Which of the following substances has a giant covalent structure?

The radii and charges of six ions are given below:

Ion	$J^{+}$	$L^{+}$	$M^{2+}$	$X^{-}$	$Y^{-}$	$Z^{2-}$
Radius $(nm)$	$0.14$	$0.18$	$0.15$	$0.14$	$0.18$	$0.15$

If the ionic compounds $JX$,$LY$,and $MZ$ have the same crystal structure,then the correct order of their lattice energy is:

Dry ice is an example of

Which of the following structural features of graphite best accounts for its use as a lubricant?

Which substance has the strongest London dispersion forces?

Among the following,which is the best description of water in the solid phase?