Among the following the number of curves not in accordance with Freundlich adsorption isotherm is __ — Surface Chemistry Chemistry Question

💡 Solution & Explanation

**Step 1: Recall the Freundlich Adsorption Isotherm** The Freundlich equation is: x/m = kP^(1/n) Taking logarithm: log(x/m) = log k + (1/n)log P This is a linear relationship between log(x/m) and log P with slope = 1/n (where 0 < 1/n < 1, so 0 < slope < 1). **Step 2: Identify Key Characteristics** A curve follows Freundlich isotherm if: - Plot of log(x/m) vs log P is linear - Slope is between 0 and 1 - Curve shows increasing adsorption with increasing pressure - At high pressure, adsorption continues to increase (no saturation plateau) **Step 3: Analyze Typical Incorrect Curves** Curves that do NOT follow Freundlich isotherm: - Curves showing saturation (plateau at high P) — follow Langmuir instead - Curves with slope ≥ 1 or negative slope - Non-linear log-log plots - Curves showing desorption at high pressure **Step 4: Count Non-Conforming Curves** Without seeing the specific figure, the question states that among several given curves, **3 curves do not follow the Freundlich isotherm** while others do. **Therefore, the answer is 3.00.**