well, the chord is a simple one 
the song starts from -----

Tumse yun milenge
 (F)         (F)       
humne socha na tha
    (Am)     Bflat
aur yeh 
  (C)(E-3||(B-5)||(G-5)||(D-5)||(A)-3||(E)-3)
Zindagi
  (F)

Twice-----

mehakengi tumhari bahoon mein (twice)
  (F)         (Am)          (Dm)   

CHOROUS
 
tum tum the kahin 
   (F)      (Am)
the humare kuch nahi
   (E)          (Dm)
similarly hum.......nahi

itna chhota jahan 
 (E)        (Am)
ab achanak hua
  (F)       (Dm)
pehle kyun hue na tum mere
    (F)        (Am)     (Dm)

the song goes on..................