Class 12 Chemistry — Chapter 10: Biomolecules
96 practice questions · 32 Easy · 32 Medium · 32 Hard
Practise Class 12 Chemistry Chapter 10, "Biomolecules", with 96 NCERT-aligned multiple-choice questions. The set is split into 32 Easy, 32 Medium and 32 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Biomolecules" is one of the chapters where reactions, named concepts, and balanced numerical work really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Biomolecules, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Chemistry mastery score. A few sample questions are shown below; sign in free to practise all 96.
Key concepts: Biomolecules (Class 12 Chemistry)
This chapter covers the chemistry of biomolecules — carbohydrates, proteins, vitamins and nucleic acids — and their structures and functions.
- Carbohydrates
- Polyhydroxy aldehydes/ketones; classified as mono- (glucose, fructose), di- (sucrose, maltose) and polysaccharides (starch, cellulose, glycogen).
- Glucose structure
- An aldohexose; its open-chain and cyclic (pyranose, α/β anomers) forms explain mutarotation and reactions.
- Proteins & amino acids
- Polymers of α-amino acids joined by peptide bonds; structures are primary, secondary, tertiary and quaternary; denaturation destroys higher structure.
- Enzymes & vitamins
- Enzymes are biological protein catalysts; vitamins (water- or fat-soluble) are essential micronutrients whose deficiency causes diseases.
- Nucleic acids
- DNA and RNA are polymers of nucleotides (base + sugar + phosphate); they store and transmit genetic information.
💡 Exam tips for Biomolecules
- Reducing sugars (glucose, fructose, maltose) give positive Tollens'/Fehling's tests; sucrose does not.
- Distinguish DNA (deoxyribose, thymine, double helix) from RNA (ribose, uracil, single strand).
Sample questions
Glucose formula:
Hexose monosaccharide.
Sucrose hydrolyses to:
Inversion of sugar.
Primary structure of protein refers to:
Linear order; secondary = α-helix/β-sheet.
Biomolecules — FAQs
What are the key concepts in Class 12 Chemistry Biomolecules?+
This chapter covers the chemistry of biomolecules — carbohydrates, proteins, vitamins and nucleic acids — and their structures and functions. Key ideas include Carbohydrates, Glucose structure, Proteins & amino acids, Enzymes & vitamins, Nucleic acids.
What does Class 12 Chemistry Chapter 10 (Biomolecules) cover on XamBaaz?+
It covers 96 NCERT-aligned MCQs on "Biomolecules" — 32 Easy, 32 Medium and 32 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Biomolecules" questions free to practise?+
Yes — sign in with Google to practise "Biomolecules" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Biomolecules" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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