Chemistry paper I
- Atomic structure – this is a relatively easy topic. There are some basic concepts. You can refer to ‘Principles of Physical Chemistry’ by Puri, Sharma & Pathania for this section. Do go through the previous question papers for this section.
- Chemical bonding – this is the most important topic in this paper. For this section, you can read Physical Chemistry by KL Kapoor. Stick to the syllabus because this is a very vast topic which involves high level of mathematics (which is not at all relevant for UPSC). Some problematic topics in this section are molecular orbital theory and valence bond theory and their mathematical aspects. To tackle these, go through previous question papers and try to find out the answers from KL Kapoor, this would be sufficient.
Example question:
- What is an orbital and how is it related to probability density? (5 marks, 2018)
- Determine the geometry of [Ni(H2O)6]2+ (paramagnetic complex with two unpaired electrons) using valence bond theory. (5 marks, 2018)
- Point out the main features of the Valence Bond and Molecular Orbital theories. For the H2 molecule, write down the wave function using: (10 marks, 2014)
(i) Valence Bond Theory
(ii) Molecular Orbital Theory
3. Solid state – this is an easy topic and KL Kapoor would be enough for it. You can also refer to the NCERTs for this section as it explains the concepts in a simple manner.
4. Gaseous State and Transport Phenomenon – this is also an easy chapter and the UPSC has always asked very basic questions from here. The most important source for this section is Puri, Sharma and Pathania. In this section, collision theory is very important and even numericals are asked from this.
5. Liquid State – you can easily do it from KL Kapoor.
6. Thermodynamics – for this section, you can refer to Puri, Sharma and Pathania. Again, only basic questions are asked.
Example question:
- At constant pressure, the temperature of a fixed amount of hot tea in a cup decreases spontaneously to room temperature. What will be the sign of (I) ΔH and (II) ΔG of this process? Give reasons in support of your answer. (10 marks, 2018)
7. Phase Equilibria and Solutions – many candidates tend to ignore this section. That would be a mistake.
8. Electrochemistry – this is a very vast portion of the syllabus. You can refer to Puri, Sharma and Pathania or KL Kapoor for this section.
9. Chemical Kinetics – this section is generally easy. Sometimes, numericals are asked from the activation energy topic. Any basic book will cover this section.
Example question:
- What are the characteristics, essential for catalysis with specific reference to surface catalysis? (10 marks, 2018)
- Define activation energy, Ea of a chemical reaction. A gas-phase reaction completes 25% in 30 min at 27oC and in 10 min at 37oC. Determine the Ea in SI unit. (15 marks, 2018)
10. Photochemistry – this is largely based on chemical kinetics section. Even though not mentioned explicitly in the syllabus, do read Grotthuss–Draper law and Einstein’s law. Questions have been asked from these topics.
11. Surface Phenomena and Catalysis – you should study the derivations of all the theories here. You can refer to either KL Kapoor or Puri, Sharma and Pathania.
The above sections dealt with physical chemistry. The following deals with inorganic chemistry.
12. Bio-inorganic Chemistry – you can refer to Inorganic Chemistry by James Huheey. This is a very important book for entire inorganic chemistry.
13. Coordination Compounds – Huheey is sufficient for this topic.
Example questions:
- What is meant by EAN rule applied to complexes? Apply the concept of EAN rule on the following two complexes [Fe(CN)6]4- and [Fe(CN)6]3- and draw your conclusion about the validity of the rule. (10 marks, 2017)
14. Main Group Chemistry – for this section, NCERTs and Huheey are important.
15. General Chemistry of ‘f’ Block Elements – Huheey is sufficient for this topic.
Chemistry Paper II
Paper II deals with organic chemistry. This is a crucial section because with a little extra practice and conceptual clarity, you can score high marks.
- Delocalised Covalent Bonding – you can refer to Peter Sykes for Organic Chemistry.
- Reaction Mechanisms – this is a very important chapter in organic chemistry. In fact, it is very important to understand this concept as many topics are related to this. Peter Sykes is a good reference book for this topic.
In rearrangements and named reactions, you must focus on why the reaction is happening. Understand every step of the reaction. This will help you answer questions on them. You must literally mug up the named reactions for the exam.
Example questions:
- With suitable example, comment whether Fries Rearrangement proceeds intermolecularly or intramolecularly. Give evidence in favour of your answer. (5 marks, 2018)
3. Pericyclic Reactions – you can refer to Organic Chemistry by Clayden or Peter Sykes for this topic.
4. Polymers – questions are asked every year from this section. Do not leave any topic from here.
Example questions:
- Give the synthetic schemes including reaction conditions for the preparation of the following polymers from their monomers: (15 marks, 2018)
(i) Nylon 66
(ii) Teflon
(iii) Terylene
- Distinguish between RNA and DNA with regard to their nucleotide structures, location in the cells and functions. (10 marks, 2018)
5. Synthetic Uses of Reagents – this is a very easy and scoring section. Questions are asked every year mostly.
6. Photochemistry – you must practice questions for this section specifically. This is tricky as it deals with free radicals and they can react anytime with anything! But, practice should help you here, and also the UPSC does not ask very vague questions from here. Photochemistry and Pericyclic Reactions by Jagdamba Singh is good for this.
7. Spectroscopy – refer to previous question papers to understand the type of questions asked from here. The book recommended for this is Spectroscopy of Organic Compounds by PS Kalsi. Here, some question types that are repeated are to calculate the lambda max, mass spectra, NMR (structure and signals), and IR spectra reasoning.