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Q. The coordination number and oxidation state of ( in $K_3[Cr(C_2O_4)_3]$ are respectively

Solution:

The coordination number will be 6 as it is bonded to three bi-dentate ligands. $x + 3 (- 2) + 3 ( + 1) $= 0 $i.e.,\, x$ = + 3 (oxidation state)