List of top Environmental Studies Questions on Chemical Properties Of Metals

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Type B metal ions form more stable complexes compared to Type A metal ions.
Reasons (R): High electro-negativity (in relative terms) of metal and low electro-negativity of the legand donor atom would be consistent with stability of a complex with Type B metal ion.
In the light of the above Statements, choose the most appropriate answer from the options given below:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Stability of most complexes with the alkaline earth metals is in the order Mg²⁺ > Ca²⁺ > Sr²⁺> Ba²⁺ 
Reason R :For type A ions, Electrostatic model approximately explain the stability of metal-ligand complexes that is, stability of these complexes is positively correlated with the ratio of Z²/r for both metal ion and the ligand species. 
In the light of the above statements, choose the most appropriate answer from the options given below: