Oswaal CBSE Sample Question Papers Class 12 Chemistry (For 2023 Exam)

206 Pages·35.53 MB·english

by  Oswaal Editorial Board

CHEMISTRY
( 1 )
15th EDITION
YEAR 2022-23

I S B N

“978-93-5634-356-6”

CENTRAL BOARD OF
SYLLABUS SECONDARY EDUCATION
COVERED DELHI
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DISCLAIMER
This book is published by Oswaal Books and Learning Pvt Ltd (“Publisher”) and is intended solely for educational use,
to enable students to practice for examinations/tests and reference. The contents of this book primarily comprise a
collection of questions that have been sourced from previous examination papers. Any practice questions and/or
notes included by the Publisher are formulated by placing reliance on previous question papers and are in keeping
with the format/pattern/guidelines applicable to such papers.
The Publisher expressly disclaims any liability for the use of, or references to, any terms or terminology in the book,
which may not be considered appropriate or may be considered offensive, in light of societal changes. Further, the
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Kindle (E 2d )ition
TABLE OF CONTENTS
l Latest CBSE Circular released on 20th May for Academic Year 2022-2023
(CBSE Cir. No. Acad 57/2022) 4 - 4
l Latest CBSE Syllabus released on 21st April 2022 for Academic Year 2022-2023
(CBSE Cir. No. Acad 48/2022) 5 - 10
l CBSE Solved Board Papers 2022 Term-II Examination (Delhi & Outside Delhi Sets) 13 - 24
(To download Solved paper for Term-I 2021-22 & Latest Topper’s Answers 2020, scan the QR Code
given on Page 24)
 Mind Maps 1 - 10
 On Tips Notes 11 - 46
 Sample Question Papers (Solved)
l Sample Question Paper - 1 (Issued by Board dated 16th Sep. 2022) 47 - 53
l Solutions of Sample Paper - 1 (CBSE Marking Scheme 2022-23) 54 - 58
l Sample Question Paper - 2 59 - 64
l Sample Question Paper - 3 65 - 69
l Sample Question Paper - 4 70 - 74
l Sample Question Paper - 5 75 - 80
 Self Assessment Papers*
l Self Assessment Paper - 1 81 - 86
l Self Assessment Paper - 2 87 - 93
l Self Assessment Paper - 3 94 - 99
l Self Assessment Paper - 4 100 - 105
l Self Assessment Paper - 5 106 - 111
 Solutions
l Sample Question Paper - 2 112 - 119
l Sample Question Paper - 3 120 - 127
l Sample Question Paper - 4 128 - 135
l Sample Question Paper - 5 136 - 142
l Hints 143 - 144

See Self Assessment Paper Solution at Last this PDF
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CBSE CIRCULAR 2022-23
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CENTRAL BOARD OF SECONDARY EDUCATION
CBSE/DIR(ACAD)/2022/ Dated: 20.05.2022
Circular No. ACAD-57/2022
All Heads of schools affiliated to CBSE
Subject : Assessment and Evaluation Practices of the Board for the Session 2022-23
National Education Policy 2020 has affirmed the need to move from rote to competency-based learning. This will
equip the learners with key competencies to meet the challenges of the 21st century proactively. Accordingly, the
Board has taken multiple steps towards the implementation of Competency Based Education (CBE) in schools.
These range from aligning assessment to CBE, development of exemplar resources for teachers and students on
CBE pedagogy and assessment and continued teacher capacity building.
In this context the Board has released Circular No. Acad-05/2019 dated 18.01.2019; Circular No. Acad-11/2019 dated
06.03.2019; Circular No. Acad-18/2020 dated 16.03.2020; Circular No. Acad-32/2020 dated 14.05.2020 and Circular
No. Acad-31/2020 dated 22.04.2021. In continuation to these circulars, the Board is initiating further corresponding
changes in the Examination and Assessment practices for the year 2022-23 to align assessment to Competency
Based Education. Therefore, in the forthcoming sessions a greater number of Competency Based Questions or
questions that assess application of concepts in real-life/ unfamiliar situations will be part of the question paper.
The changes for classes IX-XII (2022-23) internal year-end/Board Examination are as detailed:
(Classes IX-X)
Year End (2021-22) (2022-23)
Examina- Existing Modified
tion/ Board (As per Special Scheme of Assessment for (Annual Scheme)
Examination Board Examination – Circular No. Acad-
(Theory) 51/2021 dated 05.07.2021)
Composition • Term I – Multiple Choice Question includ- • Competency Based Questions would be
ing case based and assertion reasoning type minimum 40%
MCQs – 100% (30% questions competency These can be in the form of Multiple Choice
based) Questions, Case based Questions, Source based
• Term II – Case based/ Situation based, Integrated Questions or any other types.
Open Ended- short answer/long answer • Objective Type Questions will be 20%
questions (30% questions competency based) • Remaining 40% short
Composition • Term I – Multiple Choice Question includ- • Competency Based Questions would be
ing case based and assertion reasoning type minimum 40%
MCQs – 100% (30% questions competency These can be in the form of Multiple Choice
based) Questions, Case based Questions, Source based
• Term II – Case based/ Situation based, Integrated Questions or any other types.
Open Ended- short answer/long answer • Objective Type Questions will be 20%
questions (30% questions competency based) • Remaining 40% short answer/long answer
questions (as per existing pattern)
Internal Assessment : No change Internal Assessment: End of year examination = 20:80
Year End Examination/ Board Examination (Theory)
Curriculum document released by the Board vide circular No.Acad-50/2022 dated 28th April, 2022 and
the forthcoming Sample Question Papers may be referred for the details of changes in the QP design
of individual subjects.

