Summary of NIOS Class 12th Chemistry Most Important Questions with Solutions | Pass 100% | NO Fail

Summary of the Video: "NIOS Class 12th Chemistry Most Important Questions with Solutions | Pass 100% | NO Fail"

This video is a comprehensive revision and exam preparation session for NIOS Class 12 Chemistry students. The instructor covers key concepts, important questions, exam strategies, and common mistakes to avoid, aiming to help students pass confidently with good marks.

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Main Ideas, Concepts, and Lessons Conveyed:

1. Exam Preparation and Strategy

• Revise the entire syllabus focusing on important chapters and topics.
• Emphasize reading all questions carefully and underlining keywords.
• Attempt all questions; do not leave any blank.
• Start answering easy questions first to build confidence.
• Time management: Allocate about 15 minutes for 16 MCQs (1 min per question).
• Write answers clearly, avoid crossing out or messy work.
• For numerical problems, write all steps clearly; do not skip steps.
• If unsure about an answer, attempt it with the best guess or partial solution.
• Read the question paper thoroughly before starting.
• First impression matters: neat and organized answer sheets can earn better marks.
• Avoid common mistakes like misreading questions, ignoring units, or wrong symbols.

2. Important Chemistry Concepts Covered

• Laws of Chemical Combination:
  • Law of Conservation of Mass: Mass neither created nor destroyed.
  • Law of Definite Proportions: Fixed mass ratio in compounds.
  • Law of Multiple Proportions: Ratios of masses in different compounds are simple multiples.
• Atomic Structure:
  • Dalton’s atomic theory basics.
  • Isotopes (same atomic number, different mass number) and isobars (same mass number, different atomic number).
  • Thomson’s plum pudding model and its limitations.
  • Rutherford’s gold foil experiment and nucleus discovery.
  • Bohr’s model and its drawbacks.
  • Quantum numbers: principal, azimuthal, magnetic, and spin.
  • Pauli Exclusion Principle and Hund’s Rule.
  • Electronic configurations and orbital filling order.
• Mole Concept and Stoichiometry:
  • Definition of mole and Avogadro’s number (6.022 × 10²³).
  • Calculations involving molar mass, number of moles, molecules.
  • Empirical and molecular formulas.
  • Limiting reagent concept and stoichiometric calculations.
• Periodic Table and Properties:
  • Trends in atomic size, ionization energy, electronegativity, metallic character.
  • Diagonal relationships in elements.
  • S-block and P-block elements: properties, oxidation states, flame test colors.
  • Preparation and uses of compounds like H₂O₂, calcium carbonate, lime, etc.
• Chemical Bonding and Molecular Structure:
  • Covalent and interstitial hydrides.
  • Shapes and orientation of orbitals (spherical for s, dumbbell for p, etc.).
  • Scientific notation and SI units.
• Electromagnetic Radiation and Spectra:
  • Wave nature of electrons (de Broglie wavelength).
  • Heisenberg’s Uncertainty Principle.
  • Electromagnetic spectrum and its regions.
  • Lyman, Balmer, Paschen series.
• Biomolecules:
  • Carbohydrates: monosaccharides, disaccharides, polysaccharides.
  • Glycosidic linkage formation.
  • Amino acids and peptide bonds.
  • Structure and differences between DNA and RNA.
• Redox Reactions and Balancing:
  • Balancing redox reactions using ion-electron method.
  • Identification of oxidation and reduction.
• Polymers:
  • Types of polymers: homopolymers, copolymers, natural polymers.
  • Examples like nylon.

3. Exam Question Paper Pattern

• Total marks: 80 (40 objective + 40 subjective).
• Objective section includes MCQs, fill-in-the-blanks, match the following, passage-based questions.
• Subjective section includes short answer (2 marks), longer answers (3-5 marks).
• Emphasis on attempting all questions and not leaving any blank.
• Objective questions (16 MCQs) carry 16 marks.
• Match the following and fill-in-the-blanks carry 24 marks.
• Subjective questions divided into 9 two-mark, 3 three-mark, 4 four-mark, and 2 five-mark questions.

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Methodology / Instructions for Exam Success:

Before Exam:

• Revise important laws, formulas, and concepts using a white page and writing without looking.
• Practice numerical problems with stepwise solutions.
• Understand the syllabus weightage and focus on high-mark topics.

During Exam:

• Read the entire question paper first.
• Start with easy questions to secure marks quickly.
• Manage time strictly: 1 min per MCQ.

Notable Quotes

— 104:34 — « When I was in 12th, I used to think that I was in 12th. I was also very scared, but I felt a little calm after going there. I used to stay calm and meditate a little. »

— 105:10 — « First impression is your last impression. If your impression is very good then you will score good marks. »

— 119:46 — « I know you're just getting a little nervous, you are a little scared which is not needed. It's ok now it doesn't matter. »

— 120:16 — « If you don't know any question then write it down. Try to attempt as much as you can. Whatever you know about that thing, write it down. It's okay to give, you don't have to leave even one. »

— 121:00 — « Read a lot, take rest, eat and drink a little. When you go to give the paper, all the best to everyone. »

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Educational

Video