Page 1
2025
GOA BOARD
MODEL
PAPERS
Syllabus
Scheme of Question Paper
Prepare yourself for upcoming Goa
Board Exams
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CHEMISTRY XI
(2024-2025)
REVISED SYLLABUS
Unit: Some Basic Concepts of Chemistry (12 Periods)
General Introduction: Importance and scope of Chemistry.
Nature of matter, laws of chemical combination, Dalton's atomic theory: concept of elements, atoms and molecules.
Atomic and molecular masses, mole concept and molar mass, percentage composition, empirical and molecular
formula, chemical reactions, stoichiometry and calculations based on stoichiometry (including limiting reagent, mass
percentage, molarity, molality and mole fraction).
Unit: Structure of Atom (14 Periods)
Discovery of Electron, Proton and Neutron, atomic number, isotopes and isobars. Thomson's model and its limitations.
Rutherford's model and its limitations, Development leading to Bohr’s model, Bohr's model and its limitations, Quantum
mechanical model of the atom, concept of shells and subshells, dual nature of matter and light, de Broglie's relationship,
Heisenberg uncertainty principle, concept of orbitals, quantum numbers, shapes of s, p and d orbitals, rules for filling
electrons in orbitals - Aufbau principle, Pauli's exclusion principle and Hund's rule, electronic configuration of atoms
and ions, extra stability of half-filled and completely filled orbitals.
Unit: Classification of Elements and Periodicity in Properties (8 Periods)
Significance of classification, brief history of the development of periodic table, modern periodic law and the present form
of periodic table, periodic trends in properties of elements -atomic radii, ionic radii, inert gas radii, Ionization enthalpy,
electron gain enthalpy, electronegativity, valency, oxidation state, anomalous properties, diagonal relationship. Names
of elements from atomic number 100 to 118.
Unit: Chemical Bonding and Molecular Structure (14 Periods)
Valence electrons, ionic bond, covalent bond, bond parameters, Lewis’s structure, polar character of covalent bond,
covalent character of ionic bond, valence bond theory, resonance, geometry of covalent molecules, VSEPR theory,
concept of hybridization, involving s, p and d orbitals and shapes of some simple molecules, molecular orbital theory of
homonuclear diatomic molecules (qualitative idea only), Hydrogen bond.
Unit: Chemical Thermodynamics (16 Periods)
Concepts of System and types of systems, surroundings, work, heat, energy, extensive and intensive properties,
state functions.
First law of thermodynamics -internal energy and enthalpy, heat capacity and specific heat, measurement of ∆ U and
∆ H (change in internal energy and change in enthalpy), Hess's law of constant heat summation, thermochemical
equations, enthalpy of bond dissociation, combustion, formation, atomization, sublimation, phase transition,
ionization, solution and dilution. Second law of Thermodynamics (brief introduction), spontaneity, Introduction of
entropy as a state function, Gibb's energy change for spontaneous and non- spontaneous processes, Gibbs energy
change and equilibrium.
Unit: Equilibrium (14 Periods)
Equilibrium in physical and chemical processes, dynamic nature of equilibrium, law of chemical equilibrium and
equilibrium constant, law of mass action, homogeneous equilibria, equilibrium constant in gaseous systems,
heterogeneous equilibria, applications of equilibrium constants, relationship between equilibrium constant K, reaction
quotient Q and Gibbs energy G, factors affecting equilibrium - Le Chatelier's principle, ionic equilibrium, acids, bases and
salts, ionization of acids and bases, strong and weak electrolytes, degree of ionization, ionization of poly basic acids, acid
strength, concept of pH, hydrolysis of salts (elementary idea), buffer solution, solubility product, common ion effect (with
illustrative examples).
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Unit : Redox Reactions (06 Periods)
Concept of oxidation and reduction, redox reactions, oxidation number, balancing redox reactions, in terms of loss
and gain of electrons and change in oxidation number, applications of redox reactions- as the basis for titrations, electrode
processes. Types of redox reactions.
