Question

$Si{O}_2$ is a covalent solid. Which of the following is most likely to be true regarding $Si{O}_2$?

• A. It has a low melting point and it conducts electricity when melted
• B. It conducts electricity as a solid and its melting point cannot be predicted
• C. It has a high melting point and it conducts electricity when melted
• D. It has a high melting point and it doesn’t conduct electricity when melted

Answer 1

The correct option is D It has a high melting point and it doesn’t conduct electricity when melted

In $Si{O}_2$, the silicon and oxygen shares electrons pairs between them. Each silicon atom is covalently bonded to four oxygen atoms. Because of the absence of free electrons, covalent compounds won't conduct electricity in its solid state and molten state. An exception to this is graphite.