Class 12 Chemistry Important Questions & Topics NEB 2080

In this post, we will cover the most important chemistry questions and topics for the NEB (Board Exam) as well as internal exams.

Contents

PHYSICAL CHEMISTRY Unit:1. Volumetric Analysis Unit:2. Ionic Equilibrium Unit:3. Chemical Kinetics Unit:4. Thermodynamics Unit:5. Electrochemistry Some Important Questions of Physical Chemistry for Class 12 Chemistry INORGANIC CHEMISTRY SET 1: Characteristics of Transition metals:SET 2: Extraction of :SET 3: Chemistry of:ORGANIC CHEMISTRY SET 1: Lab preparation ( Reaction only) of : SET 2: Almost one sure :SET 3: Name reactions:SET 4: Test reaction:SET 5: Important reactions:SET 6: Reactions to prepare: (with one use)SET 7 : Convert:APPLIED CHEMISTRY Write monomers and one use of:Write an example and one use of:

We provide the most important Physical Chemistry questions for NEB Exam by chapters.

Important Question and topic for Chemistry in NEB Exam

Important Question and Topics Class 12 Chemistry 2080 NEB Board Exam

PHYSICAL CHEMISTRY

Unit:1. Volumetric Analysis

What are primary and secondary standard solutions?
What are the requisites for a substance to be a primary standard?
Define molarity and normality. Write their relationship.
What is meant by redox titration?
How is a suitable indicator selected for a particular titration?

Define the terms:

Normality
Molarity
Normality factor
Endpoint and Equivalent point
Titration error
Semi-normal solution and Decinormal solution
Indicator
Alkalimetry
Acidimetry
Basicity of acid
Acidity of base
Gram equivalent weight

Unit:2. Ionic Equilibrium

State Ostwald’s dilution law. What is the limitation of this law?
Define pH and pOH. Write their relation.
What will happen when HCl gas is passed over a saturated solution of NaCl, also Explain the principle involved?
Acid and Base
Bronsted Acid and Bronsted Base.
Conjugate acid and conjugate Base pair of NH3?
Define Lewis Acid and Base with Examples?
Write Limitation of Lewis Acid and Lewis Base?
Define the Common ion effect?
Application of Common ion effect?
Solubility product principle and its application.
What is the ionic product of water?

Define:

Acidic salt
Degree of ionization

Unit:3. Chemical Kinetics

Define chemical kinetics.
Define the rate of Chemical reaction.
Define the half-life of a reaction.
Factors affecting the rate of reaction.
Write rate law.
What is the rate constant? Write its unit?
What do you mean by the order of a reaction?
Define the first ( 1st) order reaction with its unit?
What is meant by Instantaneous rate of reaction?
Differentiate between the order and molecularity of a reaction?
How do concentration, temperature, Catalyst, and surface area of reactants affect the rate of reaction?
What is meant by the effective collision of reacting species? What are the essential conditions for the effective collision of reacting species?
Find the unit of rate constant of zero, first, and second order reaction.
Arrhenius equation
Catalyst and catalysis
Homogenous catalysis
Heterogeneous Catalysis
Enzyme
Explain the role of catalyst in the reaction mechanism

Explain these terms:

Rate of reaction
Rate equation
Rate constant
Activation energy
Effective collision
Proper orientation

Unit:4. Thermodynamics

Define thermodynamics
What is the physical concept of entropy?
First law of thermodynamics
Second law of thermodynamics
Third law of thermodynamics
State and Explain Hess’s law of constant heat summation.
Predict the criteria of spontaneity in light of entropy change.

Explain the terms:

Entropy
Enthalpy
Gibb’s free energy
Spontaneous process
Non-spontaneous process
Exothermic process
Endo thermic process
Isothermal Process
Adiabatic Process
Isobaric Process
Isochoric Process
Cyclic process

Unit:5. Electrochemistry

What is Electro Chemistry?
What are Electrodes?
Standard electrode( redox ) potential
Hydrogen electrodes
Calomel Electrodes
Electrochemical series
Application of Electrochemical series
Standard Hydrogen Electrode
Cell potential and free energy change
What is a cell? Explain its types.
Commercial cell

Some Important Questions of Physical Chemistry for Class 12 Chemistry

Selection of indicators.
Different concepts of acids and bases and their limitations
Common ion effect and solubility product principle and its application salt analysis (precipitation reaction).
Buffer solution.
Faraday’s laws of electrolysis.
Standard electrodes.
Hess law.
Prediction of feasibility/ spontaneity of reactions in terms of free energy change, entropy change, and enthalpy change.
Differences between order and molecularity of a reaction.
Collision theory of reaction rate.
Factors affecting rate of reaction.
Derivation of integrated rate equation and half-life for a first-order reaction.

INORGANIC CHEMISTRY

SET 1: Characteristics of Transition metals:

Variable oxidation state
Formation of complexes
Reason for colored complexes
Catalytic property
Magnetic property.
CFT for the octahedral complex.

SET 2: Extraction of :

(Blister) copper from copper pyrites.
Steel (Mainly Open Hearth process)
Iron from iron pyrites.
Zinc from zinc blend ( sulphide ore).
Mercury from cinnabar (HgS) ore.

