Question

_____________________ is always positive for a spontaneous chemical reaction.

• A. Standard voltaic potential
• B. Entropy
• C. Enthalpy
• D. Reaction rate

Answer 1

The correct option is A Standard voltaic potential

Using the equation, $\Delta G=-nF{E}_{cell}......\left(1\right)$ we can easily get the answer

Here, $\Delta G$ is the change in Gibbs free energy, $nF$ is the total charge transferred during the reaction, and $E_{cell}$ is the Standard electrode potential

Since, $\Delta G$ for a spontaneous reaction is always negative, and $n$ and $F$ are non-negative constants, we must have $E_{cell}>0$ for equation $\left(1\right)$ to be valid. Hence A is the correct answer