There are several websites and platforms where you can find solutions to previous years' papers of UPSC Chemistry optional. One such platform is EduRev, which offers a wide range of study materials and resources for UPSC aspirants.

EduRev:
- EduRev is a comprehensive online learning platform that provides access to a vast collection of study materials, including previous years' papers and their solutions.
- The platform offers solutions to UPSC Chemistry optional papers from previous years, allowing aspirants to practice and understand the exam pattern.
- EduRev's solutions are prepared by subject matter experts who have deep knowledge and understanding of the UPSC Chemistry optional syllabus.
- The solutions provided on EduRev are detailed and comprehensive, covering all the important topics and concepts.
- The platform also allows users to interact with experts and ask questions related to the solutions or any other doubts they may have.

Benefits of using EduRev:
- Comprehensive Solutions: EduRev provides detailed solutions to previous years' papers, ensuring that aspirants have a clear understanding of the concepts and can analyze their performance.
- Exam Pattern Familiarity: By practicing with previous years' papers and their solutions, aspirants can become familiar with the exam pattern, types of questions, and the level of difficulty.
- Conceptual Clarity: The solutions provided on EduRev focus on explaining the underlying concepts and principles, helping aspirants develop a strong foundation in chemistry.
- Expert Guidance: The solutions are prepared by subject matter experts who have years of experience in teaching and guiding UPSC aspirants. Their expertise ensures accurate and reliable solutions.
- Interactive Learning: EduRev provides a platform for aspirants to interact with experts and ask questions, facilitating a collaborative learning environment.

To access the solutions to previous years' papers of UPSC Chemistry optional on EduRev, you can visit their website and search for the specific papers you are looking for. The solutions will be available for you to view and download, allowing you to practice and enhance your preparation for the UPSC Chemistry optional exam.