Iupac name of the given structure
Q16. $\left[{\left(N{H}_3\right)}_{5}Cr—OH—Cr{\left(N{H}_3\right)}_5\right]Cl$

Dear Student,

Here, OH is a bridging ligand. The bridging ligand is indicated by adding prefix μ. 
There are 10 ammine ligands, so it will be decaammine.
Therefore, IUPAC name of the compound will be decaammine-​μ-hydroxochromium(III) chloride