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The standerd potential at 25^(@) for the...

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

Zinc dissolves in the solution

C

No reaction takes place

D

Mg is precipitated

Text Solution

Verified by Experts

The correct Answer is:
C
`E_(RP)^(@)` of `Mg lt E_(RP)^(@)` of Zn
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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 :

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