School Code- 70334 Affiliation No.

– 2132838

ST. JOSEPH’S SR. SEC. SCHOOL

BHATPAR RANI
ANNUAL EXAMINATION 2024 -25
CLASS – 11 SUBJECT – CHEMISTRY MM – 70 TIME – 3HRS
Note: Attempt all questions.
Section – A (1 marks each)
1. In group, reason of periodicity is
a. Same number of electrons in their atom c. same ionization potential
b. Same valence shell electronic configuration d. electrons present in the same subshells
2. The IUPAC name of the element having atomic number 106 will be:
a. Unnilpentium b. Unnilquadium c. Unnilhexium d. Ununnilium
3. The structure of IF7 is :
a. Octahedral b. pentagonal bipyramidal c. square pyramidal d. trigonal bipyramidal
4. Which of the following has linear shape
a. CO2, SO2 b. CO2, BeCl2 c. SO2, BeCl2 d. BeCl2, SnCl2
5. Which one of the following molecules is expected to exhibit diamagnetic behaviour?
a. B2 b. N2 c. O2 d. S2
6. The resonance is shown by
a. CO3-2 b. NO3- c. O2 d. Both (1) & (2)
7. Born Haber cycle is mainly used to determine
a. Lattice energy b. Electron affinity c. ionization energy d. electronegativity
8. Thermodynamics is not concerned about
a. Energy changes involved in a chemical reaction c. the feasibility of a chemical reaction
b. The extent to which a chemical reaction proceeds d. the rate at which a reaction proceeds.
9. We know the relationship between Kc and Kp is Kp = Kc(RT) ∆n. What would be the value of ∆n for the
reaction NH4Cl(s) ⇌NH3(g) + HCl (g)
a. 2 b. 1 c. 0.5 d. 1.5
10. Identify the disproportionation reaction
a. CH4 + 2O2 → CO2 + 2H2O c. CH4 + 4Cl2 → CCl4 + 4HCl
b. 2F2 + 2OH →2F + OF2 + H2O
- -
d. 2NO2 + 2 OH- → NO2- + NO3- + H2O
11. The order of reactivity of halogens towards alkynes is
a. Cl2> I2 Br2 b. I2> Br2>Cl2 c. Cl2>Br2>I2 d. Br2>Cl2>I2
12. Which of the following id ortho and para directing activators from the following
a. -OH b. -CH3 c. -NH2 d. All of these
13. The element with atomic number 57 belongs to
a. S- block b. p- block c. d- block d. f-block
14. Stable form of Chlorine may be represented as
a. Cl b. Cl2 c. Cl3 d. Cl4
15. Number of π bonds and σ bonds in the following structure is :
a. 6, 19 b. 4, 20 c. 5, 19 d. 5, 20
 16. The IUPAC name for

a. 1-Hydroxypentane-1,4-dione c. 1,4-Dioxopentanol
b. 1- Carboxybutane-3-one d. 4-Oxopentanoic acid
17. The electronic configuration of metal M is 1s 2s 2p63s1. The formula of oxide will be
2 2

a. MO b. M2O c. M2O3 d. MO2

Question No. 18 to 20 consist of two statements – Assertion and Reason. Answer these questions
selecting the appropriate option given below:
a) Both Assertion and Reason are true, and reason is the correct explanation of Assertion.
b) Both Assertion and Reason are true, and Reason is not the correct explanation of Assertion.
c) Assertion is true but Reason is false.
d) Assertion is false but reason is true.
18. Assertion: For Adiabatic process, if expansion occurs then the temperature of the system rises.
Reason: For adiabatic process, heat change is zero during the process.
19. Assertion: H2SO4 cannot act as reducing agent.
Reason: Sulphur cannot increase its oxidation state beyond +6.
20. Assertion: In H2CC=CH2, all of the carbon atom atoms are sp2 hybridized.
Reason: All of the carbon atoms in this molecule are linked together by double bonds.
Section – B (2 marks each)
21. Extensive properties depend on the quantity of matter but intensive properties do not. Tabulate the given
properties as extensive and intensive: Mass, internal energy, pressure, heat capacity, density, mole fraction.
22. Complete the following reaction:
a. CH3 - C≡C-CH3 Na, liq. NH3 A. b. CH3-C≡CH + H2O H2SO4(dil) / HgSO4 A Isomerisation B
23. Explain the test of unsaturation.
24. If 500ml of 5M solution is diluted to 1500mL, what will be the molarity of the solution obtained?
25. What is the difference between molarity and molality?
26. Predict the change in internal energy for an isolated system at constant volume.
27. Calculate the oxidation number of phosphorous in the following species: a) HPO 3-2 b) PO43-
28. Define aromatic compounds.
29. What are electrophiles and Nucleophiles?
30. Write the order of stability of carbocation.
Section – C (3 marks each)

31. Write the difference between electromeric effect and isomeric effect.
32. Write a note on electrophilic substitution reaction.
33. A 5liter cylinder contained 10 mol of oxygen gas at 27°C. Due to sudden leakage through the hole, all the gas
escaped into the atmosphere and the cylinder got empty. If the atmosphere pressure is 1.0 atm. Calculate the
work done by the gas? (R=0.083 lit atm mol-1K-1)
34. How will you convert benzene into
a. p-nitrobromobenzene b. m-Nitrochlorobenzene
35. What is Huckel rule?
Section – D (5 marks each)
36. Explain Markovnikov rule with mechanism.
37. Explain the Mechanism of Friedel – Craft- Alkylation of benzene.
38. Explain the electrophilic substitution reaction by giving the mechanism of nitration of benzene.