Classify the solid state of the following substances as ionic crystals, covalent crystals, molecular crystals, or metallic crystals:

(a) CO2

(b) B12

(c) S8

(d) KBr

(e) Mg

(f) SiO2

(g) LiCl

(h) Cr

There are four type of crystals possible in solids state, given as follows -

1. Ionic crystals -

In this type of crystals ionic bond is involved for the bonding between two atoms, which connects two oppositely charged atoms, i. e., cation and anion together.

The ionic crystal from the given options are -

(d) KBr and (g) LiCl.

2. Covalent crystals -

The bond formed in these type of crystals are from share the electrons, i. e. making a covalent bond.

Hence,

From the given options, the covalent crystals are -

(b) B₁₂ and (f) SiO₂.

3. Molecular crystals -

weak intermolecular forces, like the dispersion forces, holds the atoms together, generating a molecular crystal.

Hence,

From the given options, the molecular crystals are -

(a) CO₂ and (c) S₈

4. Metallic crystal -

The type of bond, which make up a metallic crystal is, the metal cation with the delocalized electrons.

Hence,

From the given options, the metallic crystals are -

(e) Mg and (h) Cr