Question

One word answers are given for the following. Mark the example which is not correct.

• A. Alkali metal with lowest melting point - Cs
• B. Alkaline earth metal with highest hydration enthalpy - $Ba^{2 +}$
• C. Alkaline earth metal which imparts brick red colour to the flame - $Ca^{2 +}$
• D. Oxide of alkaline earth metal which is amphoteric in nature – BeO

Answer 1

Answer: (B)

Alkaline earth metal with highest hydration enthalpy - $Ba^{2 +}$

Answer 2

: Hydration enthalpy decreases with increase in ionic

size down the group.

$Be^{2 +} > Mg^{2 +} > Ca^{2 +} > Sr^{2 +} > Ba^{2 +}$