A new series of novel 5-(5-methyl-1-phenyl-1H-1,2,3-triazol-4-yl)-1-aryll-1H-1,2,3,4-tetrazole 7(a-j) in good to excellent yields by the reaction of N4,1-diphenyl-5-methyl-1H-1,2,3-triazole-4-carboxamide 6(a-j) with a reaction of phosphorous pentachloride in carbon tetrachloride at reflux to obtain the intermediate imidoyl chloride, which were reacted with sodium azide in DMF at room temperature. The compounds of all the novel new compounds were established by IR, 1H, 13C NMR, MS and elemental data.The compounds 7(a-j) were evaluated for their antibacterial activity againist four human pathogenic bacteria viz. Gram-positive bacteria viz. Bacillus subtilis, Bacillus sphaericus and Staphylo- coccus aureus and three Gram-negative bacteria viz. Pseudomonas aeruginosa, Klebsiella aerogenes and Chromobacterium violaceum. Amongst them, compounds containing (4-nitrophenyl) moiety 7c, (4-fluorophenyl) moiety 7f, (4-bromophenyl) moiety 7g showed significant antibacterial activity, almost equal/more than the activity activity of the standard drug Sterpomycin and Penicillin. All the compounds displayed significant activity againist E. coli. Most of the novel new compounds showed appreciable activity againist test bacteria as potential molecules for further development.