Class 12 NEET Chemistry Coordination Compounds

As the number of atoms of the ligands that are directly bound to the central metal is known as coordination number. It is six here (see in figure).
Oxidation state :
Let oxidation state of Cr be x.
⇒3(+1)+x+3(−2)=0 ⇒3+x−6=0
⇒x=+3