(Dr. Joseph Emmanuel)
Director (Academics)
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SYLLABUS
Latest Syllabus issued by CBSE dated 21st April 2022 for
Academic Year 2022-23
CHEMISTRY (Code No. 043)
CLASS-XII (Theory)
Total Periods (Theory 160 + Practical 60)
Time : 3 Hours 70 Marks
S. No. Title No. of Periods Marks
1. Solutions 15 7
2. Electrochemistry 18 9
3. Chemical Kinetics 15 7
4. d- and f-Block Elements 18 7
5. Coordination Compounds 18 7
6. Haloalkanes and Haloarenes 15 6
7. Alcohols, Phenols and Ethers 14 6
8. Aldehydes, Ketones and Carboxylic Acids 15 8
9. Amines 14 6
10. Biomolecules 18 7
Total 160 70
Unit II : Solutions 15 Periods
Types of solutions, expression of concentration of solutions of solids in liquids, solubility of
gases in liquids, solid solutions, Raoult’s law, colligative properties - relative lowering of vapour
pressure, elevation of boiling point, depression of freezing point, osmotic pressure, determination
of molecular masses using colligative properties, abnormal molecular mass, Van’t Hoff factor.
Unit III : Electrochemistry 18 Periods
Redox reactions, EMF of a cell, standard electrode potential, Nernst equation and its application
to chemical cells, Relation between Gibbs energy change and EMF of a cell, conductance
in electrolytic solutions, specific and molar conductivity, variations of conductivity with
concentration, Kohlrausch’s Law, electrolysis and law of electrolysis (elementary idea), dry cell-
electrolytic cells and Galvanic cells, lead accumulator, fuel cells, corrosion.
Unit IV : Chemical Kinetics 15 Periods
Rate of a reaction (Average and instantaneous), factors affecting rate of reaction: concentration,
temperature, catalyst; order and molecularity of a reaction, rate law and specific rate constant,
integrated rate equations and half-life (only for zero and first order reactions), concept of collision
theory (elementary idea, no mathematical treatment), activation energy, Arrhenius equation.
Unit VIII : d and f Block Elements 18 Periods
General introduction, electronic configuration, occurrence and characteristics of transition metals,
general trends in properties of the first-row transition metals – metallic character, ionization
enthalpy, oxidation states, ionic radii, colour, catalytic property, magnetic properties, interstitial
compounds, alloy formation, preparation and properties of KCrO and KMnO.
2 2 7 4
Lanthanoids –
Electronic configuration, oxidation states, chemical reactivity and lanthanoid contraction and its
consequences.
Actinoids - Electronic configuration, oxidation states and comparison with lanthanoids.
Unit IX : Coordination Compounds 18 Periods
Coordination compounds - Introduction, ligands, coordination number, colour, magnetic
properties and shapes, IUPAC nomenclature of mononuclear coordination compounds. Bonding,
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SYLLABUS
Werner’s theory, VBT, and CFT ; structure and stereoisomerism, importance of coordination
compounds (in qualitative analysis, extraction of metals and biological system).
Unit X : Haloalkanes and Haloarenes 15 Periods
Haloalkanes : Nomenclature, nature of C–X bond, physical and chemical properties, optical
rotation mechanism of substitution reactions.
Haloarenes : Nature of C–X bond, substitution reactions (Directive influence of halogen in
monosubstituted compounds only).
Uses and environmental effects of - dichloromethane, trichloromethane, tetrachloromethane,
iodoform, freons, DDT .
Unit XI : Alcohols, Phenols and Ethers 14 Periods
Alcohols : Nomenclature, methods of preparation, physical and chemical properties (of
primary alcohols only), identification of primary, secondary and tertiary alcohols, mechanism of
dehydration, uses with special reference to methanol and ethanol.
Phenols : Nomenclature, methods of preparation, physical and chemical properties, acidic nature
of phenol, electrophillic substitution reactions, uses of phenols.
Ethers : Nomenclature, methods of preparation, physical and chemical properties, uses.
Unit XII : Aldehydes, Ketones and Carboxylic Acids 15 Periods
Aldehydes and Ketones : Nomenclature, nature of carbonyl group, methods of preparation,
physical and chemical properties, mechanism of nucleophilic addition, reactivity of alpha
hydrogen in aldehydes, uses.
Carboxylic Acids : Nomenclature, acidic nature, methods of preparation, physical and chemical
properties; uses.
Unit XIII : Amines 14 Periods
Amines : Nomenclature, classification, structure, methods of preparation, physical and chemical
properties, uses, identification of primary, secondary and tertiary amines.
