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When the total cell emf of a volatic cel...

When the total cell emf of a volatic cell is greater than zero, which of the following is true about the reaction quotient Q and free energy change `Delta G` for the cell reaction ?

A

Q is less than one and `Delta G` is greater than zero

B

Q is greater than one and `Delta G` is greater than zero

C

Q is less than one and `Delta G` is less than zero.

D

Q is greater than one and `Delta G` is less than zero

Text Solution

Verified by Experts

The correct Answer is:
D
`Delta G = Delta G^(@) + RT "In" Q`
`because Delta G^(@) = - nFE^(@)`
and `E^(@) gt 0`
`therefore Delta G^(@) lt 0`
or `Delta G - RT "In" Q lt 0`
It is possible when `Q gt 1, and Delta G lt 0`.
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