Question

Look at the following reactions carried out in closed vessels:
(i) $PC{I}_5\to PC{I}_3+C{I}_2$
(ii)$N_2+O_2\to 2NO$
(iii) $2KCI{O}_3\to 2KCI+3O_2$
(iv) $F{e}^{3+}+SC{N}_{-}\to Fe(SCN{)}^{2+}$
Which one of them is irreversible?

• A. $\left(i\right)$
• B. $\left(ii\right)$
• C. $\left(iii\right)$
• D. $\left(iv\right)$

Answer 1

The correct option is D $\left(iv\right)$

$F{e}^{3+}+SC{N}^{-}⟶\underset{\text{Red blood colour}}{Fe(SCN{)}^{2+}}$

This reaction is irreversible.