MBOSE Class 11 Question Paper 2022 for Chemistry

Total No. of Printed Pages ––10 (2)
HS/XI/Sc/Ch/22
PART –– I
2022

Choose the correct answer: 1 5 = 5
CHEMISTRY
1. Which of the following set of quantum numbers are
( Theory ) not possible. 1

Full Marks : 70 (a) n  1, l  0, M l  0, M s   12

Time : 3 hours
(b) n  1, l  1, M l  0, M s   12
General Instructions :
(c) n  2, l  1, M l  0, M s   12
(i) All questions are compulsory.

(ii) Question No. 1 to 5 are multiple choice questions (d) n  2, l  0, M l  0, M s   12
carrying 1 mark each.

(iii) Question No. 6 to 10 are very short answer questions
carrying 1 mark each.
2. In the modern periodic table, the period indicate the
(iv) Question No. 11 to 17 are short answer questions value of 1
carrying 2 marks each.

(v) Question No. 18 to 26 are long answer questions (a) Atomic number
carrying 3 marks each.
(b) Atomic mass
(vi) Question No. 27 is a value based answer question
carrying 4 marks.
(c) Principal quantum number
(vii) Question No. 28 to 30 are very long answer questions
carrying 5 marks each.
(d) Spin quantum number
(viii) If necessary simple calculator and log table can be
used.

HS/XI/Sc/Ch/22 HS/XI/Sc/Ch/22

(3) (4)

3. A Thermodynamic state function is a quantity 1 PART –– II

(a) Used to determine heat changes
6. Define Modern Periodic Law 1
(b) Whose value is independent of path

(c) Used to determine pressure volume work 7. Distinguish between a  (sigma) and a  (pi) bond. 1

(d) Whose value depends on temperature only
8. What is disproportionation reaction? 1

4. Which one of the alkaline earth metal carbonates is 9. Name the different allotropes of carbon. 1
thermally the most stable? 1
(a) MgCO3 10. Why is the small drops of mercury form spherical bead
instead of spreading on the surface. 1
(b) CaCO3

(c) SrCO3
PART –– III
(d) BaCO3
11. A compound contain 4.07% hydrogen, 24.27% carbon
and 71.65% chlorine. Its molar mass is 98.96g. What
5. The reaction: 1 are its empirical and molecular formula? 2
CH3CH2I  KOH(aq)  CH3CH2OH  KI
is classified as 12. The threshold frequency vo for a metal is 7.0  1014 s 1 .
Calculate the kinetic energy of an electron emitted
(a) Electrophilic substitution
when radiation of frequency v  1.0  1015 s 1 hits the
(b) Nucleophilic substitution metal. 2

(c) Elimination 13. Explain why cations are smaller and anions larger in
radii than their parent atoms? 2
(d) Addition

HS/XI/Sc/Ch/22 HS/XI/Sc/Ch/22

(5) (6)

14. Derive equation, PART –– IV
pV = nRT

Where the symbols carry usual meaning. 2 18. Either

(a) Write the electronic configuration of Cu(At no. 29) 1

(b) Account for the stability of completely filled and
15. Either
half filled subshells 2
Which out of NH3 and NF3 has higher dipole moments Or
and why? 2
Give the postulates of Bohr’s model of hydrogen
Or atom. 3

Define hydrogen bond. Is it weaker or stronger than
the van der Waals forces? 2
19. Define hybridisation? Explain the structure of C2H4
molecule on basis of hybridisation. 3

16. What causes the temporary and permanent hardness 20. Derive the relationship between Cp and Cv for an ideal
of water? 2 gas. 3

21. (a) State Le Chatelier’s principle. 1
17. Either

What are electrophiles and nucleophiles? Explain with (b) For the equilibrium 2
example. 2 2NOCl(g) 2NO(g)  Cl2 (g)
Or
the value of the equilibrium constant K c is
Define Hyperconjugation with suitable example. 2 3.75  10 6 at 1069K. Calculate Kp for the reaction
at this temperature?

HS/XI/Sc/Ch/22 HS/XI/Sc/Ch/22

(7) (8)

22. Either 25. (a) Define functional group isomerism with example. 1
(a) On the basis of molecular Hydride classify the
following compound as electron deficient, electron (b) Differentiate between distillation under reduced
precise and electron rich hydrides. 2 pressure and steam distillation. 2
B2H6, CH4, H2O and NH3.

(b) What are amphoteric oxide? Give example. 1
26. Either
Or

(c) Starting from Borax, how Boric acid is prepared? (a) Define ozonolysis with example. 2
Give balance chemical equation. 2
(d) What happen when Al is treated with dilute NaOH (b) How benzene is prepared from phenol? Give
solution? 1 chemical equation. 1

Or

23. (a) Calculate the oxidation number of sulphur (s) in (c) What are ortho-para directing group? Explain
with example 1
½ 2 = 1
(i) H 2S 4O 6

(ii) Na2S2O3 (d) Write the product of the following reaction

(b) Balance the following redox reaction by any
Mo O
method. 2 (i) CH4  O2   
2 3
1

Cr2O72  SO2 (g)  Cr 3 (aq)  SO42 (aq) (acid medium)

Anhyd. A lCl
(ii)  6Cl 2  dark,
  3
 1
cold
24. (a) Name the different isotopes of Hydrogen. 1

(b) Calculate the mass of a photon with wavelength
3.6A0. 2

HS/XI/Sc/Ch/22 HS/XI/Sc/Ch/22

(9) ( 10 )

PART – V 29. (a) Give Chemical equation to show
(i) The amphoteric nature of H2O 1 12
27. As an individual who is responsible for protecting the (ii) The oxidising property of H2O2 1 12
environment, what measure would you take to reduce
environmental pollution in your locality. 4
(b) What is “dead burnt plaster”? 1

28. Either (c) List out two uses of quicklime. 1

(a) Derive the relation
ΔG  ΔH  TΔS  0 2
30. (a) What is hydrogenation reaction? Give example. 1
(b) What are extensive and intensive properties of a
(b) What is heterolytic cleavage? 1
system? Cite example. 2

(c) Draw the newman projection formula of Ethane. 1
(c) What is bond dissociation enthalpy (hexa H ) 1
(d) Give the mechanism of addition of
Or
HBr to CH3  C  C  CH3 2
(d) The combustion of one mole of benzene takes H CH3
place at 298 K and 1 atm. After combustion,
CO2(g) and H2O(l) are produced and 3267.0 kJ of
heat is liberated. Calculate the standard enthalpy
of formation (Δ f H ) of benzene Standard enthalpy 

of formation of CO2 (g ) and H2O(1) are –393.5 kJ/
mol and –285.83 kJ/mol respectively. 3

(e) How temperature affects the spontaneity of a
chemical reaction? 2

HS/XI/Sc/Ch/22 HS/XI/Sc/Ch/22