Official JEE Chemistry Revision Material: JEE Chemistry The P Block Elements Notes Set 01
Access comprehensive revision notes for P-Block Elements using the JEE Chemistry The P Block Elements Notes Set 01. Designed to align with the 2026-27 academic syllabus for JEE Chemistry, these concept summaries help students streamline their exam preparation and review complex topics efficiently.
Chapter-wise Concept Summaries: P-Block Elements
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Group 13: The Boron Family
Boron is a non-metal with a high melting point and an electron-deficient chemistry; the others are metals. The +3 state is common, but the +1 state becomes stable down the group (inert pair effect, strong in Tl). BX3 halides are Lewis acids because boron has a vacant orbital; the acidity order is BF3 < BCl3 < BBr3, owing to decreasing pi back-donation. Al2O3 is amphoteric, and Al dissolves in NaOH giving aluminate and H2. Conc. HNO3 makes Al passive. Anhydrous AlCl3 is a dimer, with chlorine bridges, in the vapour state.
Compounds of Boron
Diborane B2H6 has two terminal BH2 groups and two bridging three-centre two-electron B-H-B bonds. It is made from BF3 with LiAlH4 and burns in air. Ammonia gives unsymmetrical cleavage and tertiary amines give symmetrical cleavage to BH3 adducts. Boric acid B(OH)3 is a weak monobasic Lewis acid, since it accepts OH- from water. Borax Na2[B4O5(OH)4].8H2O gives a basic buffer in water and forms coloured metaborate beads with transition metal ions after heating. Borazine B3N3H6 is the inorganic benzene, but it is polar and reactive.
Group 14: The Carbon Family
Catenation is highest for carbon. The stability of the +2 state increases down the group (Sn(II) is a reductant, Pb(IV) is an oxidant). Carbon allotropes are diamond (sp3, hard, insulator), graphite (sp2 layers, soft, conductor), and fullerenes such as C60. CO is a neutral oxide and CO2 is acidic. Carbides are classified as ionic (CaC2, acetylide; Al4C3, methanide; Mg2C3, propynide), covalent (SiC, B4C) and interstitial (WC).
Silicon and Silicates
Silicates are built from SiO4 tetrahedra. Orthosilicates share no corner (SiO4 4-), pyrosilicates share one (Si2O7 6-), cyclic and single-chain silicates share two corners ((SiO3)n 2n-), double chain silicates share 2.5 on average, sheet silicates share three ((Si2O5)n 2n-) and 3D silicates share all four. Silicones are polymers of R2SiO units, made from R2SiCl2, with R3SiCl acting as chain stopper and RSiCl3 giving cross-links.
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P-Block Elements Concepts and Summary for JEE Chemistry
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