Physisorption and Chemisorption — Prelims Strategy

Prelims Strategy

To excel in NEET questions on physisorption and chemisorption, a clear conceptual understanding of their differences is paramount. Focus on creating a mental or written comparison table highlighting all key distinguishing features: nature of forces, enthalpy, reversibility, specificity, effect of temperature, layer formation, and activation energy.

For numerical problems (though rare), ensure you understand the units and magnitudes of enthalpy values. For conceptual questions, carefully read each option and eliminate distractors by recalling the specific properties of each adsorption type.

Pay close attention to keywords like 'reversible,' 'specific,' 'monolayer,' and 'activation energy.' A common trap is confusing the effect of temperature on the two types; remember physisorption decreases with temperature, while chemisorption often increases initially before decreasing.

Practice identifying the type of adsorption from a given set of characteristics or an application scenario. Regularly revise the key differences to ensure quick and accurate recall during the exam.