Unit : Organic Chemistry -Some Basic Principles and Techniques (14 Periods)
General introduction, methods of purification, qualitative and quantitative analysis, classification and IUPAC
nomenclature of organic compounds. Electronic displacements in a covalent bond: inductive effect, electrometric effect,
resonance and hyper conjugation. Homolytic and heterolytic fission of a covalent bond: free radicals, carbocations,
carbanions, electrophiles and nucleophiles, types of organic reactions.
Unit: Hydrocarbons (12 Periods)
Classification of Hydrocarbons
Aliphatic Hydrocarbons:
Alkanes - Nomenclature, isomerism, conformation (ethane only), Preparation, physical properties, chemical reactions
including free radical mechanism of halogenation, combustion and pyrolysis.
Alkenes - Nomenclature, structure of double bond (ethene), geometrical isomerism, physical properties, methods of
preparation, chemical reactions: mechanism of electrophilic addition-addition of hydrogen, halogen, water, hydrogen
halides (Markovnikov's addition and peroxide effect), ozonolysis, oxidation, Polymerization.
Alkynes- Nomenclature, structure of triple bond (ethyne), physical properties, methods of preparation, chemical
reactions: acidic character of alkynes, addition reaction of - hydrogen, halogens, hydrogen halides and water,
polymerization.
Aromatic Hydrocarbons:
Introduction, IUPAC nomenclature, benzene: resonance, aromaticity, preparation of benzene, physical properties,
chemical properties: mechanism of electrophilic substitution. Nitration, sulphonation, halogenation, Friedel Craft's
alkylation and acylation, directive influence of functional group in monosubstituted benzene. Carcinogenicity and
toxicity.
UNIT: P- BLOCK ELEMENTS (10 Pe riods)
Group -13 to Group 17 Elements
General Introduction: Electronic configuration and general trends in physical and chemical properties of elements down
the groups (oxidation states, atomic/ ionic radii, ionization enthalpy, electronegativity, electron gain enthalpy, reactivity
towards oxygen, hydrogen, halogen and metals), anomalous behavior of the first element in each group.
Group 18 elements: Electronic configuration, Physical properties and chemical properties (reasons for inertness to
chemical reactivity)
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GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATION
ALTO - PORVORIM - GOA.
CLASS: XI SUBJECT: CHEMISTRY
SCHEME OF EXAMINATION AND MARKS DISTRIBUTION (2024-25)
KNOWLEDGE 30% ±5%
UNDERSTANDING 40%±5%
WEIGHTAGE TO SKILL 10%+5%
OBJECTIVE APPLICATION 20%±5%
EXAMINATIONS MID FIRST SECOND INNOVATIVE
TERM TERM TERM TESTING&
PROJECT
SOME BASIC CONCEPTS OF
CHEMISTRY 6±1 9±1
STRUCTURE OF ATOM 8±1 10±1
CLASSIFICATION OF ELEMENTS
AND PERIODICITY IN PROPERTIES 6±1 8±1
CHEMICAL BONDING AND
MOLECULAR STRUCTURE 12±1
THERMODYNAMICS 9±1
EQUILIBRIUM 14±1
REDOX REACTIONS 10±1
ORGANIC CHEMISTRY-SOME BASIC 12±1
WEIGHTAGE TO PRINCIPLES & TECHNIQUES
CONTENT HYDROCARBONS 14±1
p-BLOCK ELEMENTS 10±1
CORE CONTENT
12±1
TOTAL 20 60 60 20
WEIGHTAGE TO TYPE OF NO OF
TYPES OF QUESTIONS MARK
QUESTIONS FOR MID QUESTIONS
S
TERM EXAMINATION
MULTIPLE CHOICE QUESTION (MCQ) --- 02 02
1MARK
VERY SHORT ANSWER (VSA)-- 1MARK 02 02
SHORT ANSWER I (SA I)--2MARKS 05 10
SHORT ANSWER I (SA II)-- 3MARKS 02* 06
*INTERNAL CHOICE FOR ANY ONE OF THE 03 MARKS QUESTION.
DIFFICULTY LEVEL EASY:-30% ±5% AVERAGE:-50% ±5% DIFFICULT :-20% ±5%
PRACTICALS
CONTENT FIRST TERM SECOND-TERM
VOLUMETRIC ANALYSIS 12 8
NATURAL ORGANIC COMPOUND 4 -------
INORGANIC COMPOUND ----- 10
JOURNAL + VIVA 2+2 2
MAXIMUM MARKS 20 20
DURATION IN MINUTES 120 150
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GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATIONALTO - PORVORIM, GOA.