SET 3: Chemistry of:

Blue vitriol ( CuSO4.5H2O)
White vitriol ( ZnSO4. 7H2O)
Zinc white ( ZnO)
Calomel (Hg2Cl2)
Corrosive sublimate (HgCl2)

ORGANIC CHEMISTRY

SET 1: Lab preparation ( Reaction only) of :

Chloroform (trichloro methane )
Nitrobenzene
Formic acid (methanoic acid)
Aniline
Diethyl ether (Ethoxy ethane)

SET 2: Almost one sure :

Identification of 1, 2, and 3 alcohols by Victor Meyer’s method.
Separation of 1, 2, and 3 amines by Hoffmann’s method.

SET 3: Name reactions:

Aldol condensation reaction
Cannizaro’s reaction
Perkins condensation
Claisen Condensation reaction.
Benzoin condensation
Carbylamine reaction
Reimer Tiemann reaction
Coupling reaction( preparation of azo dyes)
Diazotization reaction
Friedel- Craft’s reaction
Hoffmann’s Bromamide reaction( De carbonylation reaction)
Esterification reaction
Carbonylation reaction (Oxo process)
Williamson’s etherification reaction
Rosenmund reduction

SET 4: Test reaction:

Iodoform test
Silver mirror test( reaction with Tollen’s reagent)
Nitrous acid test of 10, 20, and 30 amines.
2,4 – DNP test
Carbylamine test ( test of primary amines)

SET 5: Important reactions:

Reduction of nitrobenzene in a different medium.
Preparation of alcohols using a Grignard reagent.
Oxidation of alcohols.
Fermentation
All reactions of chloroform.

SET 6: Reactions to prepare: (with one use)

DDT
Picric acid
BHC
Urotropin
Chloropicrin
TNT

SET 7 : Convert:

1-bromopropane to 2- bromopropane and vice-versa.
1- propanol to 2- propanol and vice versa.
Methenamine to ethanamine and vice versa.
Phenol to anisole(methoxy benzene) and vice versa.
Ethoxy ethane to methoxy ethane.
Phenol/aniline to azo-dye.
Ethanal/ ethanol to 3-hydroxy butanal.
Ethanol to 2- hydroxy propanoic acid.
Propanone(acetone) to 2-hydroxy-2-methyl propanoic acid.
Phenol to toluene.
Ethanol to propanol/ propanoic acid.
Methanamide to ethanamine.

Some Important questions of Organic Chemistry:

Why is chloroform stored in a dark bottle containing ethanol?
Why does chloroform not give white ppt. with aq. AgNO3?
Why is nucleophilic substitution reaction difficult in haloarene?
Why is the boiling point of ethanol greater than that of ethoxy ethane?
Why is phenol more acidic than aliphatic alcohol?
Why does nitrobenzene undergo an electrophilic substitution reaction at the meta position? ( Explain why –the NO2 group is meta-directing towards electrophilic aromatic substitution)
Why is chlorobenzene o/p – directed towards an electrophilic substitution reaction?
It is dangerous to boil a sample of ether stored for a long time, give a reason.
Ether is stored in a bottle containing iron wire, why?
Give a suitable test to distinguish ethanamine from N-methyl methenamine.
Write a chemical test to distinguish ethanoic acid(acetic acid) from methanoic acid(formic acid).
Why is a chloroacetic acid stronger acid than acetic acid?
Why is a formic acid stronger acid than acetic acid?
Why an amino group of aniline is protected before nitration? (Aniline can not be nitrated directly, why?)
Write the functional isomers of C3H6O with their IUPAC name. Give a chemical test to distinguish them.
Write an unsymmetrical ether of C3H8O. How would you prepare this ether using Williamson’s synthesis?
Write down possible isomeric amines of C3H9N and give their IUPAC names.

What happens when:

Sodium benzoate is heated with soda lime.
Phenol is heated with zinc dust.
Chlorobenzene is treated with chloral.
Ethyl alcohol(ethanol) is treated with acetic acid(ethanoic acid)
Phenol is treaded with aq. Br2.
Aniline is treated with aq. Br2.
Phenol is treated with benzene diazonium chloride.
Ethoxy ethane is treated with excess HI.
Methanal(formaldehyde) is treated with ammonia.
Methanal/benzaldehyde is treated with NaOH.
Ethanal/propanone is treated with NaOH.
Aldehyde/ketone is treated with hydroxyl amine.
Ethanol is heated with conc. H2SO4.
Acetic acid is treated with P2O5.

APPLIED CHEMISTRY

Write the flow sheet diagram for the production of cement.
Differentiate between OPC and PPC cement.
Write the flow sheet diagram for paper production.

Write monomers and one use of:

Bakelite
Nylon-6,6
polyvinyl chloride(PVC)
Teflon

Write an example and one use of:

Analgesic, antipyretic, antibiotics, and antiseptic drugs.
Herbicide and Pesticide
Germicide and Insecticide
A synthetic fertilizer – nitrogen fertilizer/Phosphorus (phosphatic) fertilizer, mixed(NPK) fertilizer.

Visit Again for New Questions of Class 12 Chemistry and thanks to chemical note for reference.

2 Reviews 2 Reviews

Iswori says:
Volumetric ko lagi Yo Hernuhola enough numbericals xa; ani teti dherai numberical ne aaudaina chemistry ma; aale aale matra aaune ho, https://www.iswori.com.np/2023/02/volumetric-analysis-class-12-chemistry.html
Anonymous says:
plese provide numericals as well

Class 12 Chemistry Important Questions & Topics NEB 2080