Question

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.

• A. (i), (ii) and (iii)
• B. (ii), (iii) and (iv)
• C. (i), (iii) and (iv)
• D. (ii), (iii) and (iv)

Answer 1

The correct option is C (i), (iii) and (iv)

$A_{2}B$ is a compound made up of two elements A and B in a fixed ratio. The properties of a compound (e.g., $A_{2}B$) are entirely different from those of its constituent elements (i.e., A and B). The composition of a compound is fixed.