Chapter Wise CBSE Chemistry Important Questions with Marks Distribution and Weightage
Chemistry Important Questions
Chemistry is important as well as a complicated subject for Science students. Many students find this subject easy whereas many do not. Board exams are near and it's a very crucial time for preparation and revision. At this point, the Chemistry subject may seem scary. To help students with the upcoming board exams Vedantu have brought for you the most important CBSE questions of Chemistry. These questions will not only help the lagging students in Chemistry but also will help in the proper revision for those whose preparation is completed. These CBSE important questions are a must for all the 12 Class students who are going to appear for their board exams this year.
Marks wise Important Questions with Answers - Free pdf Download
The CBSE important questions of Chemistry are available in pdf format. With being easily downloadable and available for free of cost these important questions become handy for students. These solutions are prepared by our experienced faculty who are well versed in their respective subjects so these questions are highly dependable and will help students to score the best in their exams. No matter how much you lack behind in Chemistry do give us a try at our CBSE important questions of Chemistry.
Important Questions For Class 12 Chemistry CBSE With Answers
With proper focus on the syllabus of the Class 12th Chemistry as well as the pattern of the exams, we have prepared these most important questions of Chemistry for you all. This year CBSE has reduced a lot of syllabi. For scoring the best in exams knowing the syllabus is very important. We have shared the revised syllabus of Chemistry below-
There are a total of 16 Units divided into two books of NCERT of Chemistry as part1 and part 2.
Part 1
Unit 1 Solid-state
Unit 2 Solutions
Unit 3 ElectroChemistry
Unit 4 Chemical kinetics
Unit 5 Surface Chemistry
Unit 6 removed
Unit 7 p block elements
Unit 8 d and f block elements
Unit 9 Coordination compounds
Part 2
Unit 10 Haloalkanes and haloarenes
Unit 11 Alcohols, Phenols, and Ethers
Unit 12 Aldehydes ketones and carboxylic acids
Unit 13 Amines
Unit 14 Biomolecules
Unit 15 removed
Chapter Wise Questions Chemistry Class 12th Weightage
Why Are Class 12 Chemistry Important Questions
Marks wise important questions with their solutions help the students in a tension free preparation. Students can prepare better through these important questions.
Time management is important for any exam preparation. Our important questions help in the same.
Important questions also include those questions that are frequently asked in board exams.
If a student has no time to do a detailed preparation of Chemistry subject then he/she can use our important questions bank and score well in the exams.
Practicing from important questions is the best way to revise the concepts and do the proper practice.
FAQs on Marks Wise CBSE Chemistry Important Questions for Board Exam Preparation
1. What are the marks-wise important questions for CBSE Chemistry board exams?
Marks-wise CBSE Chemistry important questions are those categorized as 1, 2, 3, 4, or 5 marks based on the exam pattern and chapter weightage prescribed by CBSE.
For effective board exam preparation:
- 1-mark questions usually ask definitions, formulas, or simple facts (e.g., define molarity).
- 2–3 mark questions focus on short derivations, differences, balanced equations, or numerical problems.
- 4–5 mark questions include detailed explanations, mechanisms, long numerical calculations, or structured reasoning.
2. How should I prepare 1-mark important questions in CBSE Chemistry?
To prepare 1-mark questions in CBSE Chemistry, focus on clear definitions, formulas, laws, and key facts from NCERT.
Important preparation steps:
- Memorize definitions such as mole, electronegativity, and oxidation.
- Learn key formulas like M = n/V (molarity formula).
- Remember important laws such as the Law of Conservation of Mass.
- Revise IUPAC names, functional groups, and periodic trends.
3. What type of 3-mark numerical questions are important in CBSE Chemistry?
Three-mark numerical questions in CBSE Chemistry commonly involve mole concept, molarity, electrochemistry, and chemical kinetics calculations.
Common examples include:
- Calculating molarity using M = n/V.
- Using the Nernst equation: E = E° − (0.0591/n) log Q at 298 K.
- Applying the rate law: Rate = k[A]m[B]n.
4. What are the most important 5-mark questions in CBSE Chemistry?
Five-mark questions in CBSE Chemistry usually require detailed explanations, mechanisms, derivations, or long numerical problem-solving.
Frequently asked areas include:
- Derivation of Nernst equation in Electrochemistry.
- Mechanism of nucleophilic substitution reactions (SN1 and SN2).
- Structure and bonding in coordination compounds using VBT.
- Numericals based on chemical kinetics and half-life equations.
5. How do you balance chemical equations for board exam questions?
A chemical equation is balanced by ensuring the number of atoms of each element is equal on both sides of the equation.
Steps to balance equations:
- Write the unbalanced equation.
- Count atoms of each element on both sides.
- Adjust coefficients (not subscripts) to balance atoms.
- Recheck atom count.
2H2(g) + O2(g) → 2H2O(l)
Balanced equations are essential for 2–3 mark questions.
6. What are the most important name reactions in CBSE Organic Chemistry?
The most important name reactions in CBSE Organic Chemistry include Aldol condensation, Cannizzaro reaction, Hell–Volhard–Zelinsky reaction, and Sandmeyer reaction.
Example:
- Aldol condensation: Two molecules of aldehyde or ketone with α-hydrogen combine in the presence of base to form a β-hydroxy aldehyde or ketone.
7. What are common differentiation questions asked in CBSE Chemistry exams?
Common differentiation questions in CBSE Chemistry ask students to distinguish between related concepts using properties, structure, or reactions.
Frequently asked differences:
- Electrovalent bond vs Covalent bond
- SN1 vs SN2 reactions
- Strong acid vs Weak acid
- Physical change vs Chemical change
8. How do you calculate molarity in CBSE Chemistry numericals?
Molarity is calculated using the formula M = n/V, where n is moles of solute and V is volume of solution in litres.
Steps:
- Calculate moles using n = given mass / molar mass.
- Convert volume into litres.
- Substitute values into the molarity formula.
n = 5/40 = 0.125 mol
M = 0.125 / 0.5 = 0.25 M
9. What are the most important laws in CBSE Chemistry for board exams?
The most important laws in CBSE Chemistry include fundamental chemical laws and principles frequently asked in board exams.
Key laws include:
- Law of Conservation of Mass
- Law of Definite Proportions
- Raoult’s Law: p = p°x
- Faraday’s First Law of Electrolysis: m ∝ Q
- Hess’s Law of Constant Heat Summation
10. How can I score full marks in CBSE Chemistry board exam?
You can score full marks in CBSE Chemistry by mastering NCERT concepts, practicing marks-wise important questions, and writing structured answers with correct formulas and equations.
Scoring tips:
- Revise NCERT line-by-line and solved examples.
- Practice previous years’ question papers and sample papers.
- Write balanced chemical equations with correct state symbols.
- Show stepwise calculations in numericals.
- Highlight key terms like laws, formulas, and reactions neatly.
