Arrange the following in the order of property mentioned :
(i) `BaCl_2 , MgCl_2, BeCl_2 , CaCl_2` increasing ionic character
(ii) `Mg(OH)_2, Sr(OH)_2, Ba(OH)_2, Ca(OH)_2` increasing solubility in water
(iii) `BeO, MgO , BaO, CaO`
increasing basic character
(iv) `Mg(OH)_2, Ba(OH)_2, Ca(OH)_2` increasing basic character

Explanation

To solve the question, we will analyze each part step by step:

### (i) Increasing Ionic Character of `BaCl_2, MgCl_2, BeCl_2, CaCl_2`

1. **Understanding Ionic Character**: Ionic character increases with the size of the cation. Larger cations have lower ionization energy and can more