Question

Which of the following statements is not correct ?

• A. \(\Delta G^{\circ}\) is an extensive property.
• B. \(E^{\circ}\) cell is an intensive property.
• C. For a chemical reaction to be spontaneous \(\Delta G\) must be \(-\text{ve}\).
• D. Electrical work is equal to \(\Delta G\)

Hint:

Gibbs energy depends on the amount of substance, while cell potential does not. Electrical work equals minus delta G.

Answer 1

The Correct Option is D

Step 1: Test each statement
Take (A): $\Delta G^{\circ}$ scales with moles, so extensive, true. Take (B): $E^{\circ}$ is a potential per unit charge, so intensive, true. Take (C): spontaneity needs $\Delta G < 0$, true.

Step 2: Statement D
The electrical work obtained from a cell is $-\Delta G = nFE$. Equating electrical work to $\Delta G$ without the minus sign is wrong.

Step 3: Answer
The incorrect statement is (D).

Final Answer:
The incorrect statement is D. \[ \boxed{\text{(D)}\ D} \]