MCQ
How many $EDTA$ molecules are required to make an octahedral complex with a $Ca^{2+}$ ion?
- A$6$
- B$3$
- ✓$1$
- D$2$
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$\begin{array}{*{20}{c}}
{C{H_3} - CH - CH - CH - C{H_3}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,} \\
{OH\,\,\,\,\,\,\,OH\,\,\,\,\,OH\,\,}
\end{array}$


$A$ is