CBSE Class 11 Chemistry Sample Paper Set 2 — Free PDF
Complete chemistry sample paper covering atomic structure, chemical bonding, states of matter, and thermodynamics. Master calculations and conceptual quest
TL;DR: Complete chemistry sample paper covering atomic structure, chemical bonding, states of matter, and thermodynamics. Master calculations and conceptual…
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Complete chemistry sample paper covering atomic structure, chemical bonding, states of matter, and thermodynamics. Master calculations and conceptual questions with step-by-step solutions. This is a shortened practice set: 27 questions worth 69 marks, following the 70-mark CBSE paper pattern. Use it for timed practice, not as a full-length mock.
Board: CBSE · Class: Class 11 · Subject: Chemistry · Total: 69 marks · Time: 3 hours
Section A - Objective Type Questions — 8 marks
Attempt all questions. Each question carries 1 mark.
Q1. The number of electrons in one mole of electrons is? (1 mark)
Answer: 6.022 x 10^23
Q2. Planck's constant h equals approximately? (1 mark)
Answer: 6.626 x 10^-34 J*s
Q3. Bohr radius of hydrogen atom is? (1 mark)
Answer: 0.53 Angstrom
Q4. The shape of s orbital is? (1 mark)
Answer: Spherical
Q5. Bond angle in methane (CH4) is? (1 mark)
Answer: 109.5 degrees
Q6. The SI unit of molarity is? (1 mark)
Answer: mol/L
Q7. Which gas has least density at same temperature and pressure? (1 mark)
Answer: Hydrogen
Q8. The process of dissolving of solute in solvent is? (1 mark)
Answer: Solvation or Dissolution
Section B - Short Answer Questions — 28 marks
Attempt all questions. Each question carries 2 or 3 marks.
Q1. Explain atomic radius and write factors affecting it. (2 marks)
Answer: Distance of outer electron from nucleus, Increases down group, Decreases across period
Q2. What is ionization enthalpy? Explain its trend in periodic table. (3 marks)
Answer: Energy required to remove electron, Increases across period, Decreases down group, Half-filled and filled subshells have high values
Q3. Explain the concept of electronegativity with Pauling scale. (2 marks)
Answer: Tendency to attract shared electron, Pauling scale: 0-4, Fluorine has highest value of 4
Q4. Write Lewis structure of CO2 and explain bonding. (2 marks)
Answer: O=C=O with double bonds, Linear structure, Non-polar molecule
Q5. Explain the concept of hybridization with sp, sp2, sp3 examples. (3 marks)
Answer: Mixing of atomic orbitals, sp: linear, sp2: trigonal planar, sp3: tetrahedral
Q6. What is VSEPR theory? Explain its application. (2 marks)
Answer: Electron pairs repel each other, Determines molecular geometry, Predicts 3D shape of molecules
Q7. Explain intermolecular forces and write types with examples. (3 marks)
Answer: London forces: weakest, Dipole-dipole: medium, Hydrogen bonding: strongest
Q8. What is molarity? Calculate molarity of 2 moles solute in 500 mL solution. (2 marks)
Answer: Moles of solute per liter of solution, M = 2/0.5 = 4 M
Q9. Explain the concept of isotopes and give example. (2 marks)
Answer: Same atomic number different mass number, Example: Carbon-12 and Carbon-14
Q10. Write gas law and derive ideal gas equation. (3 marks)
Answer: PV = nRT, Combining Boyles, Charles, and Avogadro laws
Q11. What is Daltons law of partial pressures? (2 marks)
Answer: Total pressure = sum of partial pressures of gases, P_total = P1 + P2 + P3...
Q12. Explain the first law of thermodynamics with example. (2 marks)
Answer: dQ = dU + dW, Heat absorbed equals change in internal energy plus work done
Section C - Long Answer Questions — 33 marks
Attempt all questions. Each question carries 4 or 5 marks.
Q1. Explain Bohr model of hydrogen atom with postulates and derive Bohr radius formula. (5 marks)
Answer: Quantization of angular momentum, Energy levels, Bohr radius = 0.53 Angstrom derived from force balance and Coulombs law
Q2. Describe the shapes of p and d orbitals. Explain orbital concept. (5 marks)
Answer: p orbital: dumbbell-shaped, d orbital: cloverleaf-shaped, Orbital: 3D region with high probability of finding electron
Q3. Explain the concept of electronegativity and ionic versus covalent bonding. (5 marks)
Answer: Electronegativity difference > 1.7: ionic, < 0.4: covalent, 0.4-1.7: polar covalent
Q4. Describe the properties of gases and explain deviation from ideal behavior. (5 marks)
Answer: Ideal gases: no intermolecular forces, negligible volume, Real gases deviate due to intermolecular attractions and molecular volume
Q5. Explain thermodynamic terms and define internal energy with examples. (5 marks)
Answer: Internal energy: total energy of system, U = sum of kinetic + potential energy, State function, Independent of path
Q6. Describe the structure of benzene and explain resonance in aromatic compounds. (4 marks)
Answer: Planar hexagonal structure, Resonance: multiple Lewis structures possible, Conjugated pi bonds provide stability
Q7. Write solutions of different types and explain colligative properties. (4 marks)
Answer: Unsaturated, saturated, supersaturated solutions, Colligative properties: vapor pressure, boiling point, freezing point depression, osmotic pressure
FAQs
What are the key chapters in Class 11 Chemistry?
Some systems, Atomic structure, Periodic table, Chemical bonding, States of matter, and Thermodynamics are fundamental.
What is the exam pattern?
70 marks with 3 hours duration, covering MCQ, short answer questions, and long answer problems.
How to prepare for problem-solving?
Understand concept, learn formula, practice variations, check significant figures, master unit conversions.
All sample papers → · Previous-year questions → · Chapter-wise MCQs →