MCQ
The metals present in insulin and haemoglobin are respectively
- A$Zn, Hg$
- ✓$Zn, Fe$
- C$Co, Fe$
- D$Mg, Fe$
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$(1)$ Ligands are connected to the central metal ions by covalent bonds.
$(2)$ Secondary valencies have directional properties
$(3)$ Secondary valencies are non-ionisable Of these statements
$A$ and $B$ is