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CO(2) exists in the gaseous state, where...

`CO_(2)` exists in the gaseous state, whereas `SiO_(2)` is a hard solid though both carbon and silicon belong to the same group. Give reasons.

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To understand why CO₂ exists as a gas while SiO₂ is a hard solid, we need to analyze the nature of their structures and bonding. ### Step 1: Identify the molecular structure of CO₂ CO₂ (carbon dioxide) is a molecular compound. It consists of individual CO₂ molecules that are held together by weak intermolecular forces (specifically van der Waals forces). ### Step 2: Identify the molecular structure of SiO₂ SiO₂ (silicon dioxide), on the other hand, has a giant covalent structure. In this structure, each silicon atom is covalently bonded to four oxygen atoms in a three-dimensional lattice. This creates a strong network of bonds throughout the solid. ...
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Knowledge Check

  • Silicon is the second most abundant element (~27.2%) in the earth's after oxygen (45.5 %) Carbon. Silicon, germanium, tin and lead constitute the group 14 of the periodic table. Chemistry of silicon is distinctly different from that of carbon. For example, under standard conditions CO_(2) is a gas whereas SiO_(2) is a covalent solid. In zone refining, silicon is purified as (a)portions of Si rod are heated and cooled so that impurities are differentially evaporated (b)impurities are more soluble in liquid phase than in solid ( c)impurities are less soluble in liquid phase than in solid (d)impurities are insoluble in molten Si and can be separated

    A
    portions of Si rod are heated and cooled so that impurities are differentially evaporated
    B
    impurities are more soluble in liquid phase than in solid
    C
    impurities are less soluble in liquid phase than in solid
    D
    impurities are insoluble in moiten Si and can be separated

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