JEE Main 2019 Chemistry question

Chemistry Thermodynamics JEE Main 2019

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

(A)Li > Na > K > Rb > CsCorrect
(B)Na > Li > K > Rb > Cs
(C)Li > Na > K > Cs > Rb
(D)Na > Li > K > Cs > Rb

Answer: (A)

Solution

Hydration enthalpy decreases with increasing ionic size.

Question ID VK-009242