Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous.

(i) Tetra phosphorous decoxide (P4O10): molecular

Explanation:  Molecular solids are made up on molecules or inert gases.

(ii) Ammonium phosphate (NH4)3PO4: Ionic

Explanation: Ionic solids are those in which constituents particles are cations and anions which are held together by coulombic force of interactions 

e.g.- K2SO4  ⇒ K+  +  SO4—

(iii) SiC: Covalent (network)

Explanation: In covalent solids constituent particles are atoms which are held together by continuous system of covalent bonds.

(iv) I2 :molecular

Explanation:  Molecular solids are made up on molecules or inert gases.

(v) P4: Molecular

Explanation:  Molecular solids are made up on molecules or inert gases.

(vi) Plastic: Amorphous

Explanation: Amorphous solids are not true solids, in these solids the constituent particles (atoms, ions or molecules) have short range order of arrangement.

(vii) Graphite: Covalent (network)

Explanation: In covalent solids constituent particles are atoms which are held together by contineous system of covalent bonds.

(viii) Brass: Metallic

Explanation: Metallic solids are metals in which metal ions (also called kernals) are held together by metallic bonds.)

(ix) Rb: Metallic

Explanation: Metallic solids are metals in which metal ions (also called kernals) are held together by metallic bonds.)

(x) LiBr: Metallic

Explanation: Metallic solids are metals in which metal ions (also called kernals) are held together by metallic bonds.)

(x) Si : Covalent (network)

Explanation: In covalent solids constituent particles are atoms which are held together by contineous system of covalent bonds.