Chemistry - Complete s-block Question with Solution | TestHub
How many of the following are correctly matched :
Hydration energy: Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺
Mobility of ions (aq): Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺
Density: Li < Na < K < Rb < Cs
Reaction with N₂: Li < Na < Rb < Cs < K
Reducing nature of gas phase: Li < Na < K < Rb < Cs
Reducing nature in aq. phase: Li > Na > K > Rb > Cs
Answer:
Solution:
Hydration energy: is correct because smaller ions have a higher charge density and attract more water molecules.
Reducing nature (gas phase): is correct because ionization energy decreases down the group, making it easier to lose electrons in the gaseous state.
Incorrect statements: Ionic mobility in water is reversed () due to hydration size; Potassium () is less dense than Sodium (); and only Lithium reacts directly with .