MODEL BLUEPRINT OF MID TERM EXAM (2024-2025)
STD : XI SCIENCE SUBJECT : CHEMISTRY MARKS : 20 DURATION : 60min
OBJECTIVES DIFFICULTY LEVEL
K U S A Easy Average Difficult
(E) (Av) (D)
Percentage 20% 50% 10% 20% 30% 50% 20%
Marks 4 10 2 4 6 10 4
Variation of ± 5 % is permitted in the above Objectives and Difficulty Level
Type of questions Marks Number of Total marks
questions
MCQ 1 2 2
VSA 1 2 2
SA-I 2 5 10
SA -2 3 2 6
Total ….. 11 20
BLUEPRINT OF MID TERM EXAM (2024 - 2025)
Q. Type NAME OF THE UNIT Object Difficulty Duration Marks
ives (min)
No. level
1. MCQ 1 Somebasic U E 3 1
Concepts of chemistry
2. MCQ 2 Structure K Av 2 1
Of atom
3. VSA 1 Somebasic K E 2 1
concepts
4. VSA 3.Classification of U E 3 1
elements&periodicity in properties
5. SA-1 1.Some basic concepts of chemistry K Av 5 2
6. SA-1 1. Some basic concepts of chemistry A D 6 2
7. SA-1 2.Structure of atom S Av 6 2
8. SA-1 2. Structure of atom A D 6 2
9. SA-1 3.Classification of elements & U Av 6 2
periodicity in properties
10 SA-2 2.Structure of atom U E 8 3
*.
11. SA-2 3.Classification of elements & U Av 8 3
periodicity in properties
Total 55 20
*One internal choice
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GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATIONALTO - PORVORIM, GOA.
MODEL BLUEPRINT OF FIRST TERM EXAM (2024-2025)
STD : XI SCIENCE SUBJECT : CHEMISTRY MARKS : 60 DURATION : 150 min
OBJECTIVES DIFFICULTY LEVEL
K U S A Easy Average Difficult
(E) (Av) (D)
Percentage 30% 40% 10% 20% 30% 50% 20%
Marks 18 24 6 12 18 30 12
Variation of ± 5 % is permitted in the above Objectives and Difficulty Level
Type of questions Marks Number of questions Total marks
MCQ 1 8 8
VSA 1 4 4
SA – I 2 12 24
SA – II 3 4 12
LA 4 3 12
Total ….. 31 60
Choice to be provided for one question of two marks, one question of three marks and one question of 4 marks.
*(internal choice)
MCQ= Multiple Choice question
VSA = Very Short Answer
SA I =Short Answer type I
SA II = Short Answertype II
LA = Long Answer
BLUEPRINT OF FIRST TERM EXAM (2024-2025)
Q. No. Type Unit name Objecti Difficulty Duration Marks
ves level (min)
1. MCQ THERMODYNAMICS U A 1 1
2. MCQ ORGANIC CHEMISTRY-SOME A D 2 1
BASIC PRINCIPLES & TECHNIQUES
3. MCQ CLASSIFICATION OF ELEMENTS U A 2 1
AND PERIODICITY OF PROPERTIES
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4. MCQ CHEMICAL BONDING AND U A 2 1
MOLECULAR STRUCTURE
5. MCQ STRUCTURE OF ATOM A D 3 1
6. MCQ SOME BASIC CONCEPTS OF U A 1 1
CHEMISTRY
7. MCQ THERMODYNAMICS K E 1 1
8. MCQ SOME BASIC CONCEPTS OF A D 3 1
