According to VSEPR theory, the shape of molecule depends upon the number of valence shell electron pairs (bonded or non bonded) around the central atom.
(i) BeCl2 : Presence of two bond pairs and lack of lone pairs gives it linear shape.
Cl : Be : Cl
(ii) BCl3 : Presence of three bond pairs and lack of lone pairs gives it trigonal planar geometry.

(iii) SiCl4 : Presence of four bond pairs and lack of lone pairs gives it tetrahedral geometry.

(iv) AsF5 : Presence of five bond pairs and lack of lone pairs gives it trigonal bipyramidal geometry.

(v) H2S : Presence of two bond pairs and two lone pairs gives it angular or bent shape.

(vi) PH3 : Presence of three bond pairs and one lone pair gives it trigonal pyramidal shape.