Maharashtra HSC Class 12 Chemistry February 2026 question paper with answers

Section A

1 mark each

Select and write the correct answer for the following multiple choice type of questions :
Q.1 (i)1 mark $\mathrm{H_2 - O_2}$
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Q.1 (ii)1 mark $\mathrm{HOBrO_2}$
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Q.1 (iii)1 mark $Acetonitrile may be prepared by heating the following reactants :$
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Q.1 (iv)1 mark $The carbonated water is an example of _____.$
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Q.1 (v)1 mark $-$
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Q.1 (vi)1 mark $A system releases 10 kJ of heat and performs 15 kJ of work on the surrounding. Hence the change in internal energy is :$
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Q.1 (vii)1 mark $\mathrm{[Co(NH_3)_5(NO_2)]^{2+}}$
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Q.1 (viii)1 mark $The correct order for basic strength of amines and ammonia is _____.$
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Q.1 (ix)1 mark $Amongst the following 3d-series elements, having highest value of first ionization enthalpy is _____.$
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Q.1 (x)1 mark $The pOH of 0.01 M HCl solution is _____.$
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Answer the following questions :
Q.2 (i)1 mark $Write the name of product obtained, when selenium is treated with magnesium metal.$
Q.2 (ii)1 mark $Write the SI unit of cell constant.$
Q.2 (iii)1 mark $Write the name of radioactive element in lanthanide series.$
Q.2 (iv)1 mark $+\ 3\,\mathrm{H_2} \xrightarrow[433\mathrm{K}]{\text{Nickel}}\ ?$
Q.2 (v)1 mark $\mathrm{{-}CHO}$
Q.2 (vi)1 mark $Copper has fcc structure with edge length 495 pm. What is the radius of copper atom in pm?$
Q.2 (vii)1 mark $Write the chemical name of Teflon.$
Q.2 (viii)1 mark $Write the name of nanoparticle which acts as highly effective bacterial disinfectant.$

Section B

2 marks each · attempt any 8

Q.32 marks $Define : (a) Isomorphism (b) Unit Cell$
Q.42 marks $Explain the trends in the following properties of group 17 elements : (i) Atomic radii (ii) Electronegativity$
Q.52 marks $Explain Homoleptic and Heteroleptic complexes with example.$
Q.6 (i)2 marks $Write the reaction of bromine water on glucose.$
Q.6 (ii) $Define - Enantiomers$
Q.7 (i)2 marks $Write example of one dimensional nanostructure of size less than 100 nm.$
Q.7 (ii) $Write the hydrolysis reaction of ethyl methyl ether.$
Q.82 marks $R = 0.08205\ \mathrm{dm^{3}\ atm\ K^{-1}\ mol^{-1}}$
Q.92 marks $Write the mathematical equation of first law of thermodynamics for following processes : (a) Isochoric process (b) Adiabatic process$
Q.102 marks $Write two similarities and two differences between lanthanoids and actinoids.$
Q.112 marks $\mathrm{HNO_3}$
Q.122 marks $Explain Cannizzaro reaction with suitable example.$
Q.132 marks $\mathrm{NO_2Cl_{(g)} \xrightarrow{slow} NO_{2(g)} + Cl_{(g)}}$
Q.142 marks $\mathrm{Cu^{2+}}$

Section C

3 marks each · attempt any 8

Q.15 (i)3 marks $Derive relationship between relative lowering of vapour pressure and molar mass of non volatile solute.$
Q.15 (ii) $Write statement of second law of thermodynamics.$
Q.16 (i)3 marks $Convert, acetamide into ethyl amine.$
Q.16 (ii) $Explain amphoteric nature of water.$
Q.17 (i)3 marks $Convert the following : (i) Ethanol into sodium ethoxide. (ii) Phenol into o-phenol sulfonic acid.$
Q.17 (ii) $Convert : Bromomethane into methoxyethane.$
Q.18 (i)3 marks $What is peptide linkage?$
Q.18 (ii) $Write general characteristics of interhalogen compounds.$
Q.19 (i)3 marks $\mathrm{Ti^{3+}}$
Q.19 (ii) $Define Green chemistry.$
Q.20 (i)3 marks $Write examples of coordination metal complexes in biology.$
Q.20 (ii) $\mathrm{SO_2}$
Q.21 (i)3 marks $Write the formula to measure % atom economy according to green chemistry.$
Q.21 (ii) $Convert : (a) Benzene into benzaldehyde (b) Cyclohexene into adipic acid$
Q.22 (i)3 marks $Write a reaction for preparation of Nylon-6.$
Q.22 (ii) $\mathrm{Sc^{3+}}$
Q.23 (i)3 marks $Write the postulates of Werner's theory of co-ordination complexes.$
Q.23 (ii) $What is the action of ethane - 1, 2 - diol on acetone?$
Q.24 (i)3 marks $Write Tollen's reagent test for acetaldehyde.$
Q.24 (ii) $Write the structure of zwitter ion of sulfanilic acid. Write the reaction between benzene diazonium chloride and phenol in alkaline medium.$
Q.25 (i)3 marks $Define : Common ion effect.$
Q.25 (ii) $Write preparation of glucose from starch.$
Q.26 (i)3 marks $Draw the structure of 2, 4 - dinitrophenylhydrazone of acetaldehyde.$
Q.26 (ii) $\mathrm{A + B \rightarrow P}$

Section D

4 marks each · attempt any 3

Q.27 (i)4 marks $Define : Isotonic solution$
Q.27 (ii) $Define : Molecularity of reaction$
Q.27 (iii) $State and explain Hess's law of constant heat summation.$
Q.28 (i)4 marks $Define : (a) Schottky defect (b) Ferromagnetism$
Q.28 (ii) $(ii) Write the name of catalyst used in preparation of HDP. (iii) Draw structure of isoprene unit of natural rubber.$
Q.29 (i)4 marks $\mathrm{Fe^{2+}}$
Q.29 (ii) $(ii) Draw neat and labelled diagram of lead accumulator. (iii) Write two advantages of hydrogen - oxygen fuel cell.$
Q.30 (i)4 marks $Convert, ethanoic acid to ethanol.$
Q.30 (ii) $Explain the mechanism of alkaline hydrolysis of bromomethane.$
Q.31 (i)4 marks $Acetic acid is 5% ionised in its decimolar solution. Calculate the dissociation constant of acetic acid.$
Q.31 (ii) $\mathrm{H_2SO_4}$