Question

LiOH, KOH, NaOH, RbOH, COH
Increasing order of Alkaline character.
BeCO,, MgCO,, CaCO,, Sr CO,, BaCO
decreasing order of solubility
3​

Answer 1

Answer:

1. Increasing order of Alkaline character LiOH<KOH<NaOH<RbOH<CsOH (Due to increasing trend of size of atoms, ionisation energy decrease and consequently alkaline character of alkali metal hydroxide increase on moving down the group).
2. Solubility of carbonates of alkaline earth metals decreases as the atomic number of the metal increases down the group because the size of the cation increases down the group. We know that hydration energy and lattice energy are inversely proportional to the radii of the ions. Now, for carbonates, the decrease in hydration energy is much more than the decrease in lattice energy and so, their solubility decreases down the group.

The solubility of the carbonates follows the order:

Be>Mg>Ca>Sr>Ba

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