Strategies for solving questions related to stoichiometry and mole concept in the chemistry section of the JEE Main exam:

1. Understand the Concept:
Before attempting any question related to stoichiometry and the mole concept, it is essential to have a clear understanding of the concepts involved. Familiarize yourself with the definitions, formulas, and equations related to stoichiometry, such as the law of conservation of mass, Avogadro's number, and mole ratio.

2. Balance Chemical Equations:
One of the key aspects of stoichiometry is balancing chemical equations. Practice balancing equations to ensure that the number of atoms on both sides of the equation is equal. This helps in determining the stoichiometric ratios and the number of moles involved.

3. Convert Given Information:
While solving stoichiometry problems, it is crucial to convert given information, such as mass, volume, or number of particles, into moles. Use conversion factors based on Avogadro's number and molar mass to convert between different units.

4. Determine the Stoichiometric Ratio:
The stoichiometric ratio can be determined by analyzing the balanced chemical equation. Identify the mole ratio between the given reactant and the desired product. This ratio is crucial for solving stoichiometry problems.

5. Use the Mole-Mole Conversion:
Once the stoichiometric ratio is determined, use the mole-mole conversion to calculate the number of moles of the desired product or reactant. Multiply the given moles of the reactant by the mole ratio to find the moles of the product, or vice versa.

6. Apply the Concept of Limiting Reactant:
In some stoichiometry problems, there may be an excess of one reactant. In such cases, determine the limiting reactant, which is the reactant that is completely consumed, and calculate the amount of product formed using the mole ratio of the limiting reactant.

7. Practice Sample Problems:
To enhance your problem-solving skills, practice solving sample problems related to stoichiometry and the mole concept. Solve a variety of problems involving different scenarios, such as reactions involving gases, solutions, or solids.

8. Review Common Mistakes:
Be aware of common mistakes made while solving stoichiometry problems, such as incorrect balancing of equations, wrong conversion factors, or misinterpretation of the given information. Review your solutions carefully to avoid these errors.

9. Time Management:
During the JEE Main exam, time management is crucial. Allocate an appropriate amount of time to solve stoichiometry and mole concept questions based on their difficulty level. If a question seems too time-consuming, move on to the next one and come back to it later if time permits.

10. Revise and Clarify Doubts:
Regularly revise the concepts of stoichiometry and the mole concept to strengthen your understanding. If you encounter any doubts or difficulties, consult your textbooks, reference materials, or discuss them with your teachers or peers to clarify any misconceptions.

By following these strategies, you can master the concepts of stoichiometry and the mole concept in chemistry and increase your chances of performing well in the JEE Main exam.