Minimum marks to paas chemistry theory exam of 12th class RBSE board? - 2014-2015 StudyChaCha

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  #1  
Old March 30th, 2012, 06:30 PM
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Default Minimum marks to paas chemistry theory exam of 12th class RBSE board?

Dear sir, i want to know that how many total marks i need to pass out in chemistry theory exam of 12th class RBSE board??
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  #2  
Old April 22nd, 2012, 07:45 PM
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Default Re: Minimum marks to paas chemistry theory exam of 12th class RBSE board?

Generally minimum 40% marks are required to pass out any exam paper in RSEB. There may be relaxation for reserved candidates.
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  #3  
Old February 21st, 2013, 10:40 AM
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Default Re: Minimum marks to paas chemistry theory exam of 12th class RBSE board?

sir, To pass out in chemistry theory exam of 12th class RBSE board you need 12/19 marks to pass out of 56
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  #4  
Old March 27th, 2014, 02:06 PM
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Default Re: Minimum marks to paas chemistry theory exam of 12th class RBSE board?

Applicants who has been appearing for annual examination held by the Board of secondary education rajasthan, the minimum Marks are decided by the Rajasthan Board, required to pass ,that is 33% marks out of the total marks. The students who was unable to get 33% of the total marks or in the individual marks, he/she will be declared as failed in that subject or cam also get the supplementary remarks.

Chemistry Syllabus:
Solid State
Solutions
Electrochemistry
Chemical Kinetics
Surface Chemistry
General Principles and Processes of Isolation of Element
p-Block Elements
d and f Block Elements
Coordination Compounds
Haloalkanes and Haloarenes
Alcohols, Phenols and Ethers
Aldehydes, Ketones and Carboxylic Acids

RBSE Class 12 Chemistry Syllabus

Rajasthan Board Chemistry Syllabus for Class 12
Time : 3.15 hours
Total Marks : 56
1. Solid State
Classification of solids based on different binding forces: molecular, ionic, covalent and metallic solids, amorphous and crystalline solids (elementary idea), Crystal Lattices
and unit cells, calculation of density of unit cell, packing in solids, voids, number of atoms per unit cell in a cubic unit cell, crystal ( point) defects, electrical and magnetic
properties.
Band theory of metals, conductors, semi-conductors and insulators and n&p type semi-conductors.

2. Solutions
Types of solutions, ideal and nonideal solution, deviation from ideal behavior and ezeotropic mixture, expression of concentration of solutions of solids in liquids, solubility of
gases in liquids, solid solutions, 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

3. Electrochemistry
Redox reactions, conductance in electrolytic solutions, specific and molar conductivity, variations of conductivity with concentration, Kohlrausch’s Law, electrolysis and laws
of electrolysis (elementary idea), dry cell – electrolytic cells and Galvanic cells, lead accumulator, EMF of a cell, standard electrode potential, Nernst equation and its
application to chemical cells, relation between Gibbj energy charge and emf of a cell, fuel cells, corrosion.

4. Chemical Kinetics
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), effect of temperature on rate of reaction, (Activation energy, Arrenious
equation) collision theory (elementary idea, no mathematical treatment)

5. Surface Chemistry
Adsorption – physisorption and chemisorption, factors affecting adsorption of gases on solids, catalysis : homogenous and heterogeneous, activity and selectivity, enzyme
catalysis; colloids distinction between true solutions, colloids and suspensions; lyophilic, lyophobic, multimolecular and macromolecular colloids; properties of colloids; Tyndall
effect, Brownian movement, electrophoresis, coagulation, emulsion – types of emulsions.

6. General Principles and Processes of Isolation of Element
Principles and methods of extraction - concentration, oxidation, reduction-electrolytic method and refining; occurrence and principles of extraction of aluminium, copper, zinc
and iron.

7. p-Block Elements
Group 15 Elements: General introduction, electronic configuration, occurrence, oxidation states, trends in physical and chemical properties; nitrogen - preparation, properties
and uses; compounds of nitrogen: preparation and properties of ammonia and nitric acid, oxides of nitrogen (structure only); Phosphorous-allotropic forms, compounds .of
phosphorous:

preparation and properties of phosphine, halides (PCl3, PCl5) and oxoacids (elementary idea only)

Group 16 Elements: General introduction, electronic configuration, oxidation states,
occurrence, trends in physical and chemical properties; dioxygen: preparation, properties
and uses, simple oxides, Ozone, Sulphur - allotropic forms;
compounds of sulphur:
preparation, properties and uses of sulphur dioxide, sulphuric acid: industrial process of
manufacture, properties and uses, oxoacids of sulphur (structures only).

Group 17 elements: General introduction, electronic configuration, oxidation states, occurrence, trends in physical and chemical properties; compounds of halogens,
preparation, properties and uses of chlorine and hydrochloric acid, interhalogen compounds, oxoacids of halogens (structures only).

Group 18 elements: General introduction, electronic configuration, occurrence, trends
in physical and chemical properties, uses.

