JEE Advanced: Group 18 Noble Gases - ChemCa

JEE Advanced: Group 18

Noble Gas Compounds & Xenon Chemistry for chemca.in

The Bartlett Discovery

Neil Bartlett noticed that PtF₆ oxidizes O₂ to O₂⁺. Since the first Ionization Enthalpy of Xenon (1170 kJ/mol) is nearly identical to Oxygen (1175 kJ/mol), he successfully prepared the first noble gas compound:

Xe + PtF₆ → Xe⁺[PtF₆]^-

Molecular Geometries

XeF₂: Linear (sp³d, 3 lone pairs).

XeF₄: Square Planar (sp³d², 2 lone pairs).

XeF₆: Distorted Octahedral (sp³d³, 1 lone pair).

JEE Advanced: Group 17 Halogens - ChemCa

JEE Advanced: Group 17

Halogen Family Reactions & Interhalogens for chemca.in

Oxidizing Power Trend

Trend: F₂ > Cl₂ > Br₂ > I₂.

F₂ is the strongest oxidizing agent. It oxidizes H₂O to O₂ (or O₃), while I₂ is oxidized by concentrated HNO₃ to HIO₃.

Interhalogen Properties

Reactivity: Interhalogens are generally more reactive than pure halogens (except F₂) due to weaker X-X' bonds.

Hydrolysis: XX' + H₂O → HOX' + HX (The smaller halogen forms halide, larger forms oxoacid).

JEE Advanced: Group 16 Oxygen Family - ChemCa

JEE Advanced: Group 16

Oxygen Family Reactions & Chalcogen Trends for chemca.in

Sulfur Allotropes

Rhombic (α-S) is stable at room temperature. It transforms to Monoclinic (β-S) above 369 K (Transition Temperature).

Both contain S₈ rings, but the arrangement of rings differs.

Oxidizing Properties

Ozone: Second most powerful oxidant after Fluorine. Oxidizes PbS to PbSO₄.

H₂SO₄: Hot, conc. H₂SO₄ is a moderately strong oxidizing agent (Intermediate between HNO₃ and H₃PO₄).

JEE Advanced: Group 15 Nitrogen Family - ChemCa

JEE Advanced: Group 15

Nitrogen Family Reactions & Trends for chemca.in

Oxidation State Trends

Stability of +5 state decreases down the group due to the Inert Pair Effect.

Bi⁵⁺ is a very strong oxidizing agent. Nitrogen is unique as it can show all oxidation states from -3 to +5.

Phosphorus Allotropes

White P: Discrete P₄ tetrahedra, highly reactive (stored in water), glows in dark.

Red P: Polymeric chain of P₄ units, non-toxic, used in matchsticks.

Black P: Most stable, thermodynamic allotrope with layered structure.

JEE Advanced: Group 14 Carbon Family - ChemCa

JEE Advanced: Group 14

Carbon Family Reactions & Structures for chemca.in

Inert Pair Effect

Stability of +2 state increases down the group: Ge < Sn < Pb.

Consequently, Pb⁴⁺ is a powerful oxidizing agent, while Sn²⁺ is a strong reducing agent.

Silicate Structures

Orthosilicates: Discrete SiO₄^4- units (No shared oxygens).

Pyrosilicates: Two units share one oxygen (Si₂O₇^6-).

Sheet Silicates: Three oxygens shared per tetrahedron.

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