S Block Elements Question 15

Question 15 - 31 January - Shift 2

The number of alkali metal(s), from $Li, K, Cs, Rb$ having ionization enthalpy greater than $400 kJ mol^{-1}$ and forming stable super oxide is___________

Show Answer

Answer: (2)

Solution:

Formula: Ionisation energy ,Reaction of alkali metals with $O_2$

$K, Rb$ and $Cs$ form stable super oxides but $Cs$ has ionisation enthalpy less than $400 kJ$.