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JEE Main Chemistry में 90+ Percentile कैसे लाएँ? Smart Preparation Strategy

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  JEE Main Chemistry में 90+ Percentile कैसे लाएँ? Smart Preparation Strategy By PRIYANK JOSHI (PJ SIR) Chemistry Educator & JEE-NEET Mentor | Kota, India 18+ Years of Teaching Experience JEE Main की तैयारी करने वाले बहुत से Students का सवाल होता है — JEE Main Chemistry में 90+ Percentile कैसे लाएँ? कई Students Chemistry को कठिन मानते हैं, जबकि सही Concepts, NCERT, Previous Year Questions (PYQs) और नियमित Revision के माध्यम से Chemistry को एक मजबूत Scoring Subject बनाया जा सकता है। लेकिन केवल लंबे समय तक पढ़ना पर्याप्त नहीं है। जरूरी है कि Students सही Chapters, सही Practice और अपनी गलतियों के Analysis पर ध्यान दें। मैं, Priyank Joshi (PJ Sir) , अपने 18+ वर्षों के Chemistry Teaching Experience के आधार पर इस Article में ऐसी Practical Preparation Strategy साझा कर रहा हूँ, जो Class 11, Class 12 और JEE Main Aspirants के लिए उपयोगी हो सकती है। 1. JEE Main Chemistry का Exam Pattern समझें तैयारी शुरू करने से पहले Exam Pattern समझना आवश्यक है। JEE Main 2026 के Paper 1 में Chemistry Sec...
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NEET Chemistry की तैयारी कैसे करें? Class 11–12 Complete Guide

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  NEET Chemistry की तैयारी कैसे करें? Class 11 और 12 के Students के लिए Complete Guide By Priyank Joshi (PJ Sir) | Chemistry Educator & NEET Mentor, Kota | 18+ Years of Teaching Experience NEET की तैयारी करने वाले बहुत से Students के मन में एक सवाल रहता है— Chemistry में अच्छे Marks कैसे लाएँ? कई Students घंटों पढ़ाई करते हैं, Notes बनाते हैं, Lectures देखते हैं और Questions भी Solve करते हैं, लेकिन Test में अपेक्षित Marks नहीं आते। इसका कारण हमेशा मेहनत की कमी नहीं होता। कई बार सही Study Strategy, Conceptual Clarity, Revision और Question Practice की कमी होती है। अपने 18+ वर्षों के Teaching Experience के आधार पर मैं यह कह सकता हूँ कि Chemistry में बेहतर Performance के लिए केवल याद करना पर्याप्त नहीं है। Concepts समझना, उन्हें Questions में Apply करना और नियमित Revision करना भी जरूरी है। आइए समझते हैं कि Class 11 और 12 के Students NEET Chemistry की तैयारी कैसे बेहतर बना सकते हैं। 1. NEET Chemistry को तीन हिस्सों में समझें Chemistry मुख्य रूप से तीन भागों में पढ़ी जाती है: Physic...
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Class 9 Science Chapter 8 Journey Inside the Atom – NCERT Solutions & Easy Notes Part 4 | PJ Sir

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  Class 9 Science Chapter 8 Journey Inside the Atom – NCERT Solutions & Easy Notes Part 4 | PJ Sir Part 4: Isotopes, Isobars & Average Atomic Mass Part 1 me humne Dalton, Thomson aur Rutherford ke atomic models samjhe. Part 2 me Bohr Model, electron, proton, neutron, atomic number aur mass number padha. Part 3 me electronic configuration, 2n² rule, valence electrons, octet aur valency samjhi. Ab Chapter 8 ke final part me hum padhenge: Isotopes Isobars Average Atomic Mass Important Numericals Complete Chapter Revision 1. What Are Isotopes? Hum jaante hain: Atomic Number (Z) = Number of Protons Aur: Mass Number (A) = Number of Protons + Number of Neutrons Kabhi-kabhi same element ke atoms me protons ki sankhya same hoti hai, lekin neutrons ki sankhya different hoti hai. Aise atoms ko Isotopes kehte hain. Definition of Isotopes Atoms of the same element having the same atomic number but different mass numbers are called isotopes. In simple words: Same Element Same Atomic Num...
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Class 9 Science Chapter 8 Journey Inside the Atom – NCERT Solutions & Easy Notes Part 3 | PJ Sir

