Biomolecules
189 CBSE Class 12 Chemistry previous year questions (PYQs) from 4 papers, 2023 to 2026, with answers and worked solutions.
About this chapter
- Difficulty: 115 easy · 74 moderate.
- Most-asked subtopics: Carbohydrates (91), Proteins (47), Vitamins (30).
- Updated 13 September 2026.
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#1EasyVitamins
#2EasyCarbohydrates
#3EasyVitamins
#4ModerateCarbohydrates
#5ModerateProteins
#6ModerateCarbohydrates
#7ModerateCarbohydrates
#8EasyCarbohydrates
#9ModerateCarbohydrates
For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :#10ModerateProteins
#11ModerateCarbohydrates
#12EasyCarbohydrates
#13EasyNucleic Acids
For questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below :#14ModerateProteins
#15ModerateCarbohydrates
#16ModerateCarbohydrates
#17ModerateCarbohydrates
#18EasyProteins
#19ModerateProteins
#20ModerateCarbohydrates
#21EasyCarbohydrates
#22EasyProteins
#23ModerateProteins
#24ModerateCarbohydrates
#25EasyProteins
#26EasyProteins
#27EasyVitamins
#28EasyCarbohydrates
#29EasyCarbohydrates
#30ModerateCarbohydrates
#31EasyCarbohydrates
#32ModerateCarbohydrates
#33EasyVitamins
#34EasyVitamins
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#35EasyVitamins
#36ModerateCarbohydrates
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#37EasyCarbohydrates
#38EasyProteins
#39EasyCarbohydrates
#40EasyVitamins
Certain organic compounds are required in small amounts in our diet but their deficiency causes specific disease. These compounds are called vitamins. Most of the vitamins cannot be synthesized in our body but plants can synthesize almost all of them. So they are considered as essential food factors. However, the bacteria of the gut can produce some of the vitamins required by us. All the vitamins are generally available in our diet. The term ‘vitamin’ was coined from the words vital + amine, since the earlier identified compounds had amino group. Vitamins are classified into two groups depending upon their solubility in water or fat namely-fat soluble vitamins and water soluble vitamins.#41EasyCarbohydrates
#42EasyCarbohydrates
#43EasyCarbohydrates
#44EasyCarbohydrates
#45EasyCarbohydrates
#46EasyVitamins
#47ModerateCarbohydrates
#48EasyVitamins
#49ModerateCarbohydrates
#50EasyVitamins
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
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