Q. The IUPAC name of is

 2772  237 MP PMTMP PMT 2001Coordination Compounds Report Error

Solution:

IUPAC name of is potassium trioxalatoiridate (III)
Let O.S. of Ir -
3(+ 1) + + 3(-2) = 0
= + 3
[O.S. of = +1. O.S. of = -2]