CBSE Class 11 Chemistry Question Paper Set 20 Solved

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Previous Year Question Papers for Class 11 Chemistry

Access comprehensive previous year question papers for Class 11 Chemistry using the CBSE Class 11 Chemistry Question Paper Set 20 Solved. Designed to align with the 2026-27 CBSE academic guidelines, these solved papers help students assess their exam readiness and understand official marking schemes.

Practice Class 11 Chemistry Exam Papers

Navigate directly to the solved Chemistry question papers using the digital viewer below. Each practice set includes detailed solutions, allowing students to instantly cross-check their work and identify areas requiring further revision.

1. Why do atomic masses of most of the elements in atomic mass units involve fractions? 
 
2. How many electrons in a given atom can have the following quantum numbers?
n = 3 , l = 1
 
3. Write any two applications of dipole moment. 
 
4. Lanthanoids and actinoids are placed in separate rows at the bottom of the periodic table. Give reason for this arrangement.
 
5. What do you mean by biological oxygen demand (BOD)? 
 
6. What do you understand by formula mass? How does it differ from molecular mass? 
 
7. Explain giving reasons, which of the following sets of quantum numbers are not possible.
i) n = 0 , l = 1 , ml = 0 , ms = + ½
ii) n = 2 , l = 1 , ml = 0 , ms = - ½
iii) n = 3 , l = 2 , ml = -2 , ms = + ½
iv) n = 1 , l = 1 , ml = -1 , ms = + ½
 
8. What is greenhouse effect and what are its consequences? 
 
9. Arrange the following elements in the order of the property indicated:
i) N3-, O2- , Mg2+, Na+ , F- , Al3+ (increasing ionic radii)
ii) F , N , Si , C (decreasing non-metallic character)
 
10. Predict giving reason whether each of the following molecule is polar or non-polar:
i) H2O
ii) CO2
 
11. Give reason for the following:
i) Anionic radius is always more than that of a neutral atom.
ii) Third period of periodic table can accommodate 18 elements but it has only 8 elements.

OR
 
The first (IE1) and the second (IE2) ionization energies and electron gain enthalpies of four elements A , B ,C and D are shown below:
CBSE Class 11 Chemistry Question Paper Set O Solved 1
Which of the element is likely to be :
i) A reactive metal
ii) A noble gas
iii) A metal that forms a stable binary halide of the formula AX2
iv) A reactive non-metal
 
12. What is Eutrophication? How does it threaten the development of fish? 
 
13. Define the following:
i) Avogadro’s law
ii) Limiting reagent
iii) Mole fraction
 
14. Electrons are emitted with zero velocity from the surface of a metal when it is exposed to radiation of wavelength 6800A0. Calculate the threshold frequency and work function of the metal. (c = 3 x 108m/s , h = 6.63 x 10-34)
 
15. Explain limitations of octet rule with the help of examples. (any three)
 
OR
 
Write all the favourable conditions for the formation of ionic bond.
 
16. An element ‘X’ with atomic number 110 has been recently predicted. Its electronic configuration is: [Rn] 5f146d87s2. Predict the
i) Group and
ii) Block in which this element would be placed.
iii) IUPAC name of this element


Please click on below link to download CBSE Class 11 Chemistry Question Paper Set T Solved

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Past Exam Papers & Solutions for Class 11 Chemistry

Class 11 Chemistry Past Exam Papers & Resources

Review authentic examination papers for Class 11 Chemistry. Working through the CBSE Class 11 Chemistry Question Paper Set 20 Solved allows learners to decode recurring question trends and familiarize themselves with official CBSE evaluation standards.

Importance of Solving CBSE Class 11 Chemistry Question Paper Set 20 Solved

Practicing past question sets under timed home conditions helps refine pacing and time management skills, ensuring you complete your Chemistry examination comfortably within the official duration.

Complete Your Exam Preparation

Pair your past paper revision with our official Class 11 Chemistry sample papers and online practice modules to achieve total curriculum mastery.

FAQs

Where can I download the official PDF for CBSE Class 11 Chemistry Question Paper Set 20 Solved?

The CBSE Class 11 Chemistry Question Paper Set 20 Solved is available for download on StudiesToday.com. It includes complete set with all sections so that Class 11 students can practice with the exact same paper that came in the CBSE exams.

Are the solutions for CBSE Class 11 Chemistry Question Paper Set 20 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 11 Chemistry Question Paper Set 20 Solved are prepared by subject matter experts as per official marking scheme. Class 11 students will understand the structure of answers and 'step-marks' methodology Chemistry.

How does solving CBSE Class 11 Chemistry Question Paper Set 20 Solved help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 11 Chemistry Question Paper Set 20 Solved is important to understand repeat themes and question difficulty levels of Chemistry. It helps Class 11 students to test their time management skills too.

Can I access CBSE Class 11 Chemistry Question Paper Set 20 Solved in different languages?

Yes, where applicable, CBSE Class 11 Chemistry Question Paper Set 20 Solved is available in both English and Hindi mediums. All students from Class 11 can access Chemistry study material in their preferred language.

Is there a charge to download the CBSE Class 11 Chemistry solved papers?

No, all previous year question papers on StudiesToday, including CBSE Class 11 Chemistry Question Paper Set 20 Solved, are provided free of charge in mobile-friendly PDF.