CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved

Chemistry
Download PDF

Download CBSE Class 12 Chemistry Question Papers

Access comprehensive previous year question papers for Class 12 Chemistry using the CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 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.

Access CBSE Question Papers and Solutions

Access the complete question paper PDF for Class 12 Chemistry below. Regular practice with these targeted exam papers builds familiarity with standard question patterns and helps secure higher marks in final evaluations.

SECTION : A
Read the given passage and answer the questions 1 to 5 that follow :
 
The halogens have the smallest atomic radii in their respective periods.
 
The atomic radius of fluorine is extremely small. All halogens exhibit – oxidation state. They are strong oxidising agents and have maximum negative electron gain enthalpy. Among halogens, fluorine shows anomalous behaviour in many properties. For example electro negativity and ionisation enthalpy are higher for fluorine than expected whereas bond dissociation enthalpy, m.p. and b.p. and electron gain enthalpy are quite lower than expected. Halogens react with hydrogen to give hydrogen halides (HX) and combine amongst themselves to form a number of compounds of the type XX', XX'3, XX'5 and XX'7 called inter-halogens.
 
1. Why halogens have maximum negative electron gain enthalpy ?
 
2. Why fluorine shows anomalous behaviour as compared to other halogens ?
 
3. Arrange the hydrogen halides (HF to HI) in the decreasing order of their reducing character.
 
4. Why fluorine is a stronger oxidizing agent than chlorine ?
 
5. What are the sizes of X and X' in the interhalogen compounds ?
 
Question 6 to 10 are one word answers.
 
6. Name the cell used in hearing aids and watches.
 
7. How much charge in terms of Faraday is required to reduce one mol of MnO4– to Mn2+ ?
 
8. Write the slope value obtained in the plot of log [Ro] / [R] Vs. time for a first order reaction.
 
9. Name the sweetening agent used in the cooking of sweets for a diabetic patient.
 
10. Name the polymer which is used for making electrical switches and combs.
 
Questions 11 to 15 are multiple choice questions.
 
11. In the Mond’s process the gas used for the refining of a metal is
(a) H2              (b) CO2
(c) CO              (d) N2
 
12. The conversion of an alkyl halide into an alcohol by aqueous NaOH is classified as
(a) a dehydrohalogenation reaction
(b) a substitution reaction
(c) an addition reaction
(d) a dehydration reaction
 
13. CH3CONH2 on reaction with NaOH and Br2 in alcoholic medium gives
(a) CH3CH2NH2            (b) CH3CH2Br
(c) CH3NH2                  (d) CH3COONa
 
14. The oxidation state of Ni in [Ni(CO)4] is
(a) 0              (b) 2
(c) 3              (d) 4
 
15. Amino acids are
(a) acidic               (b) basic
(c) amphoteric       (d) neutral
 
Questions 16 to 20.
 
(A) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
 
(B) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
 
(C) Assertion (A) is correct, but Reason (R) is wrong statement.
 
(D) Assertion (A) is wrong, but Reason (R) is correct statement.
 
16. Assertion (A) : Conductivity of an electrolyte increases with decrease in concentration.
 
      Reason (R) : Number of ions per unit volume decreases on dilution.
 
17. Assertion (A) : The C-O-C bond angle in ethers is slightly less than tetrahedral angle.
 
      Reason (R) : Due to the repulsive interaction between the two alkyl groups in ethers.
 
18. Assertion (A) : Low spin tetrahedral complexes are rarely observed.
 
      Reason (R) : Crystal field splitting energy is less than pairing energy for tetrahedral complexes.
Please click on below link to download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set E.

Free study material for Chemistry

Past Exam Papers & Solutions for Class 12 Chemistry

Previous Year Question Papers: Class 12 Chemistry

Review authentic examination papers for Class 12 Chemistry. Working through the CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved allows learners to decode recurring question trends and familiarize themselves with official CBSE evaluation standards.

Boost Your Exam Score with Past Papers

Reviewing official papers clarifies the exact marking scheme and structural layout established by the CBSE, enabling students to structure answers for maximum score potential.

Enhance Practice with Sample Papers & Solutions

Download digital copies of these papers for convenient offline revision anywhere. Cross-check your completed steps against our expert solution guides to ensure complete accuracy.

FAQs

Where can I download the official PDF for CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved?

The CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved is available for download on StudiesToday.com. It includes complete set with all sections so that Class 12 students can practice with the exact same paper that came in the CBSE exams.

Are the solutions for CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved are prepared by subject matter experts as per official marking scheme. Class 12 students will understand the structure of answers and 'step-marks' methodology Chemistry.

How does solving CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved is important to understand repeat themes and question difficulty levels of Chemistry. It helps Class 12 students to test their time management skills too.

Can I access CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved in different languages?

Yes, where applicable, CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved is available in both English and Hindi mediums. All students from Class 12 can access Chemistry study material in their preferred language.

Is there a charge to download the CBSE Class 12 Chemistry solved papers?

No, all previous year question papers on StudiesToday, including CBSE Class 12 Chemistry Boards 2020 Question Paper Set 05 Solved, are provided free of charge in mobile-friendly PDF.