Question

The valency of iron in ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is

• A. $1$
• B. $2$
• C. $3$
• D. $6$

Answer 1

The correct option is C

$3$

Explanation for correct option

(C) $3$

Valency

• The combining power (or capacity) of an element is known as its valency.

Valency of iron in ${\mathrm{Fe}}_2{\mathrm{O}}_3$

The formula of ${\mathrm{Fe}}_2{\mathrm{O}}_3$can be derived as follows:-

$$\begin{gathered} \text{Symbol Fe O} \\ \text{Valency 3 2} \end{gathered}$$

• Crossover the valencies of the combining atoms, and we get the formula of iron (III) oxide is ${\mathrm{Fe}}_2{\mathrm{O}}_3$.
• So, the valency of iron in ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is $3$.

Explanation for incorrect option

The valency of iron in ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is $3$. Hence, options (A), (B), and (D) are incorrect.

Hence, option (C) is correct. The valency of iron in ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is $3$.