Question

An element $A$ combines with oxygen to form an oxide $AO$. The oxide is electrically conducting. Find the formula of the compound when $A$ reacts with chlorine.

• A. $ACl$
• B. $A{Cl}_2$
• C. $A{Cl}_3$
• D. $A_2{Cl}^{}$

Answer 1

Answer: (B)

$A{Cl}_2$

$\because AO\Rightarrow A^{+2}+O^{-2}$
$\therefore A^{+2}+2Cl-⟶AC{l}_2$
Hence, the correct option is B.