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Which of the following changes will incr...

Which of the following changes will increase the `EMF` of the cell `:`
`Co(s)|CoCl_(2)(M_(2))||HCl(M_(2))||(H_(2),g)Pt`

A

Increase the volume of `CoCl_(2)` from `100mL` to `200mL`

B

Increase `M_(2)` from `0.1 M` to `0.50M`.

C

Increase the pressure of the `H_(2)(g)` from `1.0` to `2.0 atm`.

D

Increase `M_(1)` from `0.01M` to `0.50M`.

Text Solution

Verified by Experts

The correct Answer is:
a,b
Cell reaction `:` `Co(s)+2H^(o+)(M_(2))rarrCo^(2+)(M_(1))+H_(2)(g)`
`E_(cell)=E^(c-)._(cell)_-(0.059)/(2)log.([Co^(2+)])/([H^(o+)])(p_(H_(2))-=Q_(cell))`
`a.` Increase in the volume `(i.e.,` dilution `)` of `CoCl_(2)` solution `(i.e.,` decrease in `[Co^(2+)])` will cause `Q_(cell)` to decrease causing `E_(cell)` to increase.
`b.` Increaseing `M_(2)` will cause a reduction in `Q` thus increasing `E_(cell)`
`c.` Increasing `p_(H_(2))` will increase `Q` thus reducing `E_(cell)`.
`d.` Increasing `M_(1)` will increase `Q` thus reducting `E_(cell)`.
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