Solve all question

here are the remaining answers:

Q3. Which of the following is a bidentate ligand?
A bidentate ligand is a ligand that can form two coordinate bonds with a central metal ion.

• A. H$_2$O (water) is a monodentate ligand.
• B. NH$_3$ (ammine) is a monodentate ligand.
• C. en (ethylenediamine) is a bidentate ligand, as it has two nitrogen atoms that can each donate a lone pair.
• D. Cl$^-$ (chloro) is a monodentate ligand.
• E. CN$^-$ (cyano) is a monodentate ligand. The correct option is C. en (ethylenediamine).

Q8. Study the coordination compound below.
The compound is $\text{K}_4[\text{Fe}(\text{CN})_6]$.