Judna Aur Tootna 🔗
Reactions ko unke "pattern" ke hisaab se types mein baanta jaata hai - isse pehchaanna aasaan ho jaata hai aur board mein seedhe marks milte hain. Do sabse basic types hain: combination (sanyojan) (judna) aur decomposition (viyojan) (tootna) - ye ek doosre ke bilkul ulte hain.
➕ Combination Reaction (Combination)
📌 Jab do ya zyada padarth milkar ek hi naya padarth banate hain.
Pattern: A + B → AB
Mistri deewar par safedi (whitewash) karne se pehle bujha hua chuna banata hai - wo quicklime (CaO) ko paani mein daalta hai, aur bartan garam ho jaata hai, chhal-chhal ki aawaz aati hai! Ye combination reaction (abhikriya) hai. Phir deewar par laga hua ye chuna hawa ki CO₂ se milkar dheere-dheere calcium carbonate (wahi cheez jisse sangmarmar bana hai) ban jaata hai - isiliye 2-3 din baad deewar chamakne lagti hai!
✔ Combination ke examples
1. Bujha chuna banna (exothermic bhi):
CaO(s) + H₂O(l) → Ca(OH)₂(aq) + garmi
2. Magnesium jalna:
2Mg(s) + O₂(g) → 2MgO(s)
3. Coal jalna:
C(s) + O₂(g) → CO₂(g)
4. Safedi chamakna (deewar par):
Ca(OH)₂(aq) + CO₂(g) → CaCO₃(s) + H₂O(l)
➖ Decomposition Reaction (Decomposition)
📌 Jab ek hi padarth toot kar do ya zyada naye padarth banata hai.
Pattern: AB → A + B
Todne ke liye energy chahiye hoti hai - isliye ye aksar endothermic hoti hain.
Energy kis roop mein di gayi, uske hisaab se decomposition ke 3 prakaar hain:
1️⃣ Thermal Decomposition (garmi se)
Chuna patthar se chuna banana (cement udyog)
CaCO₃(s) —Δ→ CaO(s) + CO₂(g)
(Δ ka matlab hai "garam karna")
Ferrous sulphate garam karna - hare crystals bhoore ho jaate hain aur jalne wali gandh aati hai:
2FeSO₄(s) —Δ→ Fe₂O₃(s) + SO₂(g) + SO₃(g)
2️⃣ Electrolytic Decomposition (bijli se)
Paani ka vidyut apghatan
2H₂O(l) —bijli→ 2H₂(g) + O₂(g)
Dhyan do: hydrogen ki maatra oxygen se dugni banti hai - kyunki paani mein H aur O
ka anupat 2:1 hai. Prayog mein cathode wali test tube mein gas ka star hamesha dugna hota hai!
3️⃣ Photolytic Decomposition (roshni se)
Silver salts ka toot'na
2AgCl(s) —sooraj ki roshni→ 2Ag(s) + Cl₂(g) (safed se sleti/grey)
2AgBr(s) —roshni→ 2Ag(s) + Br₂(g)
Digital camera se pehle, black-and-white photography silver bromide par hi chalti thi! Film par lagi AgBr ki parat par jahan roshni padti, wahan wo tootkar kaala silver chhod deti - aur image ban jaati. Isi photolytic decomposition ne duniya ki pehli tasveerein banayi. Aaj bhi ye X-ray (kiran) films mein istemal hoti hai.
🔄 Dono Ka Muqabla
| Combination | Decomposition |
|---|---|
| A + B → AB (judna) | AB → A + B (tootna) |
| Products kam, reactants zyada | Reactant ek, products zyada |
| Aksar exothermic (garmi nikalti hai) | Aksar endothermic (garmi chahiye) |
| CaO + H₂O → Ca(OH)₂ | CaCO₃ → CaO + CO₂ |
Bharat duniya ka doosra sabse bada cement utpadak desh hai. Cement banane ka pehla aur sabse zaroori kadam hai chuna patthar (CaCO₃) ko bade bhattiyon mein ~1000°C par garam karna - yani thermal decomposition! Rajasthan, MP aur Andhra ke cement plants roz laakhon tan is ek reaction par chalte hain. Aapke ghar ki har deewar iss reaction ki den hai.
🧠 Apne Aap Ko Test Karo
🎯 Reaction ka type pehchaanne ki practice karo - game khelo!
Open Reaction Classifier →