There are several chapters and topics in the Chemistry syllabus that are considered to be more scoring in the UPSC examination. These topics are relatively easier to understand and require less time to master. Here are some of the chapters and topics that fall under this category:

1. Atomic Structure:
- Structure of the atom
- Subatomic particles
- Atomic models
- Quantum numbers
- Aufbau principle and Pauli's exclusion principle
- Electronic configuration

2. Chemical Bonding:
- Ionic and covalent bonding
- Lewis dot structure
- VSEPR theory
- Hybridization
- Molecular orbital theory
- Metallic bonding

3. Thermodynamics:
- Laws of thermodynamics
- Enthalpy and entropy
- Gibbs free energy
- Spontaneity of reactions
- Hess's law
- Standard enthalpy of formation

4. Chemical Equilibrium:
- Equilibrium constant
- Le Chatelier's principle
- Factors affecting equilibrium
- Acid-base equilibrium
- Solubility equilibrium
- Common ion effect

5. Electrochemistry:
- Redox reactions
- Electrochemical cells
- Nernst equation
- Conductance and conductivity
- Electrolysis
- Corrosion

6. Organic Chemistry:
- Nomenclature of organic compounds
- Isomerism
- Functional groups
- Alkanes, alkenes, and alkynes
- Alcohols, phenols, and ethers
- Carboxylic acids and their derivatives

7. Environmental Chemistry:
- Pollution types and sources
- Air pollution and control measures
- Water pollution and treatment
- Soil pollution and remediation
- Green chemistry
- Ozone depletion and global warming

These chapters and topics are important not only because they are relatively easier, but also because they have a high weightage in the UPSC examination. By focusing on these topics and mastering them, candidates can ensure a good score in the chemistry section of the exam. However, it is important to note that all topics in the syllabus are important and should be studied thoroughly to have a comprehensive understanding of the subject.