Regarding alkali metal ions which is incorrect?

The alkali metal ion which has maximum Ionic mobility in aqueous solution is

The alkali metal ion which has maximum Ionic mobility in aqueous solution is

Which of the following statement regarding difference between lithium and other alkali metals is incorrect ?

Which one of the following statements regarding the oxides of alkali and alkaline earth metals is not correct ?

Which one of the following statements regarding the oxides of alkali and alkaline earth metals is not correct ?

(A): The lattice energy of superoxide of alkali metals increases with an increase in the size of the metal ion (R) : Lattice energy is directly proportional to size of the metal ion

Which of the following statements regarding the oxides of alkali and alkaline earth metals is correct?