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Is Matter Around Us Pure ? — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure ?1 Mark
Question
Two substances, $A$ and $B$ were made to react to form a third substance, $A_2B$ according to the following reaction $2A + B \rightarrow A_2B$ Which of the following statements concerning this reaction are incorrect?
  1. The product $A_2B$ shows the properties of substances $A$ and $B.$
  2. The product will always have a fixed composition.
  3. The product so formed cannot be classified as a compound.
  4. The product so formed is an element.
✓

Answer

$(i), (iii)$ and $(iv)$
$A_2B$ is a compound made up of two elements $A$ and $B$ in a fixed ratio. The properties of a compound $($e.g., $A_2B)$ 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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