The standerd potential at `25^(@)` for the following Half rection is given : `Zn^(2+)+2e^(-)toZn,E^(@)=-0.762 V` `Mg^(2+)+2e^(-)toMg,E^(@)=-2.37 V` When Zinc dust is added to the solution of `MgCl_(2)`.
A
`ZnCl_(2)` is formed
B
Mg is percipitaed
C
Zn dissolved in the solution
D
No reaction take place
Text Solution
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The correct Answer is:
D
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The standard potentials at 25^@C for the following half reactions are given against them Zn^(2+) +2e^(-) rarr Zn, E^0 =-0 . 762 V Mg^(2+) +2e^(-) rarr Mg, =- 2.37 V . When zinc dust is added to a solution of magnesium chloride .
The standard potential E^(@) for the half reactions are as : Zn rarr Zn^(2+) + 2e^(-), E^(@) = 0.76V Cu rarr Cu^(2+) +2e^(-) , E^(@) = -0.34 V The standard cell voltage for the cell reaction is ? Zn +Cu^(2) rarr Zn ^(2+) +Cu
The standard reduction potential E^(@) , for the half reaction are : {:(Zn rarr Zn^(2+) + 2e^(-),,,E^(@) = 0.76 V),(Cu rarr Cu^(2+) + 2e^(-),,,E^(@) = 0.34 V):} The emf for the cell reaction, Zn(s)+Cu^(2+) rarr Zn^(2+) + Cu(s) is :
