Redox Reactions Class 11 Chemistry Notes – Formulas & Quick Revision

Redox Reactions mein oxidation number, balancing aur electrochemical basics aate hain — chhota par scoring chapter. 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 — Redox Reactions

• Oxidation = electron loss / ON badhna; Reduction = electron gain / ON ghatna
• ON rules: F hamesha −1; O usually −2 (peroxide −1, OF₂ +2); H usually +1 (hydride −1)
• Free element ka ON = 0; ion ka ON = charge
• Balancing: ion-electron (half-reaction) method — acidic mein H⁺/H₂O, basic mein OH⁻
• Disproportionation: same element oxidise + reduce dono (Cl₂ + NaOH)
• n-factor = electrons transferred per formula unit
• Equivalents = moles × n-factor
• Oxidising agent khud reduce hota hai; reducing agent khud oxidise

Quick Revision Points

• KMnO₄: acidic mein Mn +7→+2 (5e⁻), neutral mein +7→+4 (3e⁻)
• K₂Cr₂O₇: Cr +6→+3 (6e⁻ per formula)
• H₂O₂ oxidising aur reducing dono ho sakta hai
• Balancing mein pehle atoms, phir charge balance karo
• ON nikalna har chapter mein kaam aayega (p-block, electrochemistry)

FAQ

Balancing kaunse method se karu?

Ion-electron method sabse reliable hai — PDF mein steps ke saath solved examples hain.

Ye chapter kitna important hai?

Electrochemistry (Class 12) ka base hai + titration numericals mein n-factor use hota hai.

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