Question

Iron exhibits the valency of

• A. ${}^{+}1$
• B. ${}^{+}2$
• C. ${}^{+}3$
• D. ${}^{+}2$ and ${}^{+}3$

Answer 1

The correct option is D

${}^{+}2$ and ${}^{+}3$

Explanation for correct option:

• Some metals like iron (Fe), copper (Cu), mercury (Hg) etc. form two types of ions having different charges or valencies.
• Iron forms two ions, ${\mathrm{Fe}}^{2+}$ (valency $+2$ ) and ${\mathrm{Fe}}^{3+}$ (valency$+3$ ).
• These are named as :

${\mathrm{Fe}}^{2+}$: Iron (II) ion or ferrous ion.

${\mathrm{Fe}}^{3+}$: Iron (III) ion or ferric ion.

Hence, option (d) is correct.