Assertion-Reason Based Questions in the NEET Chemistry Section

Introduction
The National Eligibility cum Entrance Test (NEET) is a competitive examination conducted in India for students aspiring to pursue medical and dental courses. The chemistry section of NEET includes various types of questions, including assertion-reason based questions. These questions assess the understanding and application of concepts by providing an assertion (a statement) and a reason (an explanation) for that statement. Let's look at some examples of assertion-reason based questions in the NEET chemistry section and discuss them in detail.

Example 1:
Assertion: The solubility of a gas decreases with an increase in temperature.
Reason: An increase in temperature leads to an increase in the kinetic energy of gas molecules.

Explanation:
- The assertion states that the solubility of a gas decreases with an increase in temperature.
- The reason provided for this assertion is that an increase in temperature leads to an increase in the kinetic energy of gas molecules.

Analysis:
- The assertion is correct because the solubility of a gas in a liquid is primarily governed by the solute-solvent interactions.
- An increase in temperature increases the kinetic energy of gas molecules, which weakens these interactions and reduces the solubility.
- This phenomenon is explained by the Le Chatelier's principle, which states that an increase in temperature favors an endothermic process, such as the escape of gas molecules from the liquid phase.

Example 2:
Assertion: An electrolytic cell does not obey Ohm's law.
Reason: In an electrolytic cell, the current is carried by the movement of ions.

Explanation:
- The assertion states that an electrolytic cell does not obey Ohm's law.
- The reason provided for this assertion is that in an electrolytic cell, the current is carried by the movement of ions.

Analysis:
- The assertion is correct because Ohm's law, which relates current, voltage, and resistance, is not applicable to electrolytic cells.
- In an electrolytic cell, the movement of ions (charged particles) through the electrolyte solution is responsible for the flow of current.
- Unlike metallic conductors, where the current is carried by the movement of electrons, electrolytic cells involve the migration of ions under the influence of an electric field.
- The resistance in an electrolytic cell is mainly determined by the ionic conductivity of the electrolyte and the electrode-electrolyte interface properties.

Conclusion
Assertion-reason based questions in the NEET chemistry section require students to evaluate the validity of a statement and its corresponding explanation. It tests their conceptual understanding and ability to apply the principles of chemistry. By practicing these types of questions, students can enhance their analytical skills and improve their performance in the NEET examination.