Question

The correct order of hydration enthapies of alkali metal ions is ______.

विकल्प

• Li⁺ > Na⁺ > Cs⁺ > Rb⁺

• Na⁺ > Li⁺ > K⁺ > Rb⁺ > Cs⁺

• Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺

• Na⁺ > Li⁺ > K⁺ > Cs⁺ > Rb⁺

Answer 1

The correct order of hydration enthapies of alkali metal ions is Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺.

Explanation:

H.E `prop "Charge"/"Size"`

Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺ 

L → R charge = const. size ↓ ∴ HE ↓