Solved question paper for Chemistry Sep-2021 (PSEB Class 12th)

Solved Question Paper

Chemistry Sep-2021

PSEB • Class 12th • 1st • Sep-2021

Chemistry previous year question papers on BRpaper help students looking for PSEB 12th Class Question Papers to browse Chemistry papers for board exam practice and revision. This subject section is useful for finding PSEB 12th Chemistry old question papers, PYQ-style papers, and related exam-preparation material where available, so students can study the question format, recurring topics, and marks pattern used in the Punjab board exam. If you are preparing for the Punjab School Education Board Class 12 Chemistry paper, this page can help you compare past question styles with sample paper and model paper trends, and focus on important questions more confidently. BRpaper is not the official website of Punjab School Education Board or any institution, and it does not publish official notices or academic updates.

Solved Questions

Solved
  1. COMPREHENSION: Read the following passage and answer the questions1 to 5 given below
    The adsorption is reversible, if the adsorbate can be easily removed from the surface of the adsorbent by physical
    methods, if the adsorbate can not be removed from the surface of the adsorbent. It is called irreversible
    adsorption.Examples of irreversible adsorption are adsorption of oxygen and adsorption of CO on tungsten surface
    The substancesupon whose surface the change of concentration occurs, is called absorbent. The substance taken up
    on the surface iscalled adsorbate. The common surface between the two phases where the adsorbed molecules
    concentrate is called theinterface. Physical adsorption occurs when the adsorbate gas molecules are held by physical
    forces like Van der Waalsforces. Chemical adsorption occurs when the absorbate molecule is held on the adsorbent
    surface by chemical forces asshort covalent chemical bonding occurs by the sharing of electrons.

    Which of the following is true about Chemical adsorption :
    (a) Non Specific
    (b) Multi layer
    (c) reversible
    (d) Adsorbate molecules are held by chemical bonds

    Oxygen adsorbed on the surface of Tungsten is an example of :
    (a) Absorption
    (b) Chemical Adsorption
    (c) Physical adsorption
    (d) None of these

    If Tungstun adsorbs CO ,then in this case CO is :
    (a) Absorbate
    (b) Adsorbent
    (c) Initially adsorbate then adsorbent
    (d) None of these

    Which of the following is an example of absorption :
    (a) water on silica gel
    (b) water on anhydrous CaCl2
    (c) Hydrogen on Nickel
    (d) Oxygen on metal surface

