Question

Which of the following options are correct?

• A. Valency of ferrous ion > Valency of ferric ion
• B. Valency of ferric ion > Valency of ferrous ion
• C. Valency of cupric ion > Valency of cuprous ion
• D. Valency of cuprous ion > Valency of cupric ion

Answer 1

Answer: (B), (C)

The correct options are
B

Valency of ferric ion > Valency of ferrous ion

C

Valency of cupric ion > Valency of cuprous ion

Certain elements exhibit more than one valency, i.e. they have variable valency.
So, if an element exhibits two different valencies: the suffix '-ous' is added to the ion exhibiting the lower one and the suffix '-ic' is added to ion exhibiting the higher one.
E.g.:

$Ferrous-F{e}^{2+}$ $Ferric-F{e}^{3+}$

$Cuprous-C{u}^{+}$ $Cupric-C{u}^{2+}$