which is the scoring subject in iit jee?

On analysing last few years results it was observed that chemistry is always the dec-iding subject for better rank and one has to put little more efforts in the subject. Here we will look at the best manner in which chemistry can be revised. Analysis of previous papers of IIT-JEE, it is quite clear that chemistry is scoring subject in terms of time invested and marks obtained.

The entire syllabus of chemistry is divided into three major units, namely physical & general chemistry, inorganic and organic chemistry. All these are equally important. This can be evidenced by analysing last 5 years papers.
Let us have a glance of the syllabus in the order of priority. 

+ Physical chemistry:
This part of chemistry is generally given more weightage. Physical chemistry chapters are not theoretical and memory based rather they are more conceptual and problem based. It is advisable to follow the given order of priority and emphasize on the topics mentioned in each chapter during your final revision. 

+ Electrochemistry: 
Application of Nernst equation, batteries, relation between thermodynamic quantities & EMF and application of Kohlrausch law.

+ Ionic equilibrium:
Solubility Product and factors influencing solubility of a sparingly soluble salt, hydrolysis of salts, buffer, indicator theory, and simultaneous equilibria based problems

+ Chemical kinetics:
First order equation with its application, graph related problems and temperature effect on rates of reactions. 

+ Colligative properties:
Mostly formula based problems will be asked on CP. Don't forget to have a look in to Von't Hoff factor. 

+ Gaseous and solid state:
Behavior of real gases, Vander waals equation, diffusion, Unit cell parameters (such as edge length in terms of radius, packing fraction, CN, density and types of voids), structure of ionic crystals and defects 

+ Chemical bonding:
Questions on chemical bonding find a place every year. It is absolutely necessary to prepare a table containing essential data to be used as a ready reckoner and a quick glance. Problems related with bond angles, dipole moment, geometries, molecular orbital theory and bond order calculation are need to be revised.

+ Thermo chemistry and thermodynamics: entropy calculation and free energy calculation, Hess' law applications, resonance energy calculation. Revise all the formulae of physical chemistry, with their applications and short cut methods. 

It will help you to score faster in formula based questions. It is more advisable that now solve multi conceptual problems. Also do not limit up your practice to only selected chapters, better solve miscellaneous type exercises which give exact simulation of examination. 

+ Organic chemistry:
This part also takes good weightage in chem-istry paper. It is more conceptual and complet-ely theoretical hence more attention has to be paid on this topic. 

Questions are more frequently asked from the following topics.

l Acid-base strengths and reaction intermediates.
l Geometrical and optical isomerism. 
l Elimination reactions and Electrophilic addition reactions.

l Electrophilic substitution reactions. 
l All named reactions from carbonyl compounds.
l Phenols and diazonium salts.
l Very basic information about Carbohydrates, amino acids and polymers.

Try to confine to the topics and named reac-tions given in syllabus. This is not the time to read all the information given in text books. 

Mechanism of all the named reactions included in syllabus must be known thoroughly. Practice more problems based on chemical equations and problems involving identification of unknown compounds. Every year problems based upon identifying the compounds were asked.

+ Inorganic chemistry:
The weightage of inorganic is increased in the last two years papers and we can not ignore this section. The main chapters/topics which one should emphasize are...

l Coordination compounds: Geometrical iso-merism, IUPAC nomenclature, VBT to predi-ct the structure of coordination compounds as well as their magnetic behavior

l Metallurgy: Make simple memory grids on ores and extraction procedures. This won't take more than an hour to go through.

l Chemistry of non metals: This is one of the most important areas where from 2 to 3 questions were asked in previous exams.

Try to concentrate on Occurrence and isola-tion of B, Si, N, P, S. Properties and structure of hydrides, halides, oxides and oxyacids.

l Qualitative analysis: Confine to the analysis of ions given in syllabus. Try to list down as many reactions as possible for these ions, which indirectly enhance your strength in chemistry of elements. 

l Chemistry of metals: Finally you can have a look into the properties of Oxides, Hydro-xides, Halides, Carbonates, Bicarbonates and sulphates of alkali and alkaline earth metals. 

The pattern of the IIT JEE paper has seen a major change in the last few years. The same subject with full coverage of the syllabus has to be answered in both the sessions of the examination on the same day.

The aim of a student is not to answer all the questions. An average student can aim at at-tempting 60% questions with 90% accuracy, then a reasonably good rank is assured.

Passages for comprehension-based questions are generally not adequate to give all the information needed to answer the questions that follow. Matrix matching type questions need particular attention as either you score full marks or you end up with a naught.

ElECTRO CHEMISTRY
l This is most important and generally bigger chapter with three main topics.
l Generally problems on Faraday's Laws and Conductance are easy and less confusing.
l Concentrate more on Electrochemical cells and EMF calculations as this part is more important.
l Remembering formulas may not help in solving the problems. Proper understanding of construction and working of electrodes may help. 

+ Faraday's Laws of Electrolysis:
l 1st Law: The weight of a substance depos-ited is directly proportional to the quantity of electricity passed through the electrolyte.
W µ Q, where Q = I × t \W = ZQ.

Z is a constant known as electro chemical eq-uivalent. It is the weight in grams of a subs-tance deposited by one coulomb of electricity.
l IInd Law: When the same quantity of electr-icity is passed through different solutions, the weights of different substances deposited at the electrode are directly proportional to their chemical equivalent weights.
Wµ E, or WA/WB= EA/ EB
Combining the two laws we get, WµQE. o

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