Understanding the Reaction 2A + B → A2B

Exploring the Incorrect Statements in the Reaction

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)

Final answer:

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.

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.