MH 12th Question Paper March 2026 Chemistry

FOR MAHARASHTRA BOARD (MSBSHSE) CLASS 12 EXAM PREPARATION

Maharashtra Board
(MSBSHSE) Class 12
2026
March Session
Question Paper ·
Chemistry
EXAM YEAR

Maharashtra Board (MSBSHSE) Class 12 2026
TYPE SUBJECT

March Session Question Paper Chemistry

Notes · Sample Papers · Previous Year Papers · Mock Tests

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SEAT NUMBER
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DAY — 08 SEAT NUMBER

2026 II 18 1100 (E)
J-155 m
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s em CHEMISTRY (55)
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a Time : 3 Hrs. ( 8 Pages ) Max. Marks : 70

General Instructions :

The question paper is divided into four sections.

(1) Section A : Q. No. 1 contains Ten multiple choice type of
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questions carrying One mark each.
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Q. No. 2 contains Eight very short answer type
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of questions
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a 3 to Q. No. 14 are Twelve short answer
(2) Section B : Q. No.
type of questions carrying Two marks each.
(Attempt any Eight)

(3) Section C : Q. No. 15 to Q. No. 26 are Twelve short answer
type of questions carrying Three marks each.

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(Attempt any Eight)
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(4) Section D : Q. No. 27 to Q. No. 31 are Five long answer
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type of questions carrying Four marks each.

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a (5) Use of log table is allowed. Use of calculator is not allowed.

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(6) Figures to the right indicate full marks.

(7) For multiple choice type questions, only the first attempt
will be considered for evaluation.

(8) Physical constants :

(i) Avogadro Number = NA = 6.022 × 1023

(ii) Gas constant = R = 0.08206 L–atm. K–1. mol–1

(iii) 1 Faraday = F = 96500 Coulomb

SECTION - A

Q. 1. Select and write the correct answer for the following [10]
multiple choice type of questions :

(i) The electrolyte used in H2 – O2 fuel cell is _____.
(a) aqueous KCl (b) aqueous KOH
(c) aqueous HCl (d) aqueous KNO3

(ii) The oxidation state of bromine in HOBrO2 oxoacid is
_____.
(a) +7 (b) +5
(c) +3 (d) +1

(iii) Acetonitrile may be prepared by heating the following
reactants :
(a) Ethyl chloride with alcoholic KCN
(b) Ethyl chloride with alcoholic AgCN
(c) Methyl chloride with alcoholic KCN
(d) Methyl chloride with alcoholic AgCN

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(iv) The carbonated water is an example of _____.
(a) solid in liquid solution
(b) liquid in liquid solution
(c) gas in liquid solution
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(d) liquid in gas solution

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The unit of rate constant is per second, the order of
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a (b) First
(c) Second
(d) Third

(vi) A system releases 10 kJ of heat and performs 15 kJ of
work on the surrounding. Hence the change in internal
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energy is :

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(a) + 5 kJ
(c) + 25 kJ
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(vii)
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a complex ions [ Co(NH3 )5 (NO2 )]2
The co-ordination

and [ Co(NH3 )5 (ONO) ]2 are _____ of each other..
(a) ionization isomers
(b) solvate isomers
(c) linkage isomers
(d) co-ordination isomers
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(viii) The correct order for basic strength of amines and

e m ammonia is _____.
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las (a) a g
ag (b)
(c)
(d) NH3 R NH2 R2NH R3N

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(ix) Amongst the following 3d-series elements, having
highest value of first ionization enthalpy is _____.
(a) Zn (b) Cu
(c) Co (d) Sc

(x) The pOH of 0.01 M HCl solution is _____.
(a) 1 (b) 2
(c) 11 (d) 12

Q. 2. Answer the following questions : [8]

(i) Write the name of product obtained, when selenium is
treated with magnesium metal.

(ii) Write the SI unit of cell constant.

(iii) Write the name of radioactive element in lanthanide
series.

(iv) Complete the following reaction :

(v) Write the IUPAC name of :

(vi) Copper has fcc structure with edge length 495 pm. What
is the radius of copper atom in pm?

(vii) Write the chemical name of Teflon.

(viii) Write the name of nanoparticle which acts as highly
effective bacterial disinfectant.

