Which of the following statements comparing CO2 and SiO2 are correct?

CO2 is a gas of discrete molecules, whereas SiO2 is a covalent network solid.

Each Si in quartz is bonded tetrahedrally to four oxygens.

SiO2 has a far higher melting point than CO2 because many strong Si--O bonds must be broken.

CO2 is a gas of discrete molecules, whereas SiO2 is a covalent network solid.

Silicon forms stable ppi-ppi multiple bonds with oxygen as readily as carbon does.

Each Si in quartz is bonded tetrahedrally to four oxygens.

SiO2 has a far higher melting point than CO2 because many strong Si--O bonds must be broken.

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pb091

Which of the following statements comparing $CO X_{2}$ and $SiO X_{2}$ are correct?

A $CO X_{2}$ is a gas of discrete molecules, whereas $SiO X_{2}$ is a covalent network solid.
BSilicon forms stable $p π$ - $p π$ multiple bonds with oxygen as readily as carbon does.
CEach Si in quartz is bonded tetrahedrally to four oxygens.
D $SiO X_{2}$ has a far higher melting point than $CO X_{2}$ because many strong Si--O bonds must be broken.

Carbon forms

p π

p π

double bonds in

O = C = O

, giving small molecules held by weak forces. Silicon is larger and its

p π

p π

overlap with oxygen is poor, so it prefers four single Si--O bonds, giving a network of

SiO X_{4}

tetrahedra. Melting the network requires breaking strong covalent bonds. Statements 1, 3 and 4 are correct.