4AB › Blog
4AB Blog
1394 published articles across the 4AB Great Services websites: chemistry knowledge base, deities, coupons, web and more — grouped by website, newest first.
Calculator Knowledge Base
ABC Chemistry · 490 postsAll Calculator Knowledge Base posts →
EquilibriumAcid Strength Down a Group and Across a PeriodWhy HI is a stronger acid than HF: down a group bond enthalpy decides, across a period electronegativity does. Oxyacids, pKa tables, worked pH examples.18 Sep 2026 · 8 min read
ConceptsAdsorption in Water Purification — Freundlich and Langmuir Isotherms at WorkHow the Freundlich and Langmuir isotherms from your surface chemistry chapter are used to size activated carbon for water treatment. Four worked calculations including the log-log 23 Sep 2026 · 8 min read
ConceptsAllotropy — Carbon, Sulphur and Phosphorus ComparedAllotropy explained for Class 11-12: diamond vs graphite vs fullerene, rhombic and monoclinic sulphur, white red and black phosphorus, with molar mass and molar volume working and 26 Sep 2026 · 9 min read
ConceptsAlternate Routes After an Unsuccessful Attempt — A Chemistry Decision MapDid not clear CSIR-NET, GATE or IIT-JAM this cycle? A practical map of every route still open — reattempt, other qualifying exams, institute entrance tests…18 Sep 2026 · 8 min read
EquilibriumAmphoteric Substances — Acting as Both Acid and BaseAmphoteric and amphiprotic explained: water, ZnO, Al2O3 and Al(OH)3 equations both ways, the pH of NaHCO3 from pKa1 and pKa2, amino acid isoelectric points and the periodic trend i25 Sep 2026 · 7 min read
CareersAnalytical Chemistry as a Career Route — What the Work Actually InvolvesA practical look at analytical chemistry careers — instrumentation, method development, QC vs R&D analytical work, entry routes and the skills that actually get you hired.27 Sep 2026 · 7 min readGods & Deities Blog
Great Spiritual · 108 postsAll Gods & Deities Blog posts →
Blogहिंदू पर्व कैलेंडरसितंबर 2026 से सितंबर 2027 तक के सभी प्रमुख हिंदू पर्व, व्रत और त्योहारों की तिथि, वार, तिथि-पंचांग और आराध्य देव की पूरी सूची।14 Oct 2026 · 4 min read
देवी-देवतादेव अग्नि: यज्ञ के हव्यवाहन, खांडव-दहन की कथा और महत्वअग्नि — ऋग्वेद के प्रथम शब्द, देवताओं के मुख और यज्ञ के हव्यवाहन। स्वाहा-संबंध, खांडव-दहन कथा, अग्निहोत्र-परंपरा और मंत्रों का विस्तृत परिचय।14 Sep 2026 · 6 min read
पर्व एवं त्योहारअनंत चतुर्दशी 2026: तिथि, अनंत सूत्र पूजा और गणपति विसर्जनअनंत चतुर्दशी 2026 में 25 सितंबर को है। जानिए अनंत भगवान (विष्णु) की व्रत-कथा, चौदह गाँठ वाले अनंत-सूत्र की पूजा विधि और गणपति-विसर्जन के सुरक्षा-नियम।24 Sep 2026 · 6 min read
देवी-देवतामाता अन्नपूर्णा: काशी की अन्न-दात्री देवी और अन्नकूट पर्वअन्नपूर्णा देवी अन्न और पोषण की अधिष्ठात्री मानी जाती हैं, विशेष रूप से काशी में पूजित। जानिए उनकी कथा, अन्नकूट पर्व, प्रतीकात्मक अर्थ और उपासना परंपरा।24 Sep 2026 · 6 min read
देवी-देवताअर्धनारीश्वर: शिव-शक्ति का एक-देह स्वरूप, कथा और आध्यात्मिक अर्थअर्धनारीश्वर — आधे शिव आधी पार्वती का दिव्य स्वरूप। भृंगी-कथा, एलिफेंटा-शिल्प, तिरुचेंगोडे पीठ और इस विग्रह के गहरे प्रतीकात्मक अर्थ जानें।13 Sep 2026 · 5 min read
देवी-देवताअष्टविनायक यात्रा: महाराष्ट्र के आठ स्वयंभू गणपति-क्षेत्रों की कथाअष्टविनायक — महाराष्ट्र के आठ स्वयंभू गणेश-क्षेत्र। मोरगाँव से रांजणगाँव तक यात्रा-क्रम, हर क्षेत्र की कथा और परंपरा का विस्तृत परिचय।14 Sep 2026 · 6 min readABC Chemistry Blog
ABC Chemistry · 422 postsAll ABC Chemistry Blog posts →
BlogReaction Mechanisms Study Material — IIT-JAM, CSIR-NET, GATEAre you preparing for competitive exams like IIT JAM, CSIR NET, GATE, TIFR, or BARC? Our comprehensive study package is designed to help you develop a deep23 Mar 2025 · 2 min read
BlogAcids and Bases Study Material — IIT-JAM, CSIR-NET, GATEUnderstanding Acids and Bases is fundamental to Inorganic Chemistry, playing a crucial role in reaction mechanisms, equilibrium, and analytical chemistry.24 Mar 2025 · 2 min read
BlogAsymmetric Synthesis Study Material — IIT-JAM, CSIR-NET, GATEAre you preparing for competitive exams like IIT JAM, CSIR NET, GATE, TIFR, or BARC? Do you want to master asymmetric synthesis, one of the most crucial24 Mar 2025 · 2 min read
BlogAtomic Structure Study Material — IIT-JAM, CSIR-NET, GATEAre you preparing for IIT JAM, CSIR NET, GATE, TIFR, or BARC? Our expert-curated study package is designed to give you an in-depth understanding of atomic24 Mar 2025 · 2 min read
BlogChemical Bonding Study Material — IIT-JAM, CSIR-NET, GATEAre you preparing for IIT JAM, CSIR NET, GATE, TIFR, or BARC & want to master Chemical Bonding, one of the most fundamental and scoring topics in Inorganic24 Mar 2025 · 2 min read
