Verified Solution • 2025–26 Session moderate

QJEEM19Ch3368: JEE Main 2019 Chemistry - Class 11 JEEM19Ch3368 Solution: The correct order of hydration enthapies of alkali metal ions…

The correct order of hydration enthapies of alkali metal ions is :

Multiple Choice Options

  • A Li+ > Na+ > Cs+ > Rb+
  • B Na+ > Li+ > K+ > Cs+ > Rb+
  • C Na+ > Li+ > K+ > Rb+ > Cs+
  • D Li+ > Na+ > K+ > Rb+ > Cs+

Step-by-Step Verified Solution

Hydration energy/enthalpy ∝ charg⁡esize

∴ Smaller the size more is hydration energy.

Li+ having minimum radius so maximum hydration energy.

Correct order is :

Li+ > Na+ > K+ > Rb+ > Cs+

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