Which of the following sequences is incorrect with respect to the property indicated?

Oxidising power:

F_{2} > C l_{2} > B r_{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Bond energy:

C l_{2} > B r_{2} > F_{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Ionic radius:

F^{-} > O^{2 -} > H^{-}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Electron affinity:

S > S e > O

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C Ionic radius: $F^{-} > O^{2 -} > H^{-}$
a) Standard reduction potential of halogens are positive and decrease down the group. The oxidising power also decreases down the group.
b) Generally bond energy decreases down the group as the size increases but in $F_{2}$ , interelectronic repulsion is very high, it has a lower bond energy as compared to $C l_{2}$ , $B r_{2}$ .
c) Ionic radius increases with an increase in the negative charge. So, $F^{-}$ should have a lower ionic radius compared to $O^{2 -}$ .
d) Electron affinity of $O$ is lower than $S$ and $S e$ because of a high interelectronic repulsion in $O$ .

Suggest Corrections