8. d and f Block Elements
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
K2Cr2O7

and KMnO4.
Lanthanoids - electronic configuration, oxidation states, chemical reactivity and lanthanoid contraction and its consequences.
Actinoids - Electronic configuration, oxidation states and comparision with lanthanoid

9. Coordination Compounds
Coordination compounds - Introduction, ligands, coordination number, colour, magnetic properties and shapes, IUPAC nomenclature of mononuclear coordination
compounds. Bonding, isomerism, importance of coordination compounds (in qualitative analysis, extraction of metals and biological systems).

10. Haloalkanes and Haloarenes
Haloalkanes: Nomenclature, nature of C-X bond, physical and chemical properties, 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.

11. Alcohols, Phenols and Ethers
Alcohols: Nomenclature, methods of preparation, physical and chemical properties (of primary alcohols only), identification of primary, secondary and tertiary alcohols,
mechanism of dehydration, uses of 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.

12. Aldehydes, Ketones and Carboxylic Acids
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.

13. Organic compounds containing Nitrogen
Amines: Nomenclature, classification, structure, methods of preparation, physical and chemical properties, uses, identification of primary, secondary and tertiary amines.
Cyanides and Isocyanides -will be mentioned at relevant places in context.
Diazonium salts: Preparation, chemical reactions and importance in synthetic organic
chemistry.

14. Biomolecules
Carbohydrates - Classification (aldoses and ketoses), monosaccahrides (glucose and fructose), oligosaccharides (sucrose, lactose, maltose), polysaccharides (starch,
cellulose, glycogen), importance.
Proteins - Elementary idea of a - amino acids, peptide bond, polypeptides, proteins, structure of proteins-primary, secondary, tertiary structure and quaternary structures
(qualitative idea only), denaturation of proteins, enzymes. Harmons- elementry idea excluding structure.
Vitamins -Classification and functions.
Nucleic Acids: DNA and RNA.

15. Polymers
Classification - natural and synthetic, methods of polymerization (addition and condensation), copolymerization, some important polymers: natural and synthetic like
polythene, nylon, polyesters, bakelite, rubber. Biodegradable and non-biodegradable polymers.

16. Chemistry in Everyday life
Chemicals in medicines - analgesics, tranquilizers, antiseptics, disinfectants, antimicrobials, antifertility drugs, antibiotics, antacids, antihistamines.
Chemicals in food - preservatives, artificial sweetening agents. elementry idea of antioxidants
Cleansing agents - soaps and detergents, cleansing action.

PRACTICALS SYLLABUS
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) Study of the role of emulsifying agents in stabilizing the emulsions 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, (KIO3) and sodium sulphite: (Na2SO3) using starch solution as indicator (clock reaction).

C. Thermochemistry
Any one of the following experiments
(i) Enthalpy of dissolution of copper sulphate or potassium nitrate.
(ii) Enthalpy of neutralization of strong acid (HC1) and strong base (NaOH)
(iii) Determination of enthalpy 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 (CuSO4 or ZnSO4) at room temperature.

E. Chromatography
(i) Separation of pigments from extracts of leaves and flowers by paper chromatography and determination of Rfvalues.
(ii) Separation of constituents present in an inorganic mixture containing two cations only (constituents having large difference in Rfvalues to be provided).
F. Preparation of Inorganic Compounds

(i) Preparation of double salt of ferrous ammonium sulphate or potash alum.
(ii) Preparation of potassium ferric oxalate.

G. Preparation of Organic Compounds
Preparation of any two of the following compounds
(i) Acetanilide (ii) Di-benzal acetone
(iii) p-Nitroacetanilide. (iv) Aniline yellow or 2 - Naphthol aniline dye. (v) Iodoform
H. Tests for the functional groups present in organic compounds:
Unsaturation, alcoholic, phenolic, aldehydic, keton, carboxylic and amino (primary) groups.

I. Characteristic tests of carbohydrates, fats and proteins in pure samples and their detection in given food stuffs.
J. Determination of concentration/molarity of KMnO4 solution by titrating it against a standard solution of:
(i) Oxalic acid (ii) 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.
Cations - Pb2+,Cu2+,As3+,Al3+, Fe3+,Mn2+,Zn2+,Co2+, Ni2+,Ca2+, Sr2+,Ba2+,Mg2+,NH4
+
Anions - CO3 2-, S2-, SO3 2-, SO4 2-, NO2 –, NO3 –, Cl–, Br–, I–, PO4 3-, C2O4 2-, CH3COO–
(Note: Insoluble salts excluded)

Prescribed Books:
1. Chemistry Part - I - NCERT's Book Published under Copyright
2. Chemistry Part - II - NCERT's Book Published under Copyright
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  #5  
Old May 24th, 2014, 02:49 PM
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mere 12th me english me theory me 11 number aaye &16 nmber yha se beje total 27 marks aaye
my question is how many numer of passed in by gress
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  #6  
Old June 15th, 2014, 02:33 PM
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Default Re: Minimum marks to paas chemistry theory exam of 12th class RBSE board?

is it require to pass in theory and practical in physics and chemistry in class 12
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  #7  
Old August 22nd, 2014, 01:29 PM
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mere 12th chemistry me supplymentry aai hai mere 56 me se 3 marks aaye hai or 44 school me se aaye hai to mughe suppl. me minimum kitne marks lane hai
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