CHEMISTRY
9. VSA ORGANIC CHEMISTRY-SOME A D 3 1
BASIC PRINCIPLES & TECHNIQUES
10. VSA CHEMICAL BONDING AND K E 1 1
MOLECULAR STRUCTURE
11. VSA STRUCTURE OF ATOM U A 2 1
12. VSA CLASSIFICATION OF ELEMENTS K E 2 1
AND PERIODICITY OF PROPERTIES
13. SA-I CHEMICAL BONDING AND U A 5 2
MOLECULAR STRUCTURE
14. SA-I CLASSIFICATION OF ELEMENTS K E 4 2
AND PERIODICITY OF PROPERTIES
*15. SA-I THERMODYNAMICS U A 5 2
OR
*15. SA-I THERMODYNAMICS U A 5 2
16. SA-I STRUCTURE OF ATOM K E 5 2
17. SA-I SOME BASIC CONCEPTS OF A D 6 2
CHEMISTRY
18. SA-I CHEMICAL BONDING AND S A 6 2
MOLECULAR STRUCTURE
19. SA-I CLASSIFICATION OF ELEMENTS U A 6 2
AND PERIODICITY OF PROPERTIES
20. SA-I SOME BASIC CONCEPTS OF K E 5 2
CHEMISTRY
21. SA-I THERMODYNAMICS K E 4 2
22. SA-I STRUCTURE OF ATOM S A 6 2
23. SA-I CLASSIFICATION OF ELEMENTS K E 5 2
AND PERIODICITY OF PROPERTIES
24. SA-I CHEMICAL BONDING AND K E 6 2
MOLECULAR STRUCTURE
*25. SA-II ORGANIC CHEMISTRY- A D 8 3
SOME BASIC PRINCIPLES & TECHNIQUES
OR
*25. SA-II ORGANIC CHEMISTRY- A D 8 3
SOME BASIC PRINCIPLES & TECHNIQUES
26. SA-II THERMODYNAMICS K E 5 3
27. SA-II SOME BASIC CONCEPTS OF A D 7 3
CHEMISTRY
28. SA-II ORGANIC CHEMISTRY- U A 7 3
SOME BASIC PRINCIPLES & TECHNIQUES
*29. LA CHEMICAL BONDING AND U A 10 4
MOLECULAR STRUCTURE
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OR
*29. LA CHEMICAL BONDING AND U A 10 4
MOLECULAR STRUCTURE
30. LA ORGANIC CHEMISTRY- S+U A 9 2+2=4
SOME BASIC PRINCIPLES & TECHNIQUES
31. LA STRUCTURE OF ATOM U A 8 4
TOTAL DURATION IN MINUTES AND MARKS 140 min 60mks
GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATION , ALTO-PORVORIM GOA.
SECOND TERM EXAMINATION – XI SCIENCE ( 2024-2025)
MODEL BLUEPRINT OF SECOND TERM EXAM
MARKS : 60 MAXIMUM NUMBER OF QUESTION : 31 DURATION :150 min
OBJECTIVES DIFFICULTY LEVEL
K U S A Easy (E) Average(Av) Difficult(D)
Percentage 30% 40% 10% 20% 30% 50% 20%
Marks 18 24 6 12 18 30 12
Variation of ± 5% is permitted in the above Objectives and Difficulty Level
Type of question Marks Number of Questions Total marks
MCQ 1 8 8
VSA 1 4 4
SA-I 2 12 24
SA-II 3 4 12
LA 4 3 12
Total ….. 31 60
MCQ = Multiple Choice Question. VSA = Very Short Answer
Type.
SA – I = Short Answer Type I.
SA – II = Short Answer Type II.
LA = Long Answer Type.
*Internal choice
Internal choice to be provided for one question of two marks, one question of three marks and one question of four marks.
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GOA BOARD OF SECONDARY AND HIGHER SECONDARY EDUCATION , ALTO - PORVORIM GOA.
