MCQ
Two substances, $A$ and $B$ were made to react to form a third substance, $A_2 B$ according to the following reaction $2 A+$ $B \rightarrow A_2 B$ 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 $(iv)$
  • $(i), (iii)$ and $(iv)$
  • D
    $(ii), (iii)$ and $(iv)$

Answer

Correct option: 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.

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