BlogGeneral Inorganic Chemistry Study Material — IIT-JAM, CSIR-NET, GATEAre you preparing for IIT JAM, CSIR NET, GATE, TIFR, or BARC? Our expert-curated study package is designed to help you grasp complex inorganic concepts with24 Mar 2025 · 2 min readDiscount Coupons — Guides
Great Directory · 1 postsAll Discount Coupons — Guides posts →
Great Home Tutor Blog
Great Education · 188 postsAll Great Home Tutor Blog posts →
Subject-wise TuitionAccountancy Format and Working Notes: the Marks Students Give AwayWorking notes are part of the answer and carry their own marks. Number them, reference them, and write every practice question in full exam format.07 Sep 2026 · 2 min read
Parent & Student GuidesAfter the Boards: Chemistry for the Entrance Exams That FollowBoard preparation trains writing; entrances reward speed and elimination. Switch mode deliberately, drill inorganic daily, and rest before grinding.19 Sep 2026 · 3 min read
Subject-wise TuitionAldehydes and Ketones: the Reactions a Student Must Simply KnowSeparate what can be reasoned from what must be memorised. Nucleophilic addition explains reactivity; the tests and named reactions need spaced recall.20 Sep 2026 · 2 min read
Subject-wise TuitionThe Algebra Gap That Shows Up as a Calculus ProblemFactorisation, indices, algebraic fractions, expansion. The four specific pieces that break calculus students, and how long each takes to repair.11 Sep 2026 · 2 min read
Subject-wise TuitionApplication of Derivatives: Maxima, Minima and Word ProblemsThe calculus is routine; turning a paragraph into a single-variable function is not. The four-step skeleton and the domain check students skip.05 Sep 2026 · 4 min read
Parent & Student GuidesApplied Maths or Core Maths in Class 11: What the Choice DecidesAn eligibility decision more than a difficulty one. Check what the courses your child may apply to actually require, for the year they will apply.21 Sep 2026 · 2 min readGovernment Jobs
Great Directory · 55 postsAll Government Jobs posts →
Bank of India Recruitment 2026: Officers Scale I–IV – Last Date 25 SepBank of India has notified Officers Scale I–IV recruitment for 205 posts. Applications closed on 25 Sep 2026. Fee details are in the official notification.11 Oct 2026
Maha Metro Recruitment 2026: JE, Technician & Office Assistant – Last Date 25 SepMaha Metro has notified JE, Technician & Office Assistant recruitment for 56 posts. Applications closed on 25 Sep 2026.11 Oct 2026
AAI Recruitment 2026: Graduate, Diploma & ITI Apprentices – Last Date 16 SepAAI has notified Graduate, Diploma & ITI Apprentices recruitment for 205 posts. Applications closed on 16 Sep 2026. No application fee is charged.11 Oct 2026
JNPA Recruitment 2026: Pilot (Contract) – Last Date 12 OctJNPA has notified Pilot (Contract) recruitment. The last date to apply is 12 Oct 2026. Official notification link, eligibility and age limit inside.11 Oct 2026
PIHMCT Puducherry Recruitment 2026: Assistant Lecturer – Last Date 25 OctPIHMCT Puducherry has notified Assistant Lecturer recruitment for 3 posts. The last date to apply is 25 Oct 2026.11 Oct 2026
India Post Recruitment 2026: Gramin Dak Sevak (GDS) – Last Date 21 SepIndia Post has notified Gramin Dak Sevak (GDS) recruitment. Applications closed on 21 Sep 2026. Fee details are in the official notification.11 Oct 2026Examination News
Great Directory · 130 postsAll Examination News posts →
All India Institute of Medical Sciences (AIIMS), New DelhiEvery exam All India Institute of Medical Sciences (AIIMS), New Delhi currently has tracked here, with the official site and current status for each.14 Oct 2026
Indian ArmyEvery exam Indian Army currently has tracked here, with the official site and current status for each.14 Oct 2026
BITS PilaniEvery exam BITS Pilani currently has tracked here, with the official site and current status for each.14 Oct 2026Bihar School Examination BoardEvery exam Bihar School Examination Board currently has tracked here, with the official site and current status for each.14 Oct 2026
Central Board of Secondary EducationEvery exam Central Board of Secondary Education currently has tracked here, with the official site and current status for each.14 Oct 2026
Chhattisgarh Board of Secondary EducationEvery exam Chhattisgarh Board of Secondary Education currently has tracked here, with the official site and current status for each.14 Oct 2026