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Atoms and Molecules — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceAtoms and Molecules3 Marks
Question
An element A forms an oxide $A_2O_5.$
  1. What is the valency of element $A$?
  2. What will be the formula of chloride of $A$?
✓

Answer

  1. Element A forms an oxide $A_2O_5$​​​​​​​. Crossing the valencies, we can see that the valency of O(oxide) is $-2$ and that of element $A$ is $5$.
  2. Formula of chloride of $A$:
$\text{Element/ Ion}\ \ \ \ \ \ \ \text{A}\ \ \ \ \ \ \text{Cl}^-\\ \ \ \ \text{Valency}\ \ \ \ \ \ \ \ \ \ \ \ \ \ 5\ \ \ \ -1$
Formula of the chlcride of element A can be worked out by crossing over the valencies. Thus, the formula is $ACl_5$

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