Question

the number of 5-membered ring in [Ca(edta)]2- is A)5 B)6 C)7 D)8

Answer 1

ANS:

      So number of rings that are present in   [Ca(EDTA)]2⁻  are 5.  please refer the attached image for clarity

       Now let us discuss about what is  [Ca(EDTA)]2⁻  which a

       negatively charged divalent anion as given according to

       question.

What is the full form of EDTA?

Ethylene Di-amine tetra acetic acid..

EDTA is a chelating agent , chelating agent are those molecules which has a tendency to bind several other metal and non metals ions with then and i order to so so they form a closed ring like structure which are very strong and chemically stable at normal room temperature at most of the times