Maharashtra Board Class 12 Chemistry Guess Paper 2027
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A full practice paper on the official Chemistry pattern, built from the most-likely questions by repetition analysis. Not an official or leaked paper.
Maharashtra Board Class 12 Chemistry — Guess Paper 2027
Time: 3 hours · Maximum marks: 70 · Practice paper
Section AQ1 ten MCQs (1 mark each) and Q2 eight very short answer questions (1 mark each)
Q1.1 mark
The spin only magnetic moment of Fe+2 ion is ___. (a) 3.806 BM (b) 4.899 BM (c) 5.796 BM (d) 6.817 BM
Why this question: Transition and Inner Transition Elements → Spin-only magnetic moment of a transition metal ion — appeared 5× Board 2023Board 2024Board 2025Board 2026
Q2.1 mark
The electrolyte used in H2-O2 fuel cell is _____. (a) aqueous KCl (b) aqueous KOH (c) aqueous HCl (d) aqueous KNO3
Why this question: Electrochemistry → Hydrogen-oxygen fuel cell (diagram/reactions/electrolyte) — appeared 3× Board 2023Board 2026
Q3.1 mark
Write the chemical name of Teflon.
Why this question: Introduction to Polymer Chemistry → Teflon preparation/monomer/chemical name — appeared 3× Board 2024Board 2025Board 2026
Q4.1 mark
The unit of rate constant is per second, the order of reaction is: (a) Zero (b) First (c) Second (d) Third
Why this question: Chemical Kinetics → MCQ: order of reaction from unit of rate constant — appeared 3× Board 2024Board 2025Board 2026
Q5.1 mark
The shape of bromine penta-fluoride is _____. (a) Linear (b) Bent-T-Shape (c) Tetrahedral (d) Square pyramidal
Why this question: Elements of Groups 16, 17 and 18 → Interhalogen compounds (definition/formula/shape) — appeared 3× Board 2024Board 2025Board 2026
Q6.1 mark
The reagent used to convert acetyl chloride to acetaldehyde is: (a) SnCl2 + HCl (b) Zn-Hg + Conc.HCl (c) NH2-NH2/KOH,glycol (d) H2/Pd-BaSO4
Why this question: Aldehydes, Ketones and Carboxylic Acids → Rosenmund reduction & Gatterman-Koch formylation — appeared 3× Board 2024Board 2025Board 2026
Q7.1 mark
The pOH of 0.01 M HCl solution is _____. (a) 1 (b) 2 (c) 11 (d) 12
Why this question: Ionic Equilibria → MCQ: pH/pOH of a strong acid/base — appeared 3× Board 2024Board 2026
Q8.1 mark
Schottky defect is NOT observed in _____. (a) NaCl (b) KCl (c) AgBr (d) NiO
Why this question: Solid State → Schottky defect (define/consequences/where absent) — appeared 3× Board 2022Board 2025Board 2026
Q9.1 mark
Anisole reacts with HI at 398K to form: (a) cyclohexanol (b) benzenol (c) iodobenzene (d) benzene
Why this question: Alcohols, Phenols and Ethers → Action of reagents on named ethers (cleavage/substitution) — appeared 3× Board 2022Board 2025Board 2026
Q10.1 mark
The relation between edge length and radius for body centered cubic structure is: (a) r=a/2 (b) r=sqrt(3)a/4 (c) r=sqrt(2)a/4 (d) r=sqrt(3)a/2
Why this question: Solid State → MCQ: relation between radius and edge length — appeared 3× Board 2023Board 2024Board 2026
Q11.1 mark
Write name of monomer used to form nylon-6 polymer.
Why this question: Introduction to Polymer Chemistry → Nylon-6 preparation/monomer — appeared 4× Board 2024Board 2025Board 2026
Q12.1 mark
When 6.0g of O2 reacts with ClF as per 2ClF(g)+O2(g)->Cl2O(g)+OF2(g), the enthalpy change is 38.55 kJ. Calculate the standard enthalpy of the reaction.
Why this question: Chemical Thermodynamics → Numerical: enthalpy using Hess's law / enthalpies of formation — appeared 4× Board 2022Board 2024Board 2025
Q13.1 mark
Write the product formed when alkyl halide reacts with silver nitrite.
Why this question: Halogen Derivatives → Action of reagents on bromoethane/ethyl bromide — appeared 4× Board 2022Board 2024Board 2026
Q14.1 mark
Write formula to calculate percent (%) atom economy of particular reaction.
Why this question: Green Chemistry and Nanochemistry → Atom economy (formula/definition) — appeared 3× Board 2025Board 2026
Q15.1 mark
Write the electronic configuration of Zn+2 ion. (Atomic number of zinc is 30).
Why this question: Transition and Inner Transition Elements → Electronic configuration of transition/inner-transition element — appeared 3× Board 2024Board 2025Board 2026
Q16.1 mark
Complete the following reaction: CH3-CO-NH2 (acetamide) + 4(H) --Na/C2H5OH, LiAlH4/ether--> ? + H2O
Why this question: Amines → Reduction of acetamide to ethylamine — appeared 3× Board 2023Board 2025Board 2026
Q17.1 mark
Draw the structure of perchloric acid.
Why this question: Elements of Groups 16, 17 and 18 → Draw structures of named oxoacids — appeared 3× Board 2023Board 2025Board 2026
Q18.1 mark
Complete the reaction: CH3CH2Cl + ? ->
Why this question: Halogen Derivatives → Complete/identify products in haloalkane formation reactions — appeared 3× Board 2024Board 2025
Section BShort answer questions, 2 marks each (attempt any 8 of 12)
Q19.2 marks
When gold crystallizes, it forms face-centered cubic cells. The unit cell edge length is 4x10-8 cm. Calculate the density of gold. Molar mass of gold is 197 g mol-1.
