As 0.1 M HCl is added to 0.1 M KOH, then pH of the basic solution

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Answer the same molecular formula;

Hey : )a transition from the first energy level to the fourth energy level

Im here for points, sorry i dont have the answer ; /