NEET Exam > NEET Notes > Short Notes > Short Notes: Solutions
Short Notes: Solutions
Types of Solutions
| Solute State | Solvent State | Example |
|---|---|---|
| Gas | Gas | Air |
| Gas | Liquid | O2 in water |
| Liquid | Liquid | Ethanol in water |
| Solid | Liquid | NaCl in water |
| Solid | Solid | Alloys (brass) |
Concentration Terms
| Term | Formula | Unit |
|---|---|---|
| Mass Percentage | (Mass of solute / Mass of solution) × 100 | % |
| Volume Percentage | (Volume of solute / Volume of solution) × 100 | % |
| Molarity (M) | Moles of solute / Volume of solution (L) | mol/L |
| Molality (m) | Moles of solute / Mass of solvent (kg) | mol/kg |
| Mole Fraction (X) | Moles of component / Total moles | Unitless |
| ppm | (Mass of solute / Mass of solution) × 106 | ppm |
Solubility
- Henry's Law: p = KH × X (pressure = Henry's constant × mole fraction)
- Higher KH → Lower solubility
- Applications: Scuba diving, soft drinks, blood oxygen
Raoult's Law
- For volatile solute: Ptotal = PA0XA + PB0XB
- For non-volatile solute: P = PA0XA
- Relative lowering of vapor pressure: (P0 - P) / P0 = Xsolute = (n / n + N)
Colligative Properties
| Property | Formula | Key Points |
|---|---|---|
| Relative Lowering of Vapor Pressure | (P0 - P) / P0 = Xsolute | Depends only on mole fraction |
| Elevation in Boiling Point | ΔTb = Kb × m | Kb = molal elevation constant |
| Depression in Freezing Point | ΔTf = Kf × m | Kf = molal depression constant |
| Osmotic Pressure | π = CRT (or π = (n/V)RT) | C = molarity, R = 0.0821, T in Kelvin |
Important Formulas for Molar Mass
- From ΔTf: M = (Kf × wsolute × 1000) / (ΔTf × Wsolvent)
- From π: M = (w × R × T) / (π × V)
Abnormal Molar Mass
- Van't Hoff Factor (i) = Normal molar mass / Abnormal molar mass
- i = Observed colligative property / Calculated colligative property
- Association: i < 1 (e.g., acetic acid in benzene)
- Dissociation: i > 1 (e.g., NaCl in water)
- Modified formulas: ΔTf = i × Kf × m; π = i × CRT
NEET Focus:
- Molarity vs Molality difference
- Numerical problems on colligative properties
- Van't Hoff factor calculations
- Henry's law applications
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FAQs on Short Notes: Solutions
| 1. What is the NEET exam? |  |
Ans. The NEET (National Eligibility cum Entrance Test) is a national-level entrance examination in India for students aspiring to study undergraduate medical courses like MBBS and BDS. It assesses students' knowledge in subjects such as Physics, Chemistry, and Biology.
| 2. What subjects are included in the NEET syllabus? | |
Ans. The NEET syllabus includes three main subjects: Physics, Chemistry, and Biology. The topics covered in these subjects are based on the NCERT curriculum for classes 11 and 12, ensuring a comprehensive understanding of the foundational concepts necessary for medical studies.
| 3. How is the NEET exam structured? | |
Ans. The NEET exam consists of 180 multiple-choice questions, with 45 questions each from Physics and Chemistry, and 90 questions from Biology. The exam is conducted in a pen-and-paper format, with each correct answer awarding four marks, while one mark is deducted for each incorrect answer.
| 4. What is the eligibility criteria for appearing in NEET? | |
Ans. To be eligible for NEET, candidates must be at least 17 years old and should have completed their Class 12 education with Physics, Chemistry, and Biology as core subjects. Additionally, candidates must secure a minimum percentage in these subjects, as specified by the examination authority.
| 5. What is the significance of NEET for medical aspirants? | |
Ans. NEET is crucial for medical aspirants as it serves as a common entrance test for admission to various medical colleges across India. It provides a fair opportunity for students from different educational backgrounds to compete for a limited number of seats in prestigious medical institutions.
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