Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

The correct order of hydration enthalpies of alkali metal ions is

  1. A

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

  2. B

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

  3. C

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

  4. D

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

Solution

Smaller is size more is hydration energy.

Li+ < Na+ < K+ < Rb+ < Cs+ Size

Li+ > Na+ > K+ > Rb+ > Cs+ Hydration energy.

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