Important questions of NEB-12 Chemistry with marking pattern
For MCQ, the question can be law-related, figurative analysis, reason oriented
For 5 marks, the question can be (2+3)
- mark questions can be definition, law statement, application, short give a reason.
- mark questions can be short derivations or analytical give reasons.
- mark questions can be a numerical or long derivation or figure-related short questions
For 8 marks, the possibilities can be3+5=8,1+2+2+3=8
- mark questions can be definition, law statement, short give-a-reason, figure related short questions.
- mark questions can be give-reason type questions or short derivations.
- marks can be numerical problems or long derivations.
A. FROM ORGANIC CHEMISTRY: PATTERN -1 (NAME REACTIONS)
( ORGANIC CHEMISTRY)
NAME REACTIONS
1 SANDMAYERS REACTION
2. CATTERMAN REACTION
3. FITTIC REACTION
4. WURTZ REACTION
5.WURTZ-FITIG REACTION
6. DDT.BHC. BAKELITE. PHENOLPHTHALEIN FORMING REACTION
7. FRIEDEL CRAFT ALKYLATION AND ACYLATION
8.REIMER TIEMANN REACTION
9. CARBYLAMINE REACTION
10 DECARBOXYLATION
11. DEHYDROHALOCENATION
12. DEHYDROGENATION
13. MARKONIKOV'S RULE
14 ANTI-MARKONIKOV'S RULE
IS HELL VOLHARD ZELINSKY REACTION
16 HOFFMANN'S BROMAMIDE REACTION
17 MENDIUS REACTION
18. CLEMMENSON REDUCTION
A. FROM ORGANIC CHEMISTRY: PATTERN -1 (NAME REACTIONS)
PATTERN -2 ( ORGANIC CONVERSION)
NAME REACTIONS
I.WOLF-KISHNER REDUCTION
2.CANNlZAROS REACTION
3 .ALDOL CONDENSATION
4. PERKIN CONDENSATION
5. ROSENMUND REDUCTION
6. TOLLEN'S TEST
7. FEHLINC TEST
8 .DIAZOTIZATION REEACTION
9.COUPLlNC REACTION
10. OZONOLYSIS
11.2,4 DNP TEST
12 IODOFORM TEST
13. NITROUS ACID TEST FOR AMINES
14.ESTERlFlCATlON
15. WILLIAMSON'S SYNTHESIS OF ETHER
16 KOLBE'S REACTION
17 BENZOIN CONDENSATION
18.CLAlSEN CONDENSATION
B. FROM PHYSICAL CHEMISTRY
IONIC EQUILIBRIUM
Conjugate acid• base pairs
Lewis's definition of acids and bases
Ionization Of weak electrolyte (Ostwald's dilution jaw)
DEFINE Ionic product ofwater(Kw)
ESTABLISH Dissociation constant of acid and base, IKa& KB)
DEFINE pH value; pH Of strong and weak acids. pH Of strong and weak bases
DEFINE Solubility and solubility product principle
EXPLAINApplication of solubility product principle and common ion effect in precipitation reactions
DEFINE Buffer solution and its application
DEFINE Indicators and selection of indicators in acid•base titration
*LIST Types of salts: Acidic salts, basic salts. simple salts.
*SOLVE THE NUMERICAL ABOUT PH AND SOLUBILITY PRODUCT
CHEMICAL KINETICS
DEFINE Rate of reactions: Average and instantaneousrateofreactions
DEFINE Rate law and its expressions
DEFINERate Constant and its unit and significance
DIFFERENTIATE Order and molecularity
DERIVE Integrated rate equation for zero and first-order reaction
EXPLAIN Collision theory, the concept of activation energy. and activated complex
EXPLAIN Catalysis and types Of catalysis: homogeneous.
SOLVE TABLE-RELATED NUMERALS AND TIME. PERIOD NUMERICAL
IMPORTANT QUESTIONS OF NEB -12 CHEMISTRY WITH PATTERN ANALYSIS
FOR 8 MARKS
C. CEMENT. PAPER, DRUGS, AND DYES 
polymers: Addition and condensation polymers
- DIFFERENTIATE: Elastomers and fibers
- DIFFERENTIATE: Natural and synthetic polymers
- Some synthetic polymers (polyethylene. PVC, Teflon, polystyrene. nylon. and bakelite
Dyes: Types of dyes based on structure and method of application - Drugs: Characteristics of drugs
LIST Natural and synthetic drugs- Classification of some common drugs: ANTIPYRETIC. ANALESCIC, SULPHA DRUGS
- CIVE AN EXAMPLE OF insecticides, herbicides, and fungicides
- Cement: Raw materials for cement production
- steps crushing and grinding, strong heating. and final grinding.
