Question

Assertion- EDTA is a hexadentate ligand.
Reason- Denticity of a ligand is given by the number of lone pairs donated to the central atom by a ligand.
A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B) Both Assertion and Reason are correct but Reason is not correct explanation for Assertion
C) Assertion is correct but Reason is incorrect
D) Both Assertion and Reason are incorrect

Answer 1

Hint:The EDTA has six sites to donate the electrons. One uses this concept and applies it in both sentences of assertion and reason. One can relate the assertion and the reason sentences to find out the answer and make the correct choice.

Complete answer:
1) First of all we will learn about the chemical compound EDTA. The EDTA is a chemical compound that makes bonds and holds on to chelate minerals and metals.
2) The metals such as iron, aluminium, chromium, lead, copper, mercury, zinc, nickel, calcium, cobalt, magnesium, and manganese form the chelation with the chemical compound EDTA.
3) The full name of EDTA is Ethylenediaminetetraacetic acid which has six doner sites in its structure. This means that the EDTA is the hexadentate ligand. Therefore, the assertion statement is true.
4) Denticity of a ligand can be elaborated as the number of donor groups which are present in a single ligand that gets bound to a central atom present in a coordination complex. These donor groups are lone pairs of electrons which are rich electron species and EDTA has six lone pairs of electrons which make it hexadentate. Therefore, the reason statement is also true.
Therefore, Both Assertion and Reason are correct and Reason is the correct explanation for Assertion which shows option A as the correct choice.


Note: When EDTA is bound to any metal which can be an impurity in the body is removed from the body without having any further reactivity in the body. The EDTA is also used for the treatment of poisoning cases in humans who have been poisoned with heavy metal ions.