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.

i would say b

explanation:

but i think i would need more information than that

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer