States of Matter: Gases and Liquids — Predicted 2026
AI-Predicted Question Angles for UPSC 2026
Combined Gas Law and Stoichiometry
highNEET often combines concepts. A question might involve a chemical reaction producing a gas, and then ask to calculate the volume, pressure, or temperature of that gas under new conditions using the combined gas law. This tests both stoichiometry and gas laws, requiring multiple steps and careful unit handling. For example, 'X grams of a reactant produces Y liters of gas at STP. What volume will it occupy at P and T?'
Comparative Analysis of Liquid Properties based on IMFs
highConceptual questions comparing the boiling points, vapor pressures, surface tensions, or viscosities of different substances based on their dominant intermolecular forces (London dispersion, dipole-dipole, hydrogen bonding) are very common. Students need to be able to identify the strongest IMF present and correlate it with the observed physical property. For instance, ranking a series of compounds by increasing boiling point.
Real Gas Behavior and van der Waals Equation Interpretation
mediumWhile direct calculations using the van der Waals equation might be too complex for NEET, conceptual questions about the significance of the 'a' and 'b' constants, the conditions under which Z < 1 or Z > 1, and the factors causing deviation from ideal behavior are highly probable. Understanding the physical meaning of these terms and their impact on gas properties is key.
Graphical Representation of Gas Laws
mediumQuestions involving graphs (e.g., P vs. V, V vs. T, PV vs. P) to represent Boyle's, Charles's, or ideal/real gas behavior are common. Students should be able to interpret these graphs, identify the gas law they represent, and understand how changes in conditions (like temperature for an isotherm) affect the graph's shape. For example, identifying which curve represents a higher temperature in a P-V graph.