Solutions Class 12 Chemistry Notes – Formulas & Quick Revision

Solutions Class 12 Physical Chemistry ka pehla chapter hai — concentration terms, Raoult law aur colligative properties yahan hain. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.

Important Formulas & Concepts — Solutions

• Raoult law: p = p°·x (volatile solvent)
• Relative lowering: (p° − p)/p° = x_solute
• Elevation in BP: ΔT_b = K_b·m
• Depression in FP: ΔT_f = K_f·m
• Osmotic pressure: π = CRT
• vant Hoff factor: i = observed/calculated colligative property
• With i: ΔT_f = i·K_f·m
• Henry law: p = K_H·x (gas solubility)

Quick Revision Points

• Colligative properties particles ki SANKHYA par depend karti hain, nature par nahi
• NaCl ka i ≈ 2, CaCl₂ ≈ 3 (dissociation)
• Acetic acid benzene mein dimerise → i < 1
• Positive deviation: A-B interaction weak (ethanol-acetone); negative: strong (HNO₃-water)
• Azeotropes distillation se separate nahi hote

FAQ

Colligative numericals ka pattern kya hai?

Molality/molarity nikaalo, formula lagao, i ka dhyan rakho — PDF mein 4 types ke solved patterns hain.

Molar mass determination kaise?

Colligative property se M nikalne ke rearranged formulas PDF sheet mein ready hain.

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