Question

During the working of a galvanic cell and with the passage of time:

• A. spontaneity of the cell reaction decreases, $E_{cell}$ decreases
• B. reaction quotient Q decreases, $E_{cell}$ increases
• C. reaction quotient Q increases, $E_{cell}$ decreases
• D. at equilibrium, $Q=K_{eq},E_{cell}=0$

Answer 1

Answer: (A), (C), (D)

spontaneity of the cell reaction decreases, $E_{cell}$ decreases
reaction quotient Q increases, $E_{cell}$ decreases
at equilibrium, $Q=K_{eq},E_{cell}=0$

During the working of a galvanic cell, it reaches equilibrium from its standard conditions.
$\Rightarrow Q\uparrow$ to reach $K_{eq};E_{cell}\downarrow$

$E_{cell}=E_{cell}^o-\frac{2.303\times RT}{n\times F}\times logQ$

Reaction becomes less spontaneous as $E_{cell}\downarrow$.

At equilibrium, $E_{cell}=0$ and $Q=K_{eq}$

So, options A, C and D are correct.