Find incorrect comparison of second ionisation energy
$Te < Sb$
$In > Sr$
$He > B$
$Fe < Fe^+$
In a reaction the ferrous $(F{e^{ + 2 }})$ iron is oxidised to ferric $(F{e^{ + 3 }})$ ion. The equivalent weight of the ion in the above reaction is equal to
Which of the following is a colourless ion
Iron becomes passive by ..................... due to formation of .....................
The transition metal having highest $3^{\text {rd }}$ ionisation enthalpy is :
Transition metals are often paramagnetic owing to