- DIFFERENTIATE: OPC and PPC
- DESCRIBE: Portland cement process with flow-sheet diagram
- Paper and pulp: Raw materials: Sources of raw materials: Stages in the production of paper: Flowsheet diagram for paper production
- DEFINE the Quality Of paper
IMPORTANT QUESTIONS OF NEB -12 CHEMISTRY WITH PATTERN ANALYSIS
- FOR 5 MARKS
- I.VOLUMETRIC ANALYSIS
- ESTABLISH Relationship between equivalent weight, atomic weight, and valency
- CALCULATE Equivalent weight Of compounds (acid. base. salt. oxidizing and reducing agents) DEFINE Concentration Of solution and its units in terms Of percentage. g/L. molarity.
normality and formality. ppm and ppb - DIFFERENTIATE primary and secondary standard substances. REQUISITE FOR PRIMARY SUBSTANCES STATE Law of equivalence and normality equation
- DEFINE Titration and its Types: Acid-base titration. redox titration ( related numerical problems)
CHEMICAL THERMODYNAMICS
- DEFINE Internal energy
- STATE First law of thermodynamics
- DEFINE Enthalpy and enthalpy changes: Endothermic and exothermic processes)
- DEFINE Enthalpy of reaction. enthalpy of solution, enthalpy of formation, enthalpy Of combustion
- STATE Laws of thermochemistry (Laplace Law and Hess's law)
- DEFINE Entropy and spontaneity
- STATE Second law of thermodynamics
- DEFINE Gibbs' free energy and prediction Of Spontaneity
- STATE Relationship between AG and equilibrium constant (Solving related numerical problems)
3. ELECTROCHEMISTRY
- DEFINE Electrode potential and standard electrode potential
- STATE Types of electrodes: Standard hydrogen electrodes and calomel electrodes
- DEFINE Electrochemical series and its applications
- DESCRIBE Voltaic cell: Zn-Cu cell. Ag- Cu cell
- DEFINE Cell potential and standard cell potential
- Establish the Relationship between cell potential and free energy
IMPORTANT QUESTIONS OF NEB -12 CHEMISTRY WITH PATTERN ANALYSIS
- FOR 5 MARKS
- 4. TRANSITIONAL METALS
- LIST Characteristics Of transition metals
- LIST Oxidation states of transition metals
- DEFINE Complex ions and metal complexes OF THE
- DEFINE Shapes of complex ions
- EXPLAIN d-orbitals in complex ions (simple explanation by crystal field theory) for octahedral complex
- WRITE Reasons for the color of transition metal compounds
LIST Catalytic properties of transition metals
5. HEAVY METALS
- EXPLAIN THE COMPARATIVE EXTRACTION OF COPPER, ZINC. MERCURY AND IRON.
- WRITE THE CHEMISTRY OF BLUE VITRIOL. WHITE VITRIOL. CALOMEL. CORROSIVE SUBLIMATE.
- EXPLAIN Manufacture of steel by Basic Oxygen Method and Open Hearth Process EXPLAIN Corrosion of iron and its prevention
6.0RGANlCTEST
- VICTOR MAYER'S TEST OF r, & 3• ALCOHOL AND SPECIFIED ALCOHOLS ( PROPAN-2-OL,DIMETHYL PROPAN-2-OL )
- HOFFMANN'S SEPARATION OF AMINES
- ALIPHATIC ORGANIC CONVERSION INCLUDING CHAPTERS LIKE HALOALKANES, ALCOHOLS, AND ETHERS. ALDEHYDE AND KETONES. CARBOXYLIC ACIDS. AMINES.
- AROMATIC ORGANIC CONVERSION INCLUDING CHAPTERS LIKE HALOARENES. PHENOLS. NITROBENZENE. ANILINE. BENZALDEHYDE. BENZOIC ACIDS AND BENZENES.
source:@AOMES