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SECTION - B
Attempt any EIGHT of the following questions : [16]

Q. 3. Define :
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(a) Isomorphism
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(b) Unit Cell
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Q. 4. Explain the trends in the following properties of group 17

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elements :
a (i) Atomic radii
(ii) Electronegativity

Q. 5. Explain Homoleptic and Heteroleptic complexes with example.

Q. 6. (a) Write the reaction of bromine water on glucose.
(b) Define – Enantiomers

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Q. 7. (i) Write example of one dimensional nanostructure of size

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less than 100 nm.
(ii)
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Write the hydrolysis reaction of ethyl methyl ether.

Q. 8. a g
Calculate the osmotic pressure of solution containing 0.822 gm
of sucrose in 300 mL of water at 298 K.
[ Given : Molar mass of sucrose 342 g/mol, R = 0.08205 dm3.
atm. K–1. mol–1 ]

Q. 9. Write the mathematical equation of first law of thermodynamics

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for following processes :

m (a) Isochoric process
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m Q. 10.
(b) Adiabatic process
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Write two similarities and two differences between lanthanoids
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and actinoids.

Q. 11. What is the action of following reagents on chlorobenzene?
(i) conc. HNO3
(ii) fuming H2SO4

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Q. 12. Explain Cannizzaro reaction with suitable example.

Q. 13. A chemical reaction occurs in two steps :
(i)

(ii)

(a) Write down the rate law.
(b) Identify the reaction intermediate.

Q. 14. The standard potential of electrode Cu++ (0.02 M) | Cu(s) is 0.337
volt. Calculate its potential in volt.

SECTION - C
Attempt any EIGHT of the following questions : [24]

Q. 15. (i) Derive relationship between relative lowering of vapour
pressure and molar mass of non volatile solute.
(ii) Write statement of second law of thermodynamics.

Q. 16. (i) Convert, acetamide into ethyl amine.
(ii) Explain amphoteric nature of water.

Q. 17. Convert the following :
(i) Ethanol into sodium ethoxide.
(ii) Phenol into o-phenol sulfonic acid.
(iii) Bromomethane into methoxyethane.

Q. 18. (i) What is peptide linkage?
(ii) Write general characteristics of interhalogen compounds.

Q. 19. (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.

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Q. 20. (i) Write examples of coordination metal complexes in biology.
(ii) Calculate the work done in oxidation of 2 moles of SO2 at

298K, if

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[ Given : R = 8.314 J/K/mol ]
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Q. 21. (i)
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Write the formula to measure % atom economy according
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g l(ii)a Convert : ag
a (a) Benzene into benzaldehyde
(b) Cyclohexene into adipic acid

Q. 22. (i) Write a reaction for preparation of Nylon-6.
(ii) T h e sal t of Sc3+ ion is colourless and the salt of Mn3+ ion is
coloured. Explain.
[ Z of Sc = 21 and Z of Mn = 25 ]
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. theory of co-ordination
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Q. 23. (i) Write the postulates of Werner’s

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complexes.
(ii) What is the action g l
a of ethane –1, 2 – diol on acetone?
Q. 24. (i) Write Tollen’s reagent test for acetaldehyde.
(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) Define :
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Common ion effect.
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(ii) Write preparation of glucose from starch.
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(i) Draw the structure of 2, 4 – dinitrophenylhydrazone
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a (ii)
acetaldehyde.
The rate of is 3.6 × 10–2 mol/dm3/s. When [A] =
0.2 M and [B] = 0.1 M. Calculate the rate constant if
reaction is first order in B and second order in A.

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SECTION - D
Attempt any THREE of the following questions : [12]

Q. 27. (i) Define :
(a) Isotonic solution
(b) Molecularity of reaction
(ii) State and explain Hess’s law of constant heat summation.

Q. 28. (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.

Q. 29. (i) Calculate effective atomic number of Fe2 in [Fe(CN)6 ]4
[ Given : (Z = 26) ]
(ii) Draw neat and labelled diagram of lead accumulator.
(iii) Write two advantages of hydrogen – oxygen fuel cell.

Q. 30. (i) Convert, ethanoic acid to ethanol.

(ii) Explain the mechanism of alkaline hydrolysis of
bromomethane.

Q. 31. (i) Acetic acid is 5% ionised in its decimolar solution.
Calculate the dissociation constant of acetic acid.
(ii) Write chemical formula of epsom salt.
Give two uses of H2SO4.

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