🧪 JEE Main Chemistry — p-Block Elements

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Previous year questions for p-Block Elements with detailed solutions

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📝 Mock Test

Chapter mock test for p-Block Elements based on latest NTA pattern

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📚 Notes

Concise notes with all important formulas and concepts for p-Block Elements

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🔥 Top Repeated Questions

Most frequently asked p-Block Elements questions across all JEE Main sessions

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p-Block Elements — Overview for JEE Main

p-Block Elements is an important chapter in JEE Main Chemistry. Every mark matters for your JEE Main rank.

This page provides PYQs with solutions, chapter mock tests, concise formula notes, and the most frequently repeated questions from p-Block Elements across all JEE Main sessions.

Key Topics in p-Block Elements

Groups 13-18 properties
Oxoacids of sulphur & phosphorus
Interhalogen compounds
Noble gas chemistry
Reaction of halogens

How to Prepare p-Block Elements for JEE Main

Step 1 — NCERT First: Read the NCERT chapter completely. Understand every concept and formula derivation before moving to reference books.

Step 2 — Practice Book: For Physical Chemistry chapters, solve numericals from Narendra Awasthi or OP Tandon. For Organic, study mechanisms from MS Chauhan. For Inorganic, NCERT reading with JD Lee supplementation is sufficient.

Step 3 — PYQ Practice: Use the PYQ link above to practice all previous year questions for p-Block Elements. Identify the most common question types and master them.

Step 4 — Timed Mock Test: Take the mock test above under exam conditions. Target under 2 minutes per question. Analyse every mistake immediately.

Frequently Asked Questions

What are the important oxoacids of sulphur? +

H₂SO₃ (sulphurous acid, +4), H₂SO₄ (sulphuric acid, +6), H₂S₂O₇ (oleum/pyrosulphuric, +6), H₂S₂O₈ (peroxodisulphuric/Marshall's acid, +7), H₂SO₅ (Caro's acid, +8). Key reactions: conc. H₂SO₄ is dehydrating agent and oxidizing agent. SO₂ is acidic oxide — reacts with NaOH to form Na₂SO₃. JEE Main tests oxidation states and reactions of sulphur compounds extensively.

What are the important oxoacids of phosphorus? +

H₃PO₂ (hypophosphorous, +1, monobasic), H₃PO₃ (phosphorous, +3, dibasic), H₃PO₄ (phosphoric, +5, tribasic), H₄P₂O₇ (pyrophosphoric, +5). The basicity of phosphorus oxoacids equals the number of P-OH bonds — not total H atoms. H₃PO₂ has two P-H bonds that are non-ionizable. These distinctions are directly tested in JEE Main.

What are interhalogen compounds? +

Interhalogen compounds are formed between two different halogens: XX', XX'₃, XX'₅, XX'₇ (where X is heavier halogen). Examples: ClF, ClF₃, ClF₅, BrF₃, BrF₅, BrF₇, IF₇. They are generally more reactive than individual halogens. Shapes follow VSEPR: ClF₃ is T-shaped (sp³d with 2 lone pairs), ClF₅ is square pyramidal (sp³d² with 1 lone pair). JEE Main frequently asks shapes and hybridization of interhalogen compounds.

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