How many of the following have more hydration energy than `K^+` ion ?
[`Li^+ , Na^+ , Rb^+ , Cs^+ , Be^(2+), Mg^(2+), Ca^(2+), Sr^(2+), Ba^(2+)` ]

The hydration energy of Mg^(2+) is-

How many of the following ions produce colour in the bunsen flame when introduced directly or as a mixture with other substance. K^(+) , Rb^(+) , Cs^(+) , Be^(2+) , Mg^(2+) , Ca^(2+) , Sr^(2+) , Ba^(2+) , Zn^(2+) , BO_(3)^(3-)

How many of the following gives color to the flame test Li,Be,Na,Mg,Ca,Sr,Ba,K,Rb,Cs

Which one is having high hydration energy? (a) K^(o+) (b) Li^(o+) (c ) Na^(o+) (e) Cs^(o+) .

Which of the following alkali metals is most electropositive ? Li, Na, K , Rb or Cs .