Question

Element x forms an oxide x2o3 . What is the valency of this element and formula of its chloride

Answer 1

We know the valency of Oxygen is 2.

Therefore for the chemical formula to be X2O3, the valency of X must be 3.

Therefore the formula of its chloride will be XCl3.

Answer 2

Answer: The valency of element is 3 and formula of its chloride is $XCL_3$

Explanation: The neutral oxide of the element X , $X_2O_3$ is formed by the combination of $X^{3+}$ and $O^{2-}$. Thus the valency of the element is X as it has lost three electrons to acquire stable noble gas configuration.

Similarly oxygen has gained two electrons to attain stable noble gas configuration and thus has a valency of two.

The chloride of the element X is formed by combination of $X^{3+}$ and $Cl^{-}$ and thus to form a neutral compound $XCl_3$ is formed.