NDA Chemistry Notes

Carbon is the largest chapter in NDA Chemistry — 46 PYQs across 2017–2026, almost all EASY or MODERATE, and almost all pure named-fact recall.

Mostly EASY and MODERATE, and split between pure recall — who discovered the neutron, how many electrons a shell holds — and short calculations like average atomic mass.

Acids, Bases and Salts is a pure recall chapter in NDA Chemistry — 36 PYQs across 2017–2026, almost all EASY or MODERATE.

Matter and Its States is the foundation chapter of NDA Chemistry — 32 PYQs across 2017–2026, almost all EASY or MODERATE, and almost all pure named-fact recall and classification.

Chemical Reactions is the most reasoning-heavy chapter in NDA Chemistry — 32 PYQs across 2017–2026 with the highest share of HARD questions, almost all of them carried by redox.

Industrial Chemistry is pure named-fact recall — 28 PYQs across 2017–2026, almost every one a 'which is correct / which is NOT' about a manufactured gas, a fertilizer, a building material, a paint additive, or an alloy.

This is the one calculate-it chapter of NDA Chemistry — small in question count (9 PYQs across 2017–2026) but the only place the paper asks you to do arithmetic rather than recall a fact.

Metals and Non-Metals is a compact recall chapter — about 18 PYQs across 2017–2026, almost every one a 'which is correct' or 'which is NOT' about reactivity, an ore, corrosion, or an alloy.

A small, high-recall chapter — about a dozen PYQs across 2017 to 2025, almost all 'which one of the following' or 'which statement is NOT correct' named-fact questions.

Chemical bonding is a small but concept-dense chapter in NDA Chemistry — about a dozen PYQs, mostly EASY and MODERATE, and almost all answerable from a few core ideas held firmly.

Chemistry in Everyday Life is a small, pure named-fact recall chapter — about ten PYQs across 2017–2026, almost every one a 'which chemical / which medicine / which gas' single-fact question.