question_answer 29)

  Two substances, A and B were made to react to form a third substance, according to the following reaction . Which of the following statements concerning this reaction are incorrect? (i) The product  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. (a) (i), (ii) and (iii)             (b) (ii), (iii) and (iv)           (c) (i), (iii) and (iv)            (d) (ii), (iii) and (iv)

Answer:

  (c)  is a compound made up of two elements A and B in a fixed ratio. The properties of a compound (e.g., A2B) are entirely different from those of its constituent elements (e.g., A and B). The composition of a compound is fixed.