In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
(i) Assertion and reason both are true, reason is correct explanation of assertion.
(ii) Assertion and reason both are true but reason is not the correct explanation of assertion.
(iii) Assertion is true, reason is false.
(iv) Assertion is false, reason is true.
Assertion : Toxic metal ions are removed by the chelating ligands.
Reason : Chelate complexes tend to be more stable.