Punjab Board Class 11 Chemistry Chapter 2025

Roll No.

Class-10+1

Paper Chemistry

Time: 3 hrs.

M.M. 70

Instructions:

Multiple Choice Questions:- One mark questions.

1. (1) Helium belongs to

   • (a) Group I
   • (b) Group II
   • (c) Group 17
   • (d) Group 18

2. (2) What is the formula of Acetic acid.

   • (a) HCHO
   • (b) \(CH_{3}COOH\)
   • (c) \[CH_{4}\]
   • (d) \[C_{2}H_{5}OH\]

3. (3) Unit of mole fraction is

   • (a) mol \(L^{-1}\)
   • (b) mol kg^-1
   • (c) moles
   • (d) unitless

4. (4) The number of significant figures in 3.0038 is

   • (a) 06
   • (b) 05
   • (c) 04
   • (d) 03

5. (5) The electronic configuration of Cl^- is

   • (a) \([Ne]3s^{2}3p^{5}\)
   • (b) \([Ne]3s^{2}3p^{4}4s^{1}\)
   • (c) \([Ne]3s^{2}3p^{4}\)
   • (d) \([Ne]3s^{2}3p^{6}\)

6. (6) Oxidation involves

   • (a) Gain of electron
   • (b) loss of electron
   • (c) Removal of oxygen
   • (d) All of these

7. (7) The functional group - CHO is represented as

   • (a) ol
   • (b) al
   • (c) oic acid
   • (d) None of these

8. (8) \(Na^{+}\) is isoelectronic with

   • (a) \(Mg^{2+}\)
   • (b) O
   • (c) Cl^-
   • (d) O^2-

9. (9) The IUPAC name for the structural formula

                               Cl
   
                               |
   
                           C---C
   
                           |   |
   
                           C---C
   
                           

   • (a) Chlorobenzene
   • (b) Trichlorobenzene
   • (c) 1, 3, 5 Trichlorobenzene
   • (d) 1, 3, 5 benzene

10. (10) The tendency towards complex formation is maximum in

    • (a) d-block elements
    • (b) S block elements
    • (c) P-block elements
    • (d) Noble gases

True/False:-

11. The open cup of tea is open system.
12. \(Fe^{3+}\) ion has four unpaired electrons.
13. Fluorine has highest electron gain enthalpy.
14. Isomerism has same molecular formula.
15. Alkynes having general formula is C_nH_2n.

Read the passage and answer the following questions :-

The substances are classified into electrolytes and non-electrolytes based on their ability to conduct electricity.

The substances like Sodium Chloride which conduct electricity in their aqueous solution are called electrolytes. The compounds which do not conduct electricity are known as non-electrolytes. Electrolytes further classified into strong and weak electrolytes. HCl is strong electrolyte and \(CH_{3}COOH\) is weak electrolytes. The equilibrium between a dissolved undissociated molecules and its ions is known as dissociation equilibria.

16. Give one example of strong electrolyte?
17. What is electrolytes?
18. What is non-electrolytes?
19. Give one example of weak electrolyte?
20. What is dissociation equilibria?

(20 × 1 = 20)

Two marks questions:-

2. What is periodicity? Give its cause with example?
3. Give difference between orbit and orbital?
4. Why is radius of cation is more than parent atom?
5. What is the oxidation number of sulphur is
   • (a) \(H_{2}SO_{4}\)
   • (b) \(Na_{2}S_{2}O_{3}\)

Three marks questions :-

6. Define Law of constant proportion with example?
7. What is Hund's rule give example?
8. What is intensive property give example?
9. Noble gases elements has zero electron gain enthalpy. Give reason?
10. What is zero law of Thermodynamics.
11. Give difference between oxidation number and valency?
12. Give the electronic configuration :-
    • (a) Zinc
    • (b) Potassium
13. What is Lewis acid give example?
14. Draw the Lewis dot structure.
    • (a) O₂
    • (b) Cl^-
15. A commercially available sample of sulphuric acid is 15% H₂SO₄ by weight (density = 1.10 g ml^-1). Calculate the molarity of the solution.

(14 × 2 = 28)

Five marks question :-

16. Draw the shapes of d orbitals.
17. With the help of VSEPR theory explain geometry, bond angle and hybridization in the following:-
    • (a) NH₃
    • (b) SF₆
18. A compound on analysis was found to contain the following composition
    • Na = 14.31%
    • S = 9.97%
    • O = 69.50%
    • H = 6.22%
    molecular mass of compound is 322. Calculate the molecular formula of the compound
19. Identify the oxidation, reduction oxidizing and reducing agent in following reaction:-

    H₂S + HNO₃ → NO + S + H₂O

20. Draw the energy level diagram of O₂ molecule and also calculate the bond order and their magnetic property?
21. 1. Explain the inductive effect with types.
    2. Give difference between Electrophile and Nucleophile

    OR

    1. Draw the structure of Alkane, Alkene, Alkyne.
    2. Give IUPAC names of the following compounds.

       1.                                         Br
          
                                                  |
          
                                              C - C
          
                                              |
          
                                              CH3
          
                                              

       2.                                         O
          
                                                  ||
          
                                              C
          
                                             / \
          
                                            /   \
          
                                           C---C
          
                                          / \ / \
          
                                         C---C
          
                                              

(5 × 2 = 10)