BLUEPRINT OF MODEL QUESTION PAPER FOR SECOND TERM EXAM (2024-2025)
STD : XI Science SUBJECT : Chemistry DURATION : 150 min MARKS : 60
Q. DIFFICULTY DURATION
No. TYPE UNIT OBJECTIVE LEVEL IN MINUTES MARKS
1 MCQ Redox Reactions K E 2 1
2 MCQ Equilibrium K E 2 1
3 MCQ Equilibrium U Av 3 1
4 MCQ Hydrocarbons K E 2 1
5 MCQ Hydrocarbons A D 4 1
6 MCQ p-block elements K E 2 1
7 MCQ p-block elements U D 3 1
8 MCQ Core content K E 1 1
9 VSA Redox Reactions A D 4 1
10 VSA Hydrocarbons U Av 3 1
11 VSA p-block elements K E 2 1
12 VSA Core content K E 2 1
13 SA-I Equilibrium A D 4 2
14 SA-I Redox Reactions S Av 3 2
15* SA-I Redox Reactions K E 4 2
OR
15* SA-I Redox Reactions K E 4 2
16 SA-I Hydrocarbons K E 4 2
17 SA-I Hydrocarbons S Av 3 2
18 SA-I p-block elements A D 5 2
19 SA-I p-block elements U Av 4 2
20 SA-I Core content S Av 3 2
21 SA-I Core content A D 5 2
22 SA-I Core content K E 4 2
23 SA-I Core content K E 4 2
24 SA-I Core content U Av 4 2
25 SA-II p-block elements U Av 7 3
26* SA-II Hydrocarbons A D 8 3
OR
26* SA-II Hydrocarbons A D 8 3
27 SA-II Equilibrium K E 5 3
28 SA-II Equilibrium U Av 7 3
29 LA Redox Reactions U+A Av 12 4
30 LA Hydrocarbons U Av 12 4
31* LA Equilibrium U Av 12 4
OR
31* LA Equilibrium U Av 12 4
TOTAL DURATION IN MINUTES AND TOTAL MARKS 140 min 60 mks
Page 10
SEAT NO:- TABLE NO:-
Goa Board of Secondary & Higher Secondary Education
Alto, Betim – Goa
CHEMISTRY -XI SCIENCE
First Term Practical Examination(2024-25)
MODEL QUESTION PAPER
Date: Duration: 120 Minutes
Session: Max. Marks:20
Instructions:
1) Write your Examination Seat number and laboratory table number on your answer book and
question paper.
2) Get the burette reading and confirmatory tests initialed by the examiner.
3) Check if the number on (i) your table (ii) answer script and (iii) the containers A, B, and D are
the same. If not, report immediately to the examiner.
4) Use of non - programmable calculator is allowed.
Atomic Masses:- H=1, C=12, N=14, O=16, Na =23, S=32, K=39.
-------------------------------------------------------------------------------------------------------------
Q.1. You are provided with two solutions as follows:-
Container A: N/M solution of _______.
Container B: ______x N/M_______solution of _______.
Using the above solutions, determine:
i) N/M of the solution in container B.
ii) Calculate the Strength of the solution in container B, in terms of g/____ml (12 Marks)
Q.2. Identify the given Natural Organic substance in container D bearing your table number for the
presence of Carbohydrate/Fat or Oil/Protein and report the test that is positive. (04 Marks)
Q.3. Journal + Viva (2+2 Mark) (04 Marks)
****************************************************************
Marking Scheme for First Term Practical Examination-2024-25
Q 1) Volumetric Analysis ( Acid-base titration):………………………………… (12 Marks)
i) Observations : (Burette, pipette/ conical flask, indicator, color change) (2 Marks)
ii) Reading (6 Marks)
± 0.2………………………6mks
± 0.3……………………….5 mks
± 0.4………………………. 4mks
± 0.5……………………….3 mks
± 0.6……………………….2 mks
± 0.7……………………….1 mk
iii) Calculations: (4 Marks)
1. Determination of N/M of Solution B/A .................................................. 2 mk
2. Strength of the solution in container B/A, in terms of g/____ml … .......... 2 mk
Q2. Identification and correct reporting of the given Natural Organic substance………(04 Marks)
Q3. Journal + Viva………………………………………………………………2+2= (4 Marks)
Page 11
SEAT NO:- TABLE NO:-
Goa Board of Secondary & Higher Secondary Education
Alto, Betim – Goa
CHEMISTRY -XI SCIENCE
Second Term Practical Examination(2024-25)
MODEL QUESTION PAPER
Date: Duration: 150 Minutes
Session: Max. Marks:20
Instructions:
1) Write your Examination Seat number and laboratory table number on your answer book and
question paper.
2) Get the burette reading and confirmatory tests initialed by the examiner.
