Maharashtra Board Class 12 Chemistry Guess Paper 2027
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
(i) Write observed electronic configuration of chromium (Z=24). (ii) Calculate magnetic moment of Ti3+ by using spin only formula (Z of Ti=22). (iii) Define Green chemistry.
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
(a) Write cell reactions of hydrogen-oxygen fuel cell at anode and cathode. (b) Write an application of electrochemical series.
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
(i) Define: (a) Schottky defect (b) Ferromagnetism (ii) Write the name of catalyst used in preparation of HDP. (iii) Draw structure of isoprene unit of natural rubber.
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
(i) Write a reaction for preparation of Nylon-6. (ii) The salt of Sc3+ ion is colourless and the salt of Mn3+ ion is coloured. Explain. [Z of Sc=21 and Z of Mn=25]
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
(a) What is the action of following reagents on Bromoethane? (i) KNO2 (ii) 'Mg' metal (iii) Silver acetate (b) Draw structure - DDT insecticide.
Why this question: Halogen Derivatives → Action of reagents on bromoethane/ethyl bromide — appeared 4× Board 2022Board 2024Board 2026
Q14.1 mark
(i) Write the formula to measure % atom economy according to green chemistry. (ii) Convert: (a) Benzene into benzaldehyde (b) Cyclohexene into adipic acid.
Why this question: Green Chemistry and Nanochemistry → Atom economy (formula/definition) — appeared 3× Board 2025Board 2026
Q15.1 mark
(a) Write chemical reactions taking place during extraction of iron in zone of reduction of the blast furnace. (b) Write observed electronic configuration of gadolinium. (Z=64)
Why this question: Transition and Inner Transition Elements → Electronic configuration of transition/inner-transition element — appeared 3× Board 2024Board 2025Board 2026
Q16.1 mark
(i) Convert acetamide into ethyl amine. (ii) Explain amphoteric nature of water.
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 following reactions: (i) CH3-CH=CH2 + HBr -> ? (ii) C2H5OH + SOCl2 --(heat)--> ?
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
(a) Explain anomalous behaviour of oxygen with respect to (i) Atomicity (ii) Magnetic property (iii) Oxidation state (iv) Nature of hydride (b) Write any two uses of helium.
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
(a) State Raoult's law. (b) Derive the relationship to determine molar mass of non volatile solute by depression of freezing point.
Why this question: Solutions → Determine molar mass from a colligative property (derive/explain) — appeared 4× Board 2022Board 2023Board 2024Board 2026
Q24.2 marks
(a) Mention the names of four principles of green chemistry. (b) Write advantages of nanoparticles and nanotechnology in the field of energy sector.
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
(i) Convert ethanoic acid to ethanol. (ii) Explain the mechanism of alkaline hydrolysis of bromomethane.
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) Write general electronic configuration of 3d series elements. (b) Write any two points which explain about the colour of a transition metal ion.
Why this question: Transition and Inner Transition Elements → Explain colour of transition metal ions/compounds — appeared 3× Board 2024Board 2025Board 2026
Q28.3 marks
Explain Cannizzaro reaction with suitable example.
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) 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
Q32.3 marks
Define the following terms: (a) Intensive property (b) Standard enthalpy of combustion
Why this question: Chemical Thermodynamics → Define thermodynamic terms — appeared 3× Board 2024Board 2026
Q33.3 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
Q34.3 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
Section DLong answer questions, 4 marks each (attempt any 3 of 5)
Q35.4 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
Q36.4 marks
A solution has hydrogen ion concentration 0.01M. Calculate pOH of the same solution.
Why this question: Ionic Equilibria → Numerical: interconvert pH/pOH/[H+]/[OH-] — appeared 3× Board 2023Board 2025
Q37.4 marks
Write the mathematical equation of first law of thermodynamics for following processes: (a) Isochoric process (b) Adiabatic process
Why this question: Chemical Thermodynamics → First-law equations for named processes — appeared 3× Board 2022Board 2024Board 2026