Chemistry · Some Basic Concepts Of Chemistry · NEET
In ancient India, chemistry was called Rasayan Shastra. It was also known by other names: Rastantra, Ras Kriya and Rasvidya. This is a direct one-line fact from NCERT, so remember the main word Rasayan Shastra. It included many practical fields like metallurgy (working with metals), medicine, and the making of cosmetics, glass and dyes.
Acharya Kanad (born 600 BCE), first known as Kashyap, was the first person to propose the 'atomic theory'. He said all substances are made of very small indivisible particles called Paramanu (this word is comparable to 'atom'). He wrote the text Vaiseshika Sutras. He said Paramanu are eternal, indestructible, and always in motion. Importantly, he proposed this about 2500 years before John Dalton (1766-1844). This is the single most NEET-relevant fact on this page.
Rasayan Shastra (ancient Indian chemistry) included metallurgy, medicine, and the manufacture of cosmetics, glass and dyes. So it was not just one topic — it mixed chemistry with daily-life and medical uses. The word to link in your memory: Rasayan = chemistry, and it covered metals + medicine + glass + dyes + cosmetics.
Nagarjuna was a great Indian scientist — a chemist, alchemist and metallurgist. His work 'Rasratnakar' deals with the formulation (making) of mercury compounds. He also discussed methods to extract metals like gold, silver, tin and copper. Memory tip: Nagarjuna + Rasratnakar + mercury compounds.
The Charaka Samhita mentions that ancient Indians knew how to prepare sulphuric acid, nitric acid, and oxides and sulphates of metals like copper, zinc and iron. The Sushruta Samhita explains the importance of alkalies. Both are medical texts, which shows chemistry and medicine were closely linked in ancient India — useful context for a NEET medical aspirant.
Kanad's Paramanu was a philosophical idea — he reasoned that matter must be made of indivisible particles, but he did not do experiments to measure them. John Dalton (18th century Europe) gave the modern atomic theory built on measurable laws (like laws of chemical combination). So Kanad had the IDEA first; Dalton gave the tested, scientific version much later.
NEET rarely asks a direct question on ancient Indian chemistry, and the real PYQs from this chapter test moles, stoichiometry and concentration instead. But it is part of the NCERT Chapter 1 text, and NCERT lines can appear as an easy statement-based question in Assertion-Reason format. The safest facts to remember are: Rasayan Shastra = chemistry, and Kanad's Paramanu came ~2500 years before Dalton.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Acharya Kanad (born 600 BCE), originally named Kashyap. He named the smallest indivisible particle 'Paramanu' and wrote the Vaiseshika Sutras.
Rasayan Shastra is the ancient Indian name for chemistry. It included metallurgy, medicine, and making of cosmetics, glass and dyes.
About 2500 years before John Dalton (1766-1844), according to NCERT.
According to the Charaka Samhita, they knew how to prepare sulphuric acid and nitric acid, plus oxides, sulphates and carbonates of several metals.
It is uncommon. Real PYQs from this chapter test moles, stoichiometry and concentration. But it is in NCERT, so learn the two key facts (Rasayan Shastra and Kanad's Paramanu) in case of a statement-based question.
