Which one of the following alkali metals gives hydrated salts?

Which one of the following is an alkali metal?

Which one of the following alkali metals is the most metallic?

Which one of the following alkali metals is the most metallic?

Which one of the following alkali metal ion posses maximum degree of hydration (A) Li^(+) (B) Na^(+) , c) K^(+) (D) Cs^(+)

Which of the following exists as hydrated salt-

Which of the following exists as hydrated salt-