Biochar was produced from Annona muricata and Magnifera indica by co-pyrolysis at a heating rate of 5oCmin-1, residence time (tr) of 45mins and 2hours, and pyrolysis temperatures (Tp) of 350, 400 and 500oC . Co-pyrolyzed biochar were chemically and physically activated with KOH and CO2 respectively at 850oC for 75min. The specific surface area (as,BET) of biochar were analyzed by Brunauer-Emmett-Teller (BET) method using nitrogen adsorption at 77K. Functional group were analyzed using FT-IR spectroscopy. The chemically and physically activated carbon had as,BET values of 18.30m2g-1 and 574.63m2g-1 for high tr, while 228.20m2g-1 and 810.55m2g-1 for low tr. The porous carbons had peaks corresponding to N-H/O-H, C=O, C-O, and C=C bonds. Negative correlation exited between Tp and peak intensity in the biochar. The as,BET for all samples were high at low tr. Physical activation greatly increases the surface area of the biochar, thus increasing its industrial potential.