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  Class 9 Science Chapter 8 Journey Inside the Atom – NCERT Solutions & Easy Notes Part 3 | PJ Sir Part 3: Electronic Configuration & Valency Made Easy Part 1 me humne Dalton, Thomson aur Rutherford ke atomic models ko samjha. Part 2 me humne Bohr Model, subatomic particles, atomic number aur mass number padha. Ab ek important question: Atom me electrons different shells me arrange kaise hote hain? Aur kisi atom ki valency kaise pata lagti hai? Part 3 me hum Electronic Configuration, 2n² Rule, Valence Electrons, Octet aur Valency ko easy way me samjhenge. 1. Distribution of Electrons in Different Energy Levels Bohr Model ke according electrons nucleus ke around different energy levels or shells me present hote hain. These shells are represented as: K, L, M, N... or n = 1, 2, 3, 4... Electrons ko shells me arrange karne ke liye Bohr and Bury ne kuch rules suggest kiye. 2. The 2n² Rule Kisi shell me maximum kitne electrons aa sakte hain, ise calculate karne ka formula hai: ...
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Class 9 Science Chapter 8 Journey Inside the Atom – NCERT Solutions & Easy Notes Part 2 | PJ Sir

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Class 9 Science Chapter 8 Journey Inside the Atom – NCERT Solutions & Easy Notes Part 2 | PJ Sir Part 2: Inside the Atom – Bohr Model, Subatomic Particles, Atomic Number & Mass Number Part 1 me humne atomic models ki journey samjhi — Dalton se Thomson aur Rutherford tak. Rutherford ne bataya ki atom ke centre me ek very small, dense and positively charged nucleus hota hai aur atom ka most part empty space hota hai. Lekin Rutherford ka model ek important question ka answer nahi de paya: Electrons nucleus me girte kyon nahi hain? Isi problem ko samjhane ke liye Niels Bohr ne atom ka ek improved model propose kiya. 1. Bohr’s Model of the Atom In 1913 , Niels Bohr proposed a new model to explain the stability of atoms. According to Bohr: Electrons nucleus ke around randomly move nahi karte. They move only in certain fixed circular paths . These fixed paths are called: Stationary States Orbits Shells Each shell has a definite amount of energy, so these shells are also called: Energ...
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Class 9 Science Chapter 8 Journey Inside the Atom – NCERT Solutions & Easy Notes Part 1 | PJ Sir

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  Class 9 Science Chapter 8 Journey Inside the Atom – NCERT Solutions & Easy Notes Part 1 | PJ Sir Part 1: Journey of Atomic Models – From Dalton to Rutherford Atoms are the building blocks of matter. Everything around us—living as well as non-living—is ultimately made up of atoms. But scientists did not always know what was present inside an atom. For a long time, atoms were considered indivisible. As experiments improved, scientists discovered electrons and the nucleus, and the model of the atom changed step by step. In Part 1, we will understand this fascinating journey in simple language. 1. Early Idea of the Atom The idea that matter is made of extremely small particles is more than 2,000 years old. Acharya Kanada Ancient Indian thinker Acharya Kanada suggested that if matter or dravya is divided repeatedly, eventually we reach particles that cannot be divided further. He called these smallest particles parmanus . His ideas are recorded in the Vaisesika Sutras . Accordin...
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Class 9 Science Chapter 9 Atomic Foundations of Matter – NCERT Solutions & Easy Notes Part 4 | PJ Sir

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  Class 9 Science Chapter 9 Atomic Foundations of Matter – NCERT Solutions & Easy Notes Part 4 | PJ Sir Exploration – Grade 9 Science | Chapter 9 Part 4: Properties of Ionic & Covalent Compounds, Molecular Mass & Formula Unit Mass By Priyank Joshi (PJ Sir) Chemistry Educator & Mentor | 18+ Years of Teaching Experience In Part 1, we learnt the Laws of Chemical Combination and Dalton’s Atomic Theory . In Part 2, we understood Covalent and Ionic Bonding . In Part 3, we learnt Ions, Valency, Polyatomic Ions and Writing Chemical Formulae . Now, in the final part of Chapter 9, we will understand: Properties of Ionic & Covalent Compounds Solubility Electrical Conductivity Melting & Boiling Points Molecular Mass Formula Unit Mass Important Numericals 1. Properties of Ionic and Covalent Compounds Ionic and covalent compounds are formed differently, so their properties are also different. The chapter compares substances such as sodium chloride, copper sulfate, sugar, ...
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