Two substances, A and B were made to react to form a third substance, `A_(2)B` according to the following reaction `2A+B to A_(2)B`.Which of the following statements concerning this reaction are incorrect?
(i) The product `A_(2)B` shows the properties of substances A and B.
(ii) The product will always have a fixed composition.
(iii) The product so formed cannot be classified as a compound.
(iv) The product so formed is an element.