Question

Two substances, A and B, were made to react to form a third substance, A2B, according to the following reaction (2A + B → A2B). Which of the following statements concerning this reaction are incorrect?

(i) The product A2B 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 1

The incorrect statements about the reaction 2A + B to form A2B are that the product shows the properties of A and B, cannot be classified as a compound, and is an element.

Step-by-step explanation:

The question concerns the reaction 2A + B → A2B, and which statements about this reaction are incorrect. The substances A and B react to form the compound A2B. By definition, a compound is a substance formed when two or more elements combine in a fixed composition. Therefore, statement (i) that the product A2B shows the properties of substances A and B is incorrect because a compound typically has different properties than its constituent elements. Statement (ii) is correct because compounds have a fixed composition. Statement (iii) is incorrect as the product formed is a compound, not a non-compound substance. Lastly, statement (iv) is incorrect since the product is a compound, not an element.

The correct choice is therefore C. (i), (iii), and (iv) which identify the incorrect statements concerning the reaction.