Assertion: The emf of a cell is related with equilibrium constant of the cell reaction as `E_(cell)=(0.0591)/(n)log" "K`.
Reason: As `E_(cell)` changes with concentration of the electrodes, K of cell reaction also changes with concentration.

Options

A. If both assertion and reason are true, and reason is the true explanation of the assertion
B. if both assertion and reason are true, but reason is not the true explanation of the assertion.
C. if assertion is true, but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided, and determine their validity.

### Step 1: Understanding the Assertion
The assertion states that the emf (electromotive force) of a cell is related to the equilibrium constant (K) of the cell reaction by the equation:
\[ E_{\text{cell}} = \frac{0.0591}{n} \log K \]
This equation is derived from the Nernst equation, which relates the cell potential to the concentrations of the reactants and products at non-standard conditions. The relationship indicates that the emf of the cell can be calculated if the equilibrium constant is known, and vice versa.

### Step 2: Analyzing the Reason
The reason states that as \(E_{\text{cell}}\) changes with the concentration of the electrodes, the equilibrium constant \(K\) of the cell reaction also changes with concentration. However, this statement is misleading. The equilibrium constant \(K\) is a function of temperature and does not change with the concentration of reactants or products at a given temperature. It is only the reaction quotient \(Q\) that changes with concentration, and it is \(Q\) that relates to \(E_{\text{cell}}\) through the Nernst equation.

### Step 3: Conclusion
Based on the analysis:
- The assertion is **true** because it correctly states the relationship between \(E_{\text{cell}}\) and \(K\).
- The reason is **false** because it incorrectly states that \(K\) changes with concentration.

### Final Answer
Thus, the correct conclusion is:
- Assertion: True
- Reason: False