JEE Main Inorganic Chemistry: How to Remember It

Short answer: Inorganic Chemistry feels like endless facts, but in the current JEE Main syllabus it's only four units plus the salt analysis part of practical chemistry. Learn the trends and the reasons behind them, keep a separate list of exceptions, and revise with short, spaced recall sessions rather than long rereading. Most of the facts tested are in the NCERT Class 11 and 12 textbooks.

What the syllabus actually covers

According to NTA's JEE Main 2027 syllabus, Inorganic Chemistry is:

Unit	What's in it
Classification of elements and periodicity	Periodic trends: atomic and ionic radii, ionization enthalpy, electron gain enthalpy, valence, oxidation states
p-block elements (groups 13–18)	General trends across periods and down groups, and the unique behaviour of the first element in each group
d- and f-block elements	Trends in first-row transition elements (oxidation states, radii, colour, magnetic properties, catalytic behaviour), K₂Cr₂O₇ and KMnO₄, lanthanoid contraction, actinoids
Coordination compounds	Werner's theory, ligands, IUPAC names, isomerism, valence bond theory, basic crystal field theory, colour and magnetism
Practical chemistry (part)	Qualitative salt analysis of listed cations and anions, preparation of Mohr's salt and potash alum, KMnO₄ titrations

If you're studying from an older book, check it against the current syllabus at jeemain.nta.nic.in. Some chapters in older books, such as the s-block, hydrogen and metallurgy, aren't in the current units.

1. Learn the trend, then the reason

A fact you can explain is much easier to remember than one you've memorised alone. For each trend, write the rule and why it happens:

Ionization enthalpy increases across a period because nuclear charge increases while electrons enter the same shell.
Exception: Be > B and N > O. B's outer electron is in a 2p orbital, which is easier to remove than Be's 2s electron. N has a half-filled, more stable 2p³ configuration.
Cl has a more negative electron gain enthalpy than F. F is so small that an incoming electron is strongly repelled by the electrons already there.

When you understand the reason, an exception becomes a story rather than a random fact.

2. Keep one page of exceptions

Exceptions are where most Inorganic questions are set. Keep a single page, organised by unit, and add to it every time you meet one. A few examples:

Zr and Hf have almost the same atomic radius, because of the lanthanoid contraction.
Zn²⁺ (3d¹⁰) and Sc³⁺ (3d⁰) compounds are usually colourless: there are no d–d transitions possible.
KMnO₄ titrations need no separate indicator, because KMnO₄ is its own indicator.

3. Practise the calculations that are part of Inorganic

Some Inorganic questions are quick calculations, and they're reliable marks once you've practised them:

Spin-only magnetic moment: μ = √(n(n + 2)) BM, where n is the number of unpaired electrons. For Mn²⁺ (3d⁵), n = 5, so μ = √35 ≈ 5.92 BM.
Crystal field and unpaired electrons:
- [Fe(CN)₆]⁴⁻ has Fe²⁺ (3d⁶) with a strong-field ligand, so the electrons pair up: 0 unpaired, diamagnetic.
- [CoF₆]³⁻ has Co³⁺ (3d⁶) with a weak-field ligand: 4 unpaired, paramagnetic.

4. Learn salt analysis as a table

Make a table of test, observation and ion, and quiz yourself on it in both directions. For example:

Ion	Test	Observation
Cu²⁺	Excess ammonia solution	Deep blue solution
Fe³⁺	Potassium thiocyanate	Blood-red colour
Ca²⁺	Flame test	Brick-red flame
Ba²⁺	Flame test	Apple-green flame

Quiz yourself both ways: "what does Cu²⁺ give with excess ammonia?" and "a deep blue solution with excess ammonia means which ion?"

5. Revise with recall, not rereading

Rereading NCERT feels productive but fades quickly. Instead:

Read an NCERT section once carefully, including tables and in-text examples.
Close the book and write down what you remember: trends, reasons, exceptions.
Check against the book and add what you missed to your exceptions page.
Revise on a schedule: after 1 day, 3 days, 7 days and 14 days. Each session takes 15–20 minutes.

Twenty minutes of recall a day does more for Inorganic than a long weekend session. If you're following our 12-week plan, fit it into the daily mixed-practice slot.

Ask why until it makes sense

The fastest way to remember an Inorganic fact is to understand why it's true. ErodovAI's tutor explains trends and exceptions step by step with voice and a whiteboard, and you can keep asking "but why?" as long as you need. See the JEE Main Chemistry course, or all three subjects together.

The syllabus summary is from NTA's JEE Main 2027 syllabus; confirm the current version at jeemain.nta.nic.in. This is general study guidance, not a promise of any score or rank.