NTA will shortly release the JEE Main Syllabus 2025 at jeemain.nta.ac.in. Last Year, the complete syllabus of JEE Main underwent some major changes. According to the latest syllabus guidelines, the weightage of Physics has dropped to 22.5%. Due to these changes in the syllabus, certain shifts in chapter-wise weightage have been observed. Solutions are among such topics. It’s among the least weightage topics in JEE Main Physics Syllabus 2025. This chapter holds 1.39% weightage in the whole syllabus.

• Solutions is a part of the General Physics section, and every year around 2-3 questions are asked from this chapter. Due to the drop in weightage, you can expect 1-2 questions in JEE Main 2025.
• Solutions in JEE Mains Physics Syllabus 2025 covers all the basic concepts on units and measurements, fundamentals of units, dimensions etc.

Aspirants consider Solutions as one of the Easiest Chapters in Physics for JEE Main 2025. Even though this chapter has the least weightage in the syllabus, to develop a strong foundation in physics, this particular chapter plays a pivotal role. Hence the candidates need to develop a clear understanding of this chapter. The list of most asked questions from this chapter will help the students with their preparation.

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Here are some common topics and questions in JEE solutions chemistry:

• Chemical equilibrium
• Understanding how reactions reach equilibrium between reactants and products is important.
• Colligative properties
• Properties like vapor pressure lowering and osmotic pressure are important for solving problems related to ideal and non-ideal solutions.
• Raoult's Law
• This law governs the behavior of ideal solutions and is often tested in JEE Main.
• Molality and molarity
• These are fundamental concentration units that are important for understanding solution chemistry.
• Solubility
• Solubility is influenced by temperature, pressure, and the nature of the solute and solvent.
• Liquid solutions
• This topic includes concepts like gas in liquid, liquid in liquid, and solid in liquid.
• Molarity
• This is a measure of the concentration of a solute in a solution. It's important for preparing and diluting solutions, and calculating the quantities of substances involved in reactions.

Some strategies for solving JEE questions include:

• Answer choice elimination
• Systematically eliminate answer choices to narrow down the options and improve your chances of selecting the correct answer.
• Focus on all three subjects
• Chemistry is often neglected by JEE aspirants, but it's important to focus on all three subjects equally to obtain a good JEE rank.

Solutions JEE Mains Questions -

List Of Most Asked Questions With Solutions

In the (JEE) Main, the topic of Solutions often features questions that have appeared multiple times in previous years. Many questions in this section are either repeated or follow similar patterns, with only minor changes, such as different numerical values or slight modifications in wording.Certain questions have been repeated as many as five times.

Here are some of the most frequently asked and repeated questions:

Here are 10 multiple-choice questions on "Solutions" for JEE Mains along with their solutions and the years they appeared in the exam:

1. The Van't Hoff factor (i) for a dilute solution of K2SO4 in water is close to:
   • A) 1
   • B) 2
   • C) 3
   • D) 4
   • The correct answer is C) 3. K2SO4 dissociates into 2K+ and SO4^2- ions, giving a Van't Hoff factor of 3.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
2. The freezing point depression constant (Kf) depends on:
   • A) Nature of solute
   • B) Nature of solvent
   • C) Volume of solution
   • D) Temperature
   • The correct answer is B) Nature of solvent. Kf is a characteristic property of the solvent.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
3. A 0.1 molal aqueous solution of a weak acid (HX) is 30% ionized. The freezing point of the solution will be (Kf = 1.86°C/m):
   • A) -0.186°C
   • B) -0.372°C
   • C) -0.558°C
   • D) -0.744°C
   • The correct answer is C) -0.558°C. Considering the degree of ionization and molality, the freezing point depression can be calculated.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
4. Which of the following mixtures forms an ideal solution?
   • A) Benzene and toluene
   • B) Ethanol and water
   • C) Acetone and chloroform
   • D) Hexane and ethanol
   • The correct answer is A) Benzene and toluene. These two components form an ideal solution due to similar intermolecular forces.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
5. Which colligative property is best used to determine molar mass of a polymer?
   • A) Freezing point depression
   • B) Boiling point elevation
   • C) Osmotic pressure
   • D) Vapour pressure lowering
   • The correct answer is C) Osmotic pressure. Osmotic pressure measurements are ideal for high molecular weight compounds like polymers.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
6. The solubility of a gas in a liquid decreases with:
   • A) Increase in pressure
   • B) Increase in temperature
   • C) Increase in gas volume
   • D) Increase in liquid density
   • The correct answer is B) Increase in temperature. Solubility of gases in liquids generally decreases with an increase in temperature.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
7. A solution of urea is isotonic with 10% (w/v) glucose solution. The molecular weight of urea is:
   • A) 180
   • B) 60
   • C) 120
   • D) 240
   • The correct answer is B) 60. The molecular weight of urea can be calculated using isotonic solutions and the concept of molarity.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
8. Raoult's law is applicable to:
   • A) Ideal solutions
   • B) Colloidal solutions
   • C) Non-ideal solutions
   • D) Supersaturated solutions
   • The correct answer is A) Ideal solutions. Raoult’s law applies only to ideal solutions where the intermolecular forces between solute and solvent are similar.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
9. What is the molality of a solution containing 10 g of NaOH in 500 g of water?
   • A) 0.5 m
   • B) 0.25 m
   • C) 1.0 m
   • D) 2.0 m
   • The correct answer is A) 0.5 m. Molality is calculated using the mass of the solute and the mass of the solvent in kilograms.
   • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)
10. The van’t Hoff factor for NaCl in an aqueous solution is approximately:
    • A) 1
    • B) 2
    • C) 3
    • D) 4
    • The correct answer is B) 2. NaCl dissociates into Na+ and Cl- ions in solution, giving a Van't Hoff factor of 2.
    • (This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024)