Question

An element $A$ is tetravalent and another element $B$ is divalent. The formula of the compound formed by the combination of these elements is:

• A. $A_{2}B$
• B. $AB$
• C. $A{B}_2$
• D. $A_2{B}_3$

Answer 1

Answer: (C)

$A{B}_2$

Valency of $A$ is 4. Valency of $B$ is 2.
$A⟶4$
$\times$
$B⟶2$
$\left(Crossmultiply\right)$

$A_2{B}_4⟹A{B}_2$

Compound formed by the combination of $A$ and $B$ is $A{B}_2$.
Example :- $C{O}_2$ (Carbon dioxide).

Hence, the correct option is $\text{C}$