If a substance is reduced, it must undergo a: a. gain of electrons.
b. gain of hydrogen.
c. loss of oxygen.
d. gain of oxygen.
e. loss of electrons.

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution