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Consider the following concentration cel...

Consider the following concentration cell`:`
`Zn(s)|Zn^(2+)(0.024M)||Zn^(2+)(0.480M)|Zn(s)`
which of the following statements is `//` are correct?

A

The `EMF` of the cell at `25^(@)C` is nearly `+0.039V.`

B

The `EMF` of the cell at `25^(@)C` is nearly `-0.039V`.

C

If water is added in `LHE`, so that the `[Zn^(2+)]` is reduced to `0.012 M`, the cell voltage increases.

D

If water is added in `LH` , so that the `[Zn^(2+)]` is reduced to `0.012M` , the cell voltage decreases.

Text Solution

Verified by Experts

The correct Answer is:
a,c
Cell reaction `:Zn^(2+)(0.484M) rarr Zn^(2+)(0.024M)`
`E_(cell)=0-(0.059)/(2) log ((0.024)/(0.480))=0.039V`
For `:Zn^(2+)(0.484M)rarr Zn^(2+)(0.12M)`
`implies E_(cell)=0-(0.059)/(2) log ((0.012)/(0.48))`
`=0.03(1.6)=0.048V`
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Knowledge Check

  • In a concentration cell, Zn|Zn^(2+) (0.1M) || Zn^(2+) (0.15M) | Zn , as the cell discharges:

    A
    reaction proceeds to the right
    B
    the two solutions approach each other in concentration.
    C
    no reaction takes place
    D
    water gets decomposed.

  • Cell reaction for the cell Zn|Zn^(2+)(1.0M)||Cd^(2+)(1.0M)|Cd is given by

    A
    `CdrarrCd^(2+)+2e^(-)`
    B
    `Zn^(2+)rarrZn-2e^(-)`
    C
    `Cd+Zn^(2+)rarrZn+Cd^(2+)`
    D
    `Zn+Cd^(2+)rarrZn^(2+)+Cd`.

  • The value of reaction quotient Q for the cell Zn(s)|Zn^(2+)(0.01M)||Ag^(o+)(1.25M)|Ag(s) is

    A
    156
    B
    125
    C
    1.25xx10^(-2)
    D
    64xx10^(-3)
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