Question

In moist air, iron is oxidized to give:

• A. iron$\left[II\right]$ oxide
• B. iron$\left[III\right]$ oxide
• C. iron$\left[II\right]$ hydroxide
• D. iron$\left[II\right]$ sulphide

Answer 1

The correct option is B iron$\left[III\right]$ oxide

When iron is subjected to moist air it is oxidised as per the following reactions:

$Fe\to F{e}^{2+}+2e^{-};$ Oxidation takes place

In the presence of moisture the following reaction takes place:

$2F{e}^{2+}+2H_{2}O+\frac{1}{2}{O}_2\to F{e}_2{O}_3+4H^{+}$

In $F{e}_2{O}_3$ iron is in $+3$ oxidation state.

Hence option B is correct.