Silicon is found in nature in the form of

Which of the following can act as a $p-$type semiconductor?

Some substances are given below:
$Ag$; $CO_{2(s)}$; $SiO_2$; $ZnS$;
$SO_{2(s)}$; $AlN$; $HCl_{(s)}$; $H_2O_{(s)}$
The number of molecular solids and network solids in the above list is respectively

Which of the following is an example of an ionic solid?

Solid $NaCl$ is a bad conductor of electricity since:

Which of the following cuts ultraviolet rays?