RAS Mains Rasayan Vigyan (RAS मेन्स रसायन विज्ञान), written by Biresh Sharma Sir and Vikas Gupta Sir and published by Ceramic Academy, covers chemistry for the RAS Mains examination. The complete book is written in Hindi (Devanagari script), so aspirants preparing in the Hindi medium can write the descriptive paper in their own language. This is the New Edition 2026. The book is fully revised as per the latest RAS 2026 syllabus (RAS 2026 के नवीनतम पाठ्यक्रम के अनुसार पूर्णतः संशोधित). Chemistry at the Mains stage is explained rather than solved — the paper asks what a process is and where it applies, in a few marks' worth of writing. A Hindi volume also settles the scientific terminology, which candidates otherwise have to translate themselves from English source material while writing under time pressure. Key Features: Written entirely in Hindi (Hindi medium) for RAS Mains aspirants Covers chemistry (रसायन विज्ञान) for RAS Mains Fully revised as per the new RAS 2026 syllabus New Edition 2026 Subject-specific volume for the RPSC RAS Mains descriptive paper By Biresh Sharma Sir and Vikas Gupta Sir, published by Ceramic Academy यह पुस्तक "RAS मेन्स रसायन विज्ञान" बिरेश शर्मा सर एवं विकास गुप्ता सर द्वारा लिखित है तथा सिरेमिक एकेडमी द्वारा प्रकाशित है। यह पूर्णतः हिंदी भाषा (Hindi medium) में है। यह नवीनतम संस्करण 2026 है तथा RAS 2026 के नवीनतम पाठ्यक्रम के अनुसार पूर्णतः संशोधित है। यह RPSC RAS मेन्स परीक्षा के अभ्यर्थियों के लिए अत्यंत उपयोगी है।