC+B
The necessary condition, for the reaction is that C is more reactive than B. Since B and C are in their elemental state, the reaction is a redox reaction, where the main step involves the movement of electrons from one reactant to another. Displacement reactions can be further classified on the basis of nature of displacing element, into metal and non-metal displacements.
Metal displacement: If one metal is more easily oxidized than another, it can displace the other metal from its compounds by a redox reaction. Such a reaction can be represented as
AX+M⟶MX+A
These reactions are also called single displacement reactions. The atoms of more active metals are oxidized and become ions whereas the ions of less active metals are reduced and become atoms. Some examples are
Cu(s)+2AgNO3(aq)⟶2Ag(s)+Cu(NO3)2(aq)
Zn(s)+HgO(s)⟶ZnO(s)+Hg(l)
Cr2O3(s)+Al(s)⟶Al2O3(s)+Cr(s)
2Cr(s)+3Cu(NO3)2(aq)⟶3Cu(s)+2Cr(NO3)2(aq)
Displacement reactions : These reactions are redox reactions in which one element of the compound is replaced by atom or ion of another element. It can be represented as
AB+C⟶AC+B
The necessary condition, for the reaction is that C is more reactive than B. Since B and C are in their elemental state, the reaction is a redox reaction, where the main step involves the movement of electrons from one reactant to another. Displacement reactions can be further classified on the basis of nature of displacing element, into metal and non-metal displacements.
Metal displacement: If one metal is more easily oxidized than another, it can displace the other metal from its compounds by a redox reaction. Such a reaction can be represented as
AX+M⟶MX+A
These reactions are also called single displacement reactions. The atoms of more active metals are oxidized and become ions whereas the ions of less active metals are reduced and become atoms. Some examples are
Cu(s)+2AgNO3(aq)⟶2Ag(s)+Cu(NO3)2(aq)
Zn(s)+HgO(s)⟶ZnO(s)+Hg(l)
Cr2O3(s)+Al(s)⟶Al2O3(s)+Cr(s)
2Cr(s)+3Cu(NO3)2(aq)⟶3Cu(s)+2Cr(NO3)2(aq)
