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CO₂ is gas while SiO₂ is solid at room temperature

Correct answer: B. CO₂ is an independent molecule while SiO₂ has a network covalent structure

  • A. Carbon is a non-metal while silicon is a semi-metal
  • B. CO₂ is an independent molecule while SiO₂ has a network covalent structure
  • C. Carbon forms multiple bonds while silicon does not form multiple bonds
  • D. Silicon has all sigma bonds

Explanation

The physical states of CO₂ and SiO₂ at room temperature are primarily determined by their molecular structures. CO₂ is a gas because it consists of independent molecules held together by weak forces. On the other hand, SiO₂ is a solid due to its network covalent structure where silicon atoms are bonded to oxygen atoms in a 3D network. This network covalent bonding is the reason for SiO₂'s solid state. Option B is correct as it highlights this key difference in molecular structure. Option A is incorrect as the elemental nature of carbon and silicon is not directly related to their states. Option C is partially relevant but doesn't address the primary factor of molecular structure. Option D focuses on bond types rather than the network structure of SiO₂.

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About s-Block and p-Block Elements

The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.

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