Chemical Reactions and Equations
Complete Hinglish Notes, Board Derivations & NEET Booster
1. Concept Notes (Hinglish)
Chemical Reaction kya hota hai?
Jab ek ya ek se zyada substances (Reactants) aapas mein react karke ek naya substance (Product) banate hain jinki properties bilkul alag hoti hain, use Chemical Reaction kehte hain.
Key Observation: Reaction hone par ye 4 cheezein dekhne ko mil sakti hain:
- Change in State (Solid/Liquid/Gas)
- Change in Color
- Evolution of Gas (e.g., $H_2$ gas nikalna)
- Change in Temperature (Exothermic / Endothermic)
2. Quick Formula & Key Reactions Sheet
Combination Reaction
$$CaO + H_2O \rightarrow Ca(OH)_2 + Heat$$
Quicklime + Water = Slaked Lime (Exothermic)
Decomposition Reaction
$$2FeSO_4 \xrightarrow{\Delta} Fe_2O_3 + SO_2 + SO_3$$
Green crystal turns brown (Thermal Decomposition)
3. NEET & Board Practice Quiz
+4 / -1 PatternQ1. Jab Magnesium ribbon ko air me jalaya jata hai, toh white powder banta hai. Wo powder chemically kya hai?