JEE Main202329 Jan 2023Morning ShiftChemistrys Block ElementsActual
The correct order of hydration enthalpies is (A) K + (B) Rb + (C) Mg 2 + (D) Cs + (E) Ca 2 + Choose the correct answer from the options given below:
Options
- AC > A > E > B > D
- BE > C > A > B > D
- CC > E > A > D > B
- DC > E > A > B > D
Correct answer
D. C > E > A > B > D
Step-by-step solution
The hydration enthalpy of alkali metal ions decreases with an increase in ionic sizes. So, the order is: Li +   >   Na +   >     K +   >   Rb +   >   Cs + Like alkali metal ions, the hydration enthalpies of alkaline earth metal ions decrease with an increase in ionic size down the group. So, the order is: Be 2 +   >   Mg 2 +   >   Ca 2 +   >   Sr 2 +   >   Ba 2 + The hydration enthalpies of alkaline