Question

16 one please help me

Answer 1

Metals are electropositive in nature since they have a tendency to lose electrons.As metallic character decreases, electronegative character increases. so order of electronegative character is D<A<C<B.

Metallic oxides are basic in nature and non-metallic oxides are acidic in nature.B is less metallic than A. So if A's oxide is amphoteric, B's oxide will be acidic in nature.