3) Check if the number on (i) your table (ii) answer script and (iii) the containers A, B, and D are
the same. If not, report immediately to the examiner.
4) Use of non - programmable calculator is allowed.
Atomic Masses:- H=1, C=12, N=14, O=16, Na =23, S=32, K=39.
-------------------------------------------------------------------------------------------------------------
Q.1. You are provided with two solutions as follows:-
Container A: g/ mL solution of .
Container B: Impure solution of
Using the above solutions, determine:
i) N/M of the solution in container B.
ii) Calculate the percentage purity of the solution in container B, g of which have
been dissolved per mL. (08 Marks)
Q.2. Analyse the inorganic salt given in container D bearing your table number
qualitatively and detect the cation and anion present. Give a complete
report of all the tests performed. Write the formula of the Compound
detected. (10 Marks)
Q.3. Journal (2 Marks)
************************************************************************
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CHEMISTRY -XI SCIENCE
Marking Scheme for Second Term Practical Examination
Q 1) Volumetric Analysis (Acid-base titration): (08 Marks)
i) Observations : (Burette, pipette/ conical flask, indicator, color change) (1Mark)
ii) Equation ………………………………………………………………………(1Mark)
iii) Reading (3 Marks)
± 0.2…….3mks
± 0.3….…2 ½ mks
± 0.4……2mks
± 0.5…….1 ½ mks
± 0.6…….1mk
iv) Calculations: (3 Marks)
Conversion of g/ V mL to M/N of Solution A ............................................ 1 mk
Determination of N/M of Solution B ......................................................... 1 mk
Percentage purity of Solution B… ............................................................... 1 mk
Q2.Inorganic Qualitative analysis (10 Marks)
1) Preliminary test /Dry test………………………………………… ½ x 8 = 4 mks
2) Wet test for anion: Correct anion…............................................................... (1 mk)
C.T .......................................................................................... (1mk)
3) Wet test for cation: Correct group… .............................................................. (1mk)
Correct cation ......................................................................... ( 1 mk)
C.T .......................................................................................... ( 1 mk)
4) Correct formula…………………………………………………………………..(1 mk)
Q3. Journal (2 Marks)
Page 13
GUIDELINES FOR CONDUCT OF THE XI-PRACTICALS IN CHEMISTRY -2024-25
1 .Student should report:
(a) Minimum of 4 volumetric exercises.(Acid base titrations)
(b) Minimum of 10 inorganic qualitative analysis.(Same list of salts as given for STD-XII)
(c) Four physical experiments(to be evaluated for viva only)
i. Crystallization of Copper sulphate
ii. Determination of Boiling & Melting point of two separate organic compounds.
iii. Study the shift in equilibrium between ferric ions and thiocynate ions by
increasing /decreasing the concentration of either of the ions/ Study the shift in
equilibrium between [Co(H2O)6 ]2+ and chloride ions by changing the
concentration of either of the ions.
iv. Determination of pH of some solutions obtained from fruit juices, solutions of
known and varied concentrations of acids, bases and salts using pH paper
and/or universal indicator
(d) Identification of Natural organic substances
Note:
I. Except for fat/oil aqueous solution or suspension of food items containing
natural organic substance to be given and not the direct natural organic
substance.
II. Any one of the positive test to be reported
2. Innovative test = 10 Marks
3. Project *=10 Marks
Project* (Periods 10)
Scientific investigations involving laboratory testing and collecting information from other sources.
A few suggested projects
• Checking the bacterial contamination in drinking water by testing sulphide ions.
• Study of the methods of purification of water.
• Testing the hardness, presence of iron, fluoride, chloride etc. depending upon the regional
variation in drinking water and the study of causes of presences of these ions above
permissible limit (if any)
• Investigation of the foaming capacity of different washing soaps and the effect of
addition of sodium carbonate on them.
• Study of the acidity of different samples of the tea leaves.
• Determination of the rate of evaporation of different liquids.
• Study of the effect of acids and bases on the tensile strength of fibers.
• Analysis of fruit and vegetable juices for their acidity.
Note: Any other investigatory project, which involves about 10 periods of work, can be
chosen with the approval of the teacher.
** Project work may be performed individually or in a group of maximum 4
students
*******************************************************************
Page 14
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