Which among the following is NOT TRUE regarding solutions? A.
a solution is a homogeneous mixture of two or more components

B.
in a liquid solution the solution particles can be ions, atoms or molecules and never settle on standing

C.
the solution particle size is much smaller than colloidal particle.

D.
solution particles can be separated by filtration.

E.
air is a gaseous solution of gases, chiefly oxygen and nitrogen.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."