    When the adsorbate molecules are held by van der waal forces , the adsorption is called as :
    (a) Physical Adsorption
    (b) Chemical adsorption
    (c) Both (a) and (b)
    (d) none of these
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  2. Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is.
    (a) 0.46
    (b) 0.40
    (c) 0.20
    (d) 0.36
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  3. Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression ?
    (a) KCl
    (b) C6H12O6
    (c) Al2(SO4)3
    (d) K2SO4
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  4. A commercially available sample of H2SO4 is 15%by weight ( density =1.10gmL-1)its molality will be:
    (a) 2.4m
    (b) 1.08m
    (c) 3.3m
    (d) 1.8m
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  5. Which of the following is Haematite:
    (a) Fe3O4
    (b) Fe2O3
    (c) CuO
    (d) FeS2
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  6. Which of the following is not a sulphide ore :
    (a) Galena
    (b) Iron pyrites
    (c) Magnetite
    (d) Copper glance
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  7. Molar conductivity of 0.15 M solution of KCl at 298 K , if its conductivity is 0.0152 Scm-1will be
    (a) 124 Scm2 mol-1
    (b) 204 Scm2 mol-1
    (c) 101 Scm2 mol-1
    (d) 300 Scm2mol-1
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  8. Standard electrode potential of Ni2+/Ni electrode, if the cell potential of the cell Ni|Ni2+( 0.01M) || Cu2+(0.1M)|Cu is 0.59 v given : E0Cu2+/Cu = 0.34V is
    (a) -0.2205V
    (b) 0.3205V
    (c) + 0.014 V
    (d) - 0.34V
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  9. A first order reaction takes 40 min for 30% completion .What will be its t1/2 :
    (a) 77.7 min
    (b) 52.5 min
    (c) 46.2min
    (d) 22.7 min
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  10. The rate constant for a reaction becomes double when temperature is raised from 270C to 370C .Iitsactivation energy will be :
    (a) 106.5 kJmol-1
    (b) 53.6 kJmol-1
    (c) 46.2kJmol-1
    (d) 98.7kJmol-1
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  11. The Increasing order of reducing power of the halogen acids is:
    (a) HF <HCI <HBr <HI
    (b) HI<HBr <HCI <HF
    (c) HBr <HCI <HF <HI
    (d) HCI < HBr <HF <H
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  12. The Hybridization of Xe in XeO2F4 is :
    (a) SP3
    (b) SP3d
    (c) SP3d2
    (d) SP3d3
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  13. Fluorine is the best oxidizing agent because of its :
    (a) Highest electron affinity
    (b) Highest reduction potential
    (c) lowest electron affinity
    (d) Highestoxidation potential
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  14. NCl5 does not exist because :
    (a) Nitrogen has high I.E
    (b) Small size
    (c) Absence of vacant d -orbitals
    (d) High electronegativity
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  15. In XeF2 has hybridization :
    (a) SP3
    (b) SP3d
    (c) SP3d2
    (d) SP3d3
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  16. H3PO2 is:
    (a) Monobasic
    (b) Dibasic
    (c) Tribasic
    (d) None of these
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  17. Which hydride of group 15 is most basic :
    (a) NH3
    (b) PH3
    (c) SbH3
    (d) AsH3
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  18. Out of the following which one has highest boiling point :
    (a) NH3
    (b) PH3
    (c) SbH3
    (d) AsH3
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  19. The first compound of Xe was :
    (a) Xe+2[ PtF6]
    (b) XeO2F4
    (c) XeO4
    (d) Xe[ PtF6]
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  20. Cause of lanthanoid contraction is :
    (a) increasing nuclear charge
    (b) decreasing nuclear charge
    (c) poor shielding effect of 4f subshell
    (d)increasing screening effect
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  21. The electronic configuration of Gd2+is (Z= 64 for Gd )
    (a) [Xe] 4f1
    (b) [Xe] 4f75d1
    (c) [Xe] 4f8
    (d) [Xe] 4f75d16s2
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  22. In which of the following case d-d transitions will occur ;
    (a) Cu+
    (b) Zn2+
    (c) Cu2+
    (d) Cd2+
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  23. The magnetic moment of a transition metal ion has been found to be 3.87 BM .It is probably
    (a) Fe3+
    (b) Cr3+
    (c) Ti2+
    (d) Ni2+
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  24. K2Cr2O7 is prepare from :
    (a) CrO5
    (b) FeO.Cr2O7
    (c) FeO.Cr2O3
    (d) K2CrO4
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  25. Out of the following which one is diamagnetic :
    (a) Cu2+
    (b) Fe2+
    (c) Zn2+
    (d) Mn2+
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  26. The products formed in the following reaction at 873K and 6-7 bar Xe + F2 ? are :(1 : 5)
    (a) XeF2
    (b) XeF4
    (c) XeF6
    (d) XeO2F4
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  27. The common oxidation state shown by lanthanoids is :
    (a) +1
    (b) +5
    (c) +3
    (d) +7 Q33.
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  28. [Pt (NH3)4 ] [CuCl4] and [Cu (NH3)4 ] [PtCl4] are :
    (a) Ionization isomers
    (b) Coordination isomers
    (c) linkage isomers
    (d) Hydrate isomers
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  29. Which of the following ligands form a chelate :
    (a) Acetate
    (b) Oxalate
    (c) Cyanide
    (d) Ammonia
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  30. IUPAC name of Na3 [ Fe (C2O4)3]
    (a) sodium trioxalatoferrous(III)
    (b) sodium trioxalatoferrate(III)
    (c) sodium trioxalatoferrate(II)
    (d) trisodiumtrioxalatoferrate(III)
    MCQ 1 Marks Sep-2021 • PSEB Class 12th
  31. Out of the following which one is not considered as transition element :
    (a) Cu
    (b) Ag
    (c) Au
    (d) Hg
    MCQ 1 Marks Sep-2021 • PSEB Class 12th

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01 How can I find PSEB 12th Chemistry previous year question papers for 1st semester on BRpaper?

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Yes. Students often use previous Chemistry papers on this page to review question style, section flow, recurring topic areas, and the overall structure seen in past Punjab board exams.

03 Are previous year Chemistry papers useful along with sample paper or model paper practice?

Yes. Previous year papers show real past exam style, while sample or model papers are commonly used for extra pattern-based practice. Using both can help with revision and time-based preparation.

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Past papers are often used to spot commonly tested areas in Chemistry, such as numericals and questions from organic, inorganic, or physical chemistry. They are helpful for setting revision priorities, not for guaranteeing exact repeats.

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This subject page is mainly for browsing previous year Chemistry question papers. If solution-based practice is available anywhere on the site, students should verify it on the page instead of assuming all papers include answers.

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Start by reviewing a few past Chemistry papers to understand the question pattern, then revise the chapters that appear frequently, practice numericals, and use the papers for timed self-testing before the exam.