Why this question: Solid State → Numerical: density / lattice type from edge length — appeared 6× Board 2022Board 2023Board 2024Board 2025
Q20.2 marks
What is the action of following reagents on ethyl amine? (Indicate by reaction) (a) Nitrous acid (b) Chloroform and KOH
Why this question: Amines → Action of reagents on ethylamine (carbylamine/nitrous acid/Hinsberg) — appeared 5× Board 2023Board 2024Board 2025Board 2026
Q21.2 marks
Write anomalous behaviour of oxygen with respect to: (i) Atomicity (ii) Oxidation state (iii) Magnetic property (iv) Nature of hydrides.
Why this question: Elements of Groups 16, 17 and 18 → Anomalous behaviour of oxygen — appeared 4× Board 2023Board 2024Board 2025Board 2026
Q22.2 marks
Explain aldol condensation reaction with respect to ethanal.
Why this question: Aldehydes, Ketones and Carboxylic Acids → Aldol condensation of ethanal/acetone — appeared 4× Board 2022Board 2023Board 2025Board 2026
Q23.2 marks
Derive an expression to calculate molar mass of non volatile solute by osmotic pressure measurement.
Why this question: Solutions → Determine molar mass from a colligative property (derive/explain) — appeared 4× Board 2022Board 2023Board 2024Board 2026
Q24.2 marks
Write two principles of green chemistry.
Why this question: Green Chemistry and Nanochemistry → Define green chemistry / its principles — appeared 4× Board 2022Board 2023Board 2024Board 2026
Q25.2 marks
How many coulombs of electricity is required to produce 1g of sodium metal by reduction of sodium ion?
Why this question: Electrochemistry → Numerical: Faraday's laws (mass/time/current/charge) — appeared 4× Board 2022Board 2024Board 2025
Q26.2 marks
Write salient features of SN1 mechanism.
Why this question: Halogen Derivatives → SN1/SN2 mechanism (features/mechanism) — appeared 3× Board 2024Board 2025Board 2026
Section CShort answer questions, 3 marks each (attempt any 8 of 12)
Q27.3 marks
(a) What is Lanthanoid contraction? (b) Compounds of 'd' block elements are coloured in solid state as well as in an aqueous state. Explain.
Why this question: Transition and Inner Transition Elements → Explain colour of transition metal ions/compounds — appeared 3× Board 2024Board 2025Board 2026
Q28.3 marks
(a) Explain Cannizzaro's reaction with the help of benzaldehyde. (b) Write the reaction for the conversion of cyclohexene to adipic acid.
Why this question: Aldehydes, Ketones and Carboxylic Acids → Cannizzaro reaction — appeared 3× Board 2024Board 2025Board 2026
Q29.3 marks
(i) Define: Common ion effect. (ii) Write preparation of glucose from starch.
Why this question: Ionic Equilibria → Define ionic-equilibria terms & solubility-Ksp relation — appeared 3× Board 2023Board 2025Board 2026
Q30.3 marks
Convert the following: (a) Acetic acid to ethyl alcohol (b) Acetic acid to acetic anhydride (c) Acetyl chloride to acetamide
Why this question: Aldehydes, Ketones and Carboxylic Acids → Conversions among carboxylic-acid compounds — appeared 3× Board 2023Board 2025Board 2026
Q31.3 marks
(a) Write the representation of sodium hexacyanoferrate (III). (b) Write type of hybridization and magnetic behaviour of: (i) [Co(NH3)6]3+ (ii) [NiCl4]2-
Why this question: Coordination Compounds → Formation of [Co(NH3)6]3+ by VBT — appeared 3× Board 2024Board 2025
Q32.3 marks
(i) What is peptide linkage? (ii) Write general characteristics of interhalogen compounds.
Why this question: Biomolecules → Formation of peptide bond/linkage — appeared 3× Board 2022Board 2025Board 2026
Q33.3 marks
Define conjugate acid-base pair. The hydroxyl ion concentration in aqueous solution of NaOH is 2x10-4 mol dm-3. Calculate pH of the solution.
Why this question: Ionic Equilibria → Numerical: interconvert pH/pOH/[H+]/[OH-] — appeared 3× Board 2023Board 2025
Q34.3 marks
Define half life of first order reaction. Obtain the expression for half life and rate constant of the first order reaction.
Why this question: Chemical Kinetics → Derive half-life / rate-constant relation for first order — appeared 3× Board 2022Board 2024Board 2025
Section DLong answer questions, 4 marks each (attempt any 3 of 5)
Q35.4 marks
(a) Derive relationship between dH and dU for a gaseous chemical reaction. (b) Give reason - Ozone is a good bleaching agent. (c) Write any two uses of SO2.
Why this question: Chemical Thermodynamics → Derive relation between dH and dU — appeared 3× Board 2023Board 2025Board 2026
Q36.4 marks
Define: (a) Standard enthalpy of combustion (b) Enthalpy of atomization. Draw the structure of D-ribose sugar. Write the uses of bronze alloy.
Why this question: Chemical Thermodynamics → Define thermodynamic terms — appeared 3× Board 2024Board 2026
Q37.4 marks
(a) Define: (i) Co-ordination numbers (ii) Ambidentate ligand (b) Write a note on Clemmensen reduction of propanone.
Why this question: Coordination Compounds → Define coordination terms (coordination number/ligand types) — appeared 3× Board 2022Board 2025Board 2026