Question

Which is Solid between Silicon Di Oxide(SiO2) & Carbon Di Oxide(CO2)?Explain.

Answer 1

Answer on Question #45672 - Chemistry - Inorganic Chemistry

Question

Which is Solid between Silicon Di Oxide(SiO₂) & Carbon Di Oxide(CO₂)? Explain.

Answer:

Silicon and carbon are in the same group in the Periodic table and are expected to show the same properties. But these elements have different atomic radii. Carbon has smaller atomic radius, than silicon, so carbon can easy form double bond with oxygen. That's why each carbon atom in CO₂ molecule is double bonded to two oxygen atoms, so, CO₂ consists of individual molecules and they are free to move, i.e. CO₂ is a gas.

Silicon has bigger atomic radius, so it can form only single bonds with oxygen, not double. Each silicon atom is single bonded to four oxygen atoms and each oxygen atom is single bonded to two silicon atoms. As a result, the particles in SiO₂ are not free to move, and SiO₂ forms a network solid.

So, silicon dioxide (SiO₂) is the solid substance and carbon dioxide (CO₂) is the gaseous substance.

Answer:

Silicon dioxide (SiO₂) is the solid substance.

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