JEE Main Chemistry · p-Block Elements PYQ

JEE Main p-Block Elements PYQ (2002–2025)

Q: How many p-Block PYQs should I solve?

Target 70–90 PYQs across 2010–2025. Given the direct NCERT derivation, consistent practice builds strong recall patterns NTA tests.

Q: Is NCERT Class 12 Chapter 7 enough for p-Block?

Yes — NCERT Ch 7 (p-Block Class 12) plus selected portions from Ch 11 (p-Block Class 11) cover the full JEE Main syllabus for this chapter. Coaching notes add marginal value.

Q: Which group is most tested in PYQs?

Groups 15 and 17 — Nitrogen family and Halogens — together account for ~50% of p-Block PYQs. Focus here first.

Q: How detailed should my knowledge of silicones be?

Structure (-(R)₂SiO-), preparation via hydrolysis of R₂SiCl₂, physical properties (thermally stable, water-repellent), applications. NCERT coverage is sufficient.

Q: Do I need to memorise all oxoacids of sulfur?

Yes — H₂SO₃, H₂SO₄, H₂S₂O₇ (oleum), H₂S₂O₃, H₂S₂O₈ (persulphuric). Know structures, oxidation states of S in each, and preparation conditions.

Q: Why is noble gas chemistry relevant if they're called 'inert'?

Xenon forms compounds with F and O due to large size and low IE. XeF₂, XeF₄, XeF₆, XeO₃ appear in PYQs for structure, preparation and hybridisation questions.

p-Block Elements is a P1 Inorganic Chemistry chapter — ~5% JEE Main weightage with 1–2 questions per session. NCERT-line-derived and recall-heavy, the chapter spans 6 groups (13-18) with distinctive trends, compounds and anomalous first-row properties.

p-Block PYQs from 2002 to 2025, tagged by group and compound type. Every solution cites the NCERT Class 11/12 line or reaction scheme the question tests.

Practise p-Block Elements (Groups 13-18) PYQs All Chemistry PYQs

p-Block Elements (Groups 13-18) at a Glance

Weightage

~5%

approx · 10-yr avg

Priority

Must master

Year range

2002–2025

PYQ coverage

Typical in paper

1–2

per session

Key Sub-Topics & What's Tested

Group 13 (Boron Family)

Boron anomalies, boric acid (Lewis acid), borax structure, boranes (B₂H₆ banana bonds), aluminium chemistry (amphoteric oxide).

Group 14 (Carbon Family)

Catenation trend, diamond/graphite/fullerenes, silicon-silicates-silicones, lead's stability in +2 (inert pair effect).

Group 15 (Nitrogen Family)

N₂ inertness, oxides of nitrogen, HNO₃ preparation (Ostwald), phosphorus allotropes (white, red, black), phosphoric acids, phosphine.

Group 16 (Oxygen Family)

Ozone (preparation, properties), sulfuric acid (Contact process), oxides of sulfur, tellurium/polonium.

Group 17 (Halogens)

Reactivity trend (F > Cl > Br > I), interhalogen compounds, oxoacids of chlorine (HClO, HClO₂, HClO₃, HClO₄), anomalous fluorine.

Group 18 (Noble Gases)

Inertness reasons, noble gas compounds (XeF₂, XeF₄, XeF₆, XeO₃), xenon oxide structures, commercial uses of noble gases.

Anomalous Properties

First element of each group shows anomalous behaviour due to small size, high electronegativity, absence of d-orbitals.

Diagonal Relationship

B-Si, C-P, N-S diagonal similarities in properties. Due to similar charge/size ratios.

Question Type Distribution

Question Type	Share (approx)	Example Pattern
Compound Preparation / Property	30%	Identify product when concentrated H₂SO₄ reacts with NaCl.
Trend Identification	20%	Arrange HF, HCl, HBr, HI in order of increasing boiling point.
Anomalous Properties	15%	Why does fluorine not show positive oxidation states while chlorine does?
Structure Identification	15%	Identify the structure of Na₂B₄O₇·10H₂O (borax).
Reaction Product	10%	What is the product of hydrolysis of NCl₃?
Oxoacid Comparison	10%	Arrange oxoacids of chlorine (HClO, HClO₂, HClO₃, HClO₄) in increasing acidic strength.

How to Solve p-Block Elements (Groups 13-18) PYQs

1
Read NCERT Class 12 Ch 7 cover-to-cover, 3 times. p-Block questions are NCERT-line-level — three passes lock in phrasing NTA reuses.
2
Memorise group trends rigorously. IE, EA, electronegativity, atomic radius, metallic character — know direction of trend down each group and across each period.
3
Anomalous first-element behaviour: four reasons. Small size, high electronegativity, absence of d-orbitals, high charge density. Apply these to explain any anomaly.
4
For oxoacid acidity, more oxygens = more acidic. HClO < HClO₂ < HClO₃ < HClO₄. More oxygens pull electron density, stabilising conjugate base.
5
Manufacturing reactions: know key conditions. Ostwald (NH₃ → NO), Contact (SO₂ → SO₃ with V₂O₅ catalyst), Haber (N₂ + H₂ → NH₃) — temperature, catalyst, pressure.

Common Mistakes That Cost Marks

Reversing group trends down vs across. Electronegativity INCREASES across period, DECREASES down group. Confusing direction flips most answers.
Treating fluorine like other halogens. F has no positive oxidation states (most electronegative). F oxoacids are weaker than expected. Strong exception.
Wrong bond in diborane. B₂H₆ has 2 three-centre two-electron (banana) bonds plus 4 regular B-H bonds. Not just 6 regular bonds.
Forgetting inert pair effect for Group 14/15 bottom elements. Pb prefers +2 over +4 (opposite to C, Si). Bi prefers +3 over +5.
Confusing HNO₃ and HNO₂ reactions. HNO₃ is strong oxidising acid. HNO₂ disproportionates in water. Different behaviours.

JEE Main Chemistry PYQ Chapter-Wise

Browse PYQs across all Chemistry chapters.

JEE Main d- and f-Block PYQ

Inorganic partner chapter — transition-metal trends and compounds.

JEE Main Coordination Compounds PYQ

Inorganic partner chapter — complex formation uses d-block elements.

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Where the Inorganic block sits in the priority order.

JEE Main Chemistry Syllabus with Priority Tiers

Full Chemistry syllabus with branch split.

JEE Main Chemistry Mock Test

Full subject + Inorganic-block mocks.

Frequently asked questions

How many p-Block PYQs should I solve?