Diazonium salts: Preparation, chemical reactions and importance in synthetic organic chemistry.
Unit XIV : Biomolecules 18 Periods
Carbohydrates - Classification (aldoses and ketoses), monosaccahrides (glucose and fructose),
D-L configuration oligosaccharides (sucrose, lactose, maltose), polysaccharides (starch, cellulose,
glycogen); Importance of carbohydrates.
Proteins - Elementary idea of - amino acids, peptide bond, polypeptides, proteins, structure of
proteins - primary, secondary, tertiary structure and quaternary structures (qualitative idea only),
denaturation of proteins; enzymes. Hormones - Elementary idea excluding structure.
Vitamins : Classification and functions.
Nucleic Acids : DNA and RNA.
Note : The content indicated in NCERT textbooks as excluded for the year 2022-23 is not to be tested by
schools.
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SYLLABUS
PRACTICALS
3 Hours/30 Marks
Evaluation Scheme for Examination Marks
Volumetric Analysis 08
Salt Analysis 08
Content Based Experiment 06
Project Work 04
Class record and Viva 04
Total 30
PRACTICALS SYLLABUS 60 Periods
Micro-chemical methods are available for several of the practical experiments. Wherever possible, such
techniques should be used.
A. Surface Chemistry
(a) Preparation of one lyophilic and one lyophobic sol
Lyophilic sol - starch, egg albumin and gum
Lyophobic sol - aluminium hydroxide, ferric hydroxide, arsenous sulphide.
(b) Dialysis of sol-prepared in (a) above.
(c) Study of the role of emulsifying agents in stabilizing the emulsion of different oils.
B. Chemical Kinetics
(a) Effect of concentration and temperature on the rate of reaction between Sodium Thiosulphate
and Hydrochloric acid.
(b) Study of reaction rates of any one of the following:
(i) Reaction of Iodide ion with Hydrogen Peroxide at room temperature using different
concentration of Iodide ions.
(ii) Reaction between Potassium Iodate, (KIO) and Sodium Sulphite: (NaSO) using starch
3 2 3
solution as indicator (clock reaction).
C. Thermochemistry
Any one of the following experiments
(a) Enthalpy of dissolution of Copper Sulphate or Potassium Nitrate.
(b) Enthalpy of neutralization of strong acid (HCI) and strong base (NaOH).
(c) Determination of enthaply change during interaction (Hydrogen bond formation) between
Acetone and Chloroform.
D. Electrochemistry :
Variation of cell potential in Zn/Zn2+|| Cu2+/Cu with change in concentration of electrolytes (CuSO
4
or ZnSO) at room temperature.
4
E. Chromatography :
(a) Separation of pigments from extracts of leaves and flowers by paper chromatography and
determination of R values.
f
(b) Separation of constituents present in an inorganic mixture containing two cations only (constituents
having large difference in R values to be provided).
f
F. Preparation of Inorganic Compounds :
Preparation of double salt of Ferrous Ammonium Sulphate or Potash Alum. Preparation of
Potassium Ferric Oxalate.
G. Preparation of Organic Compounds :
Preparation of any one of the following compounds
(i) Acetanilide
(ii) Di -benzal Acetone
(iii) p-Nitroacetanilide
(iv) Aniline yellow or 2 - Naphthol Aniline dye.
H. Tests for the functional groups present in organic compounds :
Unsaturation, alcoholic, phenolic, aldehydic, ketonic, carboxylic and amino (Primary) groups.
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SYLLABUS
I. Characteristic tests of carbohydrates, fats and proteins in pure samples and their detection in given
foodstuffs.
J. Determination of concentration/ molarity of KMnO solution by titrating it against a standard
4
solution of :
(a) Oxalic acid,
(b) Ferrous Ammonium Sulphate
(Students will be required to prepare standard solutions by weighing themselves).
K. Qualitative analysis
Determination of one cation and one anion in a given salt.
Cation :Pb2+, Cu2+ As3+, Al3+, Fe3+, Mn2+, Zn2+, Ni2+, Ca2+, Sr2+, Ba2+, Mg2+, NH+
4
Anions: (CO)2-, S2-, (SO)2-, (NO)-, (SO)2-, Cl-, Br -, I-, PO3-, (CO)2-, CHCOO-,NO-
3 3 2 4 2 4 3 3
(Note: Insoluble salts excluded)
INVESTIGATORY PROJECT
Scientific investigations involving laboratory testing and collecting information from other sources.
A few suggested Projects.
l Study of the presence of oxalate ions in guava fruit at different stages of ripening.
l Study of quantity of casein present in different samples of milk.
l Preparation of soyabean milk and its comparison with the natural milk with respect to curd
formation, effect of a temperature, etc.
l Study of the effect of Potassium Bisulphate as food preservative under various conditions
