Respuesta :
Among the choices provide above the redox reactions do you expect to occur spontaneously in the forward direction is the below:
Fe2+(aq) + Zn(s) -> Fe(s) + Zn2+(aq)
Al(s) + 3Ag+(aq) -> Al3+(aq) + 3Ag(s)
Those reactions will proceed when the metal that is a solid is higher up in the electromotive series than the metal that is an ion (dissolved).
Fe2+(aq) + Zn(s) -> Fe(s) + Zn2+(aq)
Al(s) + 3Ag+(aq) -> Al3+(aq) + 3Ag(s)
Those reactions will proceed when the metal that is a solid is higher up in the electromotive series than the metal that is an ion (dissolved).
Answer: The correct answer is Option 1 and Option 2.
Explanation:
Redox reactions are termed as the reactions in which reduction and oxidation reactions occur simultaneously.
Reduction reactions are the ones where a substance gains electrons. The oxidation state of the substance gets reduced.
Oxidation reactions are the ones where a substance looses electrons. The oxidation state of the substance is increased.
All the given reactions are a type of single displacement reactions. In this, a more reactive metal displaces a less reactive metal from its chemical reaction. The reactivity is determined from a series known as reactivity series. A metal which lies above in the series is more reactive than the metals which lie below in the series.
[tex]A+BC\rightarrow AC+B[/tex]
From the given options:
Option 1: [tex]Ni(s)+Pb^{2+}(aq.)\rightarrow Ni^{2+}(aq.)+Pb(s)[/tex]
Here, nickel lies above in the series than lead. Thus, it will easily replace lead from its chemical reaction.
Option 2: [tex]Al(s)+3Ag^+(aq.)\rightarrow Al^{3+}(aq.)+3Ag(s)[/tex]
Here, aluminium lies above in the series than silver. Thus, it will easily replace silver from its chemical reaction.
Option 3: [tex]Ni(s)+Zn^{2+}(aq.)\rightarrow Ni^{2+}(aq.)+Zn(s)[/tex]
Here, nickel lies below in the series than zinc. Thus, it will not easily replace zinc from its chemical reaction.
Option 4: [tex]Fe^{2+}(aq.)+Cd(s)\rightarrow Fe(s)+Cd^{2+}(aq.)[/tex]
Here, cadmium lies below in the series than iron. Thus, it will not easily replace iron from its chemical reaction.
Thus, the correct answer is Option 1 and Option 2.
