CBSE Class 12 Chemistry Important MCQs 2026 | Chapter-wise Questions & PDF

CBSE Class 12 Chemistry Important MCQs are one of the best ways to prepare smartly for your board exam. MCQs help you revise concepts quickly, improve accuracy and understand how questions are framed in the exam. With regular practice, you can identify weak areas and strengthen them before the final paper. If you want to boost your score and feel confident on exam day solving important MCQs daily for CBSE Class 12 Chemistry exam is a must.

CBSE 12 Chemistry Important Questions PDF

Students preparing for board exams can download the CBSE Class 12 Chemistry MCQs PDF for fast and smart revision. This PDF includes important chapters such as Solid State, Solutions, Electrochemistry, Chemical Kinetics, Organic Chemistry, and Coordination Compounds. Regular practice of these MCQs helps improve conceptual clarity, strengthen reaction-based understanding and enhance accuracy in numerical and theory questions. Students can download the CBSE Class 12 Chemistry important questions PDF given below for effective last minute preparation.

CBSE Class 12 Chemistry Important Questions PDF

CBSE 12th Chemistry Chapter-Wise Weightage

Understanding CBSE 12th Chemistry chapter-wise weightage helps you focus on high-scoring topics first. Some chapters carry more marks, so preparing them well can increase your overall score. Divide your study time according to the marks distribution and difficulty level of each chapter. Smart planning based on weightage can help you score 90% or more in the Chemistry board exam.

Top 15 Most Asked MCQs (Previous Year Papers)

1. Which of the following is diamagnetic in nature?
   (A) Co³⁺, octahedral complex with strong field ligand
   (B) Co³⁺, octahedral complex with weak field ligand
   (C) Cr³⁺, octahedral complex
   (D) Fe³⁺, octahedral complex
   [Atomic number: Co = 27, Cr = 24, Fe = 26]
2. The molar ionic conductivities of Ca²⁺ and Cl⁻ are 119.0 and 76.3 S cm² mol⁻¹ respectively. The value of limiting molar conductivity of CaCl₂ will be:
   (A) 195.3 S cm² mol⁻¹
   (B) 43.3 S cm² mol⁻¹
   (C) 314.3 S cm² mol⁻¹
   (D) 271.6 S cm² mol⁻¹
3. The compound which undergoes SN1 reaction most rapidly is:
   (A) CH₃CH₂Cl
   (B) CH₂=CHCH₂Cl
   (C) C₆H₅Cl
   (D) (CH₃)₃CCl
4. Assertion (A): When NaCl is added to water a depression in freezing point is observed.
   Reason (R): NaCl undergoes dissociation in water.
   (A) Both (A) and (R) are true and (R) is the correct explanation of (A).
   (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
   (C) (A) is true, but (R) is false.
   (D) (A) is false, but (R) is true.
5. Which of the following compounds will give a ketone on oxidation with chromic anhydride (CrO₃)?
   (A) (CH₃)₂CHCH₂OH
   (B) CH₃CH₂CH₂OH
   (C) (CH₃)₃COH
   (D) CH₃CH₂CH(OH)CH₃
6. The relative lowering of vapour pressure of an aqueous solution containing non-volatile solute is 0.0225. The mole fraction of the non-volatile solute is:
   (A) 0.80
   (B) 0.725
   (C) 0.15
   (D) 0.0225
7. Match the cell in Column I with its use in Column II

Options:

(A) i–b, ii–c, iii–a
(B) i–a, ii–b, iii–c
(C) i–c, ii–a, iii–b
(D) i–b, ii–a, iii–c

8. In the Haworth structure of glucose, the anomeric carbon is:
   (A) C-1
   (B) C-2
   (C) C-5
   (D) C-4
9. Assertion (A): Separation of Zr and Hf is difficult.
   Reason (R): Zr and Hf have similar radii due to lanthanoid contraction.
   (A) Both (A) and (R) are true and (R) is the correct explanation of (A).
   (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
   (C) (A) is true, but (R) is false.
   (D) (A) is false, but (R) is true.

10. The correct name of the given reaction is:

Ar-N2+X-CuCN/KCNAr-CN+N2

(A) Sandmeyer’s reaction
(B) Gabriel Phthalimide synthesis
(C) Carbyl amine reaction
(D) Hoffmann bromamide reaction

11. For a zero order reaction, if the concentration of the reactant is doubled, its half-life is:
    (A) Doubled
    (B) Halved
    (C) Remains same
    (D) Tripled
12. Which of the following is most acidic?
    (A) Benzyl alcohol
    (B) Cyclohexanol
    (C) Phenol
    (D) m-Chlorophenol
13. Assertion (A): Aniline is a weaker base than ammonia.
    Reason (R): The unshared electron pair on nitrogen atom in aniline becomes less available for protonation due to resonance.
    (A) Both (A) and (R) are true and (R) is the correct explanation of (A).
    (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
    (C) (A) is true, but (R) is false.
    (D) (A) is false, but (R) is true.
14. Match the reaction with the product:

(i) CH3CH2OHH2SO4,443K____________

(ii) CH3CH2OHH2SO4,413K____________

Products: (a) Ethene, (b) Ethoxyethane
(A) i-a, ii-b
(B) i-b, ii-a
(C) Both result in (a)
(D) Both result in (b)

15. The vitamin whose deficiency causes increased blood clotting time is:
    (A) Vitamin A
    (B) Vitamin E
    (C) Vitamin K
    (D) Vitamin D

Final Tips to Crack Chemistry Board Exam with 90%+ Score

• Practice CBSE Class 12 Chemistry Important MCQs daily to improve accuracy and confidence
• Focus on high-weightage chapters first as per the latest board exam pattern
• Revise NCERT line by line, especially definitions, reactions, and formulas
• Make short notes for Organic Chemistry reactions and named reactions
• Practice numerical questions from Physical Chemistry regularly
• Solve previous year question papers and sample papers in exam-like conditions
• Avoid skipping Inorganic Chemistry theory questions as they are scoring
• Revise diagrams, mechanisms, and important equations one day before the exam
• Manage time properly in the exam and attempt easy questions first
• Stay calm, read each question carefully, and avoid silly mistakes

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