Among the following solids the number of ionic solid
(a) Tetra phosphorus deca-oxide (P4O10)
(b) Graphite (c) Brass
(d) Ammonium phosphate (NH4)3PO4
(e) SiC (f) Rb
(g) I2 (h) LiBr
(i) P4 (j) Si
(k) Plastic
Ionic: d, h; Metallic: c, f; Molecular: g,i,j: Covalent network: a,b, e: Amorphous: k.