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) $BeCl_2$ : Presence of two bond pairs and lack of lone pairs gives it linear shape. Cl : Be : Cl (ii) $BCl_3$ : Presence of three bond pairs and lack of lone pairs gives it trigonal planar geometry. (iii) $SiCl_4$ : Presence of four bond pairs and lack of lone pairs gives it tetrahedral geometry. (iv) $AsF_5$ : Presence of five bond pairs and lack of lone pairs gives it trigonal bipyramidal geometry. (v) $H_2S$ : Presence of two bond pairs and two lone pairs gives it angular or bent shape. (vi) $PH_3$ : Presence of three bond pairs and one lone pair gives it trigonal pyramidal shape.