(temperature, concentration, time, etc.)
l Study of digestion of starch by salivary amylase and effect of pH and temperature on it.
l Comparative study of the rate of fermentation of following materials: wheat flour, gram flour,
potato juice, carrot juice, etc.
l Extraction of essential oils present in Saunf (aniseed), Ajwain (carum), Illaichi (cardamom).
4
l Study of common food adulterants in fat, oil, butter, sugar, turmeric power, chilli powder and
pepper.
Note : Any other investigatory project, which involves about 10 periods of work, can be chosen with
the approval of the teacher.
Practical Examination for Visually Impaired Students
of Classes XI and XII Evaluation Scheme
Time Allowed : Two hours Max. Marks : 30
Topic Marks
Identification/ Familiarity with the apparatus 5
Written test (based on given/ prescribed practicals) 10
Practical Record 5
Viva 10
Total 30
General Guidelines
• The practical examination will be of two hour duration.
• A separate list of ten experiments is included here.
• The written examination in practicals for these students will be conducted at the time of practical
examination of all other students.
• The written test will be of 30 minutes duration.
• The question paper given to the students should be legibly typed. It should contain a total of 15 practical
skill based very short answer type questions. A student would be required to answer any 10 questions.
• A writer may be allowed to such students as per CBSE examination rules.
• All questions included in the question papers should be related to the listed practicals. Every question
should require about two minutes to be answered.
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SYLLABUS
• These students are also required to maintain a practical file. A student is expected to record at least five
of the listed experiments as per the specific instructions for each subject. These practicals should be duly
checked and signed by the internal examiner.
• The format of writing any experiment in the practical file should include aim, apparatus required,
simple theory, procedure, related practical skills, precautions, etc.
• Questions may be generated jointly by the external/internal examiners and used for assessment.
• The viva questions may include questions based on basic theory/principle/concept, apparatus/materials/
chemicals required, procedure, precautions, sources of error, etc.
1. Items for Identification/Familiarity of the apparatus for assessment in practicals (All experiments)
Beaker, glass rod, tripod stand, wire gauze, Bunsen burner, Whatman filter paper, gas jar, capillary
tube, pestle and mortar, test tubes, tongs, test tube holder, test tube stand, burette, pipette, conical flask,
standard flask, clamp stand, funnel, filter paper
Hands-on Assessment
• Identification/familiarity with the apparatus
• Odour detection in qualitative analysis
2. List of Practicals
The experiments have been divided into two sections:
Section A and Section B.
The experiments mentioned in Section B are mandatory.
SECTION - A
A. Surface Chemistry
(1) Preparation of one lyophilic sol
Lyophilic sol - starch, egg albumin and gum
(2) Preparation of one lyophobic sol
Lyophobic sol – Ferric hydroxide
B. Chromatography
Separation of pigments from extracts of leaves and flowers by paper chromatography and
determination of R values (distance values may be provided).
f
C. Tests for the functional groups present in organic compounds:
(1) Alcoholic and Carboxylic groups.
(2) Aldehydic and Ketonic
D. Characteristic tests of carbohydrates and proteins in the given foodstuffs.
E. Preparation of Inorganic Compounds- Potash Alum
SECTION - B (Mandatory)
F. Quantitative analysis
(1) (a) Preparation of the standard solution of Oxalic acid of a given volume
(b) Determination of molarity of KMnO solution by titrating it against a standard solution of Oxalic
4
acid.
(2) The above exercise [F 1 (a) and (b)] to be conducted using Ferrous ammonium sulphate (Mohr’s
salt)
G. Qualitative analysis :
(1) Determination of one cation and one anion in a given salt.
Cations- NH+
Anions – (CO4 )2– , S2–, (SO)2–, Cl–, CHCOO– (Note: Insoluble salts excluded)
3 3 3
Note: The above practicals may be carried out in an experiential manner rather than recording observations.
Prescribed Books:
1. Chemistry Part -I, Class-XII, Published by NCERT.
2. Chemistry Part -II, Class-XII, Published by NCERT.
3. Laboratory Manual of Chemistry, Class XI Published by NCERT.
4. Other related books and manuals of NCERT including multimedia and online sources.
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