If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3 hydrochloric acid, the concentration of the acid will change to
Biotechnology is applied in the following except
A plastic which cannot be softened by heat is described as
Allotropes of an element differ in their
What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?
