MHTCET 16 Apr 2026 Shift 2 Paper

Concept:In electrochemistry, Gibbs energy change and electrical work are related, but with opposite signs.Explanation:For an electrochemical cell, the relation is: $\Delta G = -nFE_{\text{cell}}$Here, $n$ is the number of electrons transferred, $F$ is Faraday's constant, and $E_{\text{cell}}$ is the cell potential.The electrical work done by the cell equals the decrease in Gibbs energy.So, electrical work done by the cell $= -\Delta G$Thus, electrical work is not equal to $\Delta G$ directly; it is equal to $-\Delta G$.Hence, Option D is incorrect.Now check the other statements:$\Delta G^\circ$ is an extensive property because it depends on the amount of substance.$E_{\text{cell}}^\circ$ is an intensive property because it does not depend on the amount of substance.For a spontaneous reaction, $\Delta G$ must be negative, i.e., $\Delta G < 0$.So, statements A, B, and C are correct.Answer:Option D — "Electrical work is equal to $\Delta G$" is the incorrect statement.