d and f block | Extra Practice Question (EPQ)

🔥 Welcome to the real, unfiltered JEE grind at @RCaspirants! I’m a JEE Dropper, and this is my raw revision session using the Feynman Technique—because the best way to lock a concept in your brain is to teach it! 🧠💪 In this d and f block series, we are tearing down the chapter from zero to straight-up JEE Advanced level. No fluff, just pure concepts, important exceptions, and those hidden tricks that we always forget in the exam hall.... ⏳ Save Your Time! Jump straight to your weak topics... ​[00:00] - The 513K Heating Trap: KMnO_4 ko 513K par heat karne par K_2MnO_4 banta hai, jo ki green colour ka hota hai aur usme 1 unpaired electron hone ke karan wo paramagnetic hota hai. ​[01:05] - Iodide Oxidation Medium Trap: KMnO_4 acidic medium mein I^- ko I_2 mein oxidize karta hai, lekin neutral/faintly alkaline medium mein wo I^- ko IO_3^- (Iodate) mein oxidize karta hai. Yeh difference Advanced ka favourite trap hai. ​[01:40] - K_2MnO_4 Properties: It is prepared from Pyrolusite (MnO_2) + KOH + O_2. It is tetrahedral, green, and the \pi-bonding is between the p-orbital of Oxygen and the d-orbital of Manganese (not 2p-3p \pi bond). ​[03:30] - The HCl Trap: Kyun HCl ko acidic medium ke liye use nahi karte? Kyunki KMnO_4 usko Cl_2 mein oxidize kar deta hai. Isliye H_2SO_4 best hai. ​[07:50] - Increasing KMnO_4 Yield: 3MnO_4^{2-} + 2H_2O \rightleftharpoons 2MnO_4^- + MnO_2 + 4OH^-. Is reaction ko aage (forward) badhane ke liye CO_2 add karte hain jo OH^- ko remove karke carbonate bana leta hai, driving the reaction to completion according to Le Chatelier's principle. ​[10:05] - Titration with FAS (Mohr's Salt): Dilute H_2SO_4 is used. HNO_3 cannot be used because it is an oxidizing agent and will independently oxidize Fe^{+2} to Fe^{+3}, ruining the titration reading. ​[12:10] - Auto-catalysis Trap: Oxalic acid aur KMnO_4 ki reaction shuru mein slow hoti hai, par baad mein fast ho jati hai kyunki jo product banta hai, Mn^{+2}, wo khud ek auto-catalyst ki tarah kaam karne lagta hai. Targeting IIT/NIT/AIIMS? You are not alone. If you are grinding day and night in your drop year or Class 11/12, hit SUBSCRIBE and let's crack this together! Drop your doubts in the comments, and let's discuss. Keep grinding, stay focused! 🎯 #dblock #ChemicalBonding #JEEDropper #IITJEE #RCaspirants #JEE2027 #NEET2027 #ChemistryRevision #StudyVlog #DropperToTopper #Class11Chemistry #JEEMains #JEEAdvanced #InorganicChemistry #IITMotivation #FeynmanTechnique