ENGLISH MEDIUM कक्षा 12 वीं स्टूडेंट्स के लिए आगामी Quarterly Examination 2026-27 के लिए CHEMISTRY विषय का मॉडल / प्रैक्टिस प्रश्न पत्र दिया गया है . स्टूडेंट्स इसका अभ्यास अवश्य करें .
हिन्दी मीडियम के लिए कक्षा 12 केमिस्ट्री का प्रश्न पत्र देखें
Quarterly Examination 2026-27 (Model Paper) ENGLISH MEDIUM
Class: 12th | Subject: Chemistry
Time Allowed: 03 HoursMaximum Marks: 70
General Instructions:
- All questions are compulsory.
- Question numbers 1 to 5 are objective type questions carrying 1 mark each (Total 28 marks).
- Question numbers 6 to 12 are short answer type-I questions carrying 2 marks each.
- Question numbers 13 to 16 are short answer type-II questions carrying 3 marks each.
- Question numbers 17 to 20 are long answer type questions carrying 4 marks each.
- Internal choices (“OR”) are provided in question numbers 6 to 20.
Q1. Choose and write the correct option: (1×6 = 6 Marks)
(i) What is the molarity of pure water?
(a) 55.5 M
(b) 5.55 M
(c) 18 M
/(d) 0.18 M
(ii) What is the unit of specific conductivity?
(a) ohm⁻¹ cm⁻¹
(b) ohm cm
(c) ohm⁻¹ cm²
(d) ohm cm⁻¹
(iii) Which of the following is not a transition element?
(a) Fe
(b) Mn
(c) Zn
(d) Cr
(iv) What is the oxidation number of Cobalt (Co) in [Co(NH₃)₆]Cl₃?
(a) +2
(b) +3
(c) +4
(d) +6
(v) Chlorobenzene reacts with sodium metal in the presence of dry ether to form diphenyl. This reaction is called:
(a) Wurtz reaction
(b) Fittig reaction
(c) Sandmeyer reaction
(d) Friedel-Crafts reaction
(vi) Which of the following carbohydrates is found in milk?
(a) Sucrose
(b) Maltose
(c) Lactose
(d) Glucose
Q2. Fill in the blanks: (1×6 = 6 Marks)
(i) The number of moles of solute dissolved per liter of solution is called ________________.
(ii) The potential of a Standard Hydrogen Electrode (SHE) is assumed to be ________________ Volt.
(iii) Elements of d-block are also known as ________________ elements.
(iv) The main Coordination Theory of coordination complexes was proposed by ________________.
(v) An SN¹ reaction completes in ________________ steps.
(vi) Proteins are polymers of ________________.
Q3. Write True or False: (1×6 = 6 Marks)
(i) The solubility of gases in liquids increases with an increase in temperature.
(ii) Rusting of iron is an electrochemical phenomenon.
(iii) Due to lanthanoid contraction, Zr and Hf possess nearly identical atomic radii.
(iv) [Fe(CN)₆]⁴⁻ is an outer orbital complex.
(v) Chloroform is stored in dark-colored bottles to prevent its oxidation.
(vi) Uracil base is found in DNA.
Q4. Match the columns: (1×5 = 5 Marks)
| Column (A) | Column (B) |
|---|---|
| (i) Raoult’s Law | (a) Vitamin B₁₂ |
| (ii) Faraday’s First Law | (b) Chiral carbon |
| (iii) Configuration of Chromium (Cr) | (c) Ideal Solution |
| (iv) Electron pair donor to central metal | (d) m = Z · I · t |
| (v) Glucose | (e) [Ar] 3d⁵ 4s¹ |
| (f) Ligand |
Q5. Answer in one word/sentence: (1×5 = 5 Marks)
(i) Name the law that relates the vapor pressure of a solution to the mole fraction of the solute.
(ii) Write the formula used to calculate the Cell Constant.
(iii) What is the primary reason behind transition metals forming colored ions?
(iv) Write the IUPAC name of K₄[Fe(CN)₆].
(v) Which vitamin is responsible for the coagulation/clotting of blood?
Short Answer Type-I Questions (Q6 to Q12, carrying 2 marks each)
Q6. Define parts per million (ppm) and write its formula.
OR
State Henry’s law and mention one of its important applications.
Q7. State Kohlrausch’s law. Write two of its applications.
OR
Differentiate between an electrochemical cell and an electrolytic cell (Any two points).
Q8. Why do transition elements form interstitial compounds? Give reasons.
OR
Write two main differences between lanthanoids and actinoids.
Q9. What is a Chelate? Explain with an example.
OR
Differentiate between a double salt and a coordination complex (Any two points).
Q10. Explain Markovnikov’s rule with a suitable example.
OR
What happens when chlorobenzene is treated with nitric acid (HNO₃) in the presence of H₂SO₄? (Give chemical equation only)
Q11. What is a Zwitter Ion? Draw its structural representation.
OR
Write two structural differences between DNA and RNA.
Q12. Mention the deficiency diseases and primary dietary sources of Vitamin ‘A’ and Vitamin ‘C’.
OR
What is a Peptide Bond? Explain its formation.
Short Answer Type-II Questions (Q13 to Q16, carrying 3 marks each)
Q13. A sample of a beverage contains 5% (w/w) glucose solution. Calculate the molality of this solution. (Molar mass of glucose = 180 g/mol)
OR
What do you understand by elevation in boiling point? Derive an expression to determine the molecular mass of a non-volatile solute using it.
Q14. What is the Nernst equation? Explain the terms involved in it.
OR
Define Corrosion. Describe the mechanism of rusting of iron along with relevant chemical equations.
Q15. Give reasons:
(a) Transition metals and their compounds act as good catalysts.
(b) Cu⁺ is diamagnetic whereas Cu²⁺ is paramagnetic.
OR
What is Lanthanoid Contraction? Write its causes and two important consequences.
Q16. Explain the following named reactions with chemical equations (Any two):
(a) Sandmeyer Reaction (b) Finkelstein Reaction (c) Hunsdiecker Reaction
OR
Write three reasons for the low reactivity of chlorobenzene towards nucleophilic substitution reactions.
Long Answer Questions (Q17 to Q20, carrying 4 marks each)
Q17. What is a non-ideal solution? Write four differences between non-ideal solutions showing positive deviation and negative deviation.
OR
What are colligative properties? Describe Berkeley and Hartley’s method for measuring osmotic pressure with a labeled diagram.
Q18. State and explain Faraday’s first and second laws of electrolysis along with their mathematical derivations.
OR
Describe the construction of a Dry Cell with a neat labeled diagram. Write the chemical reactions occurring at the anode and cathode.
Q19. On the basis of Valence Bond Theory (VBT), explain the hybridization, geometry, and magnetic nature of the complex ion [CoF₆]³⁻.
OR
What is Crystal Field Theory (CFT)? Explain the crystal field splitting of d-orbitals in an octahedral coordination entity with a neat diagram.
Q20. Differentiate between the mechanisms of SN¹ and SN² reactions (Any four points).
OR
What is meant by the Denaturation of Proteins? How does it affect the primary and secondary structures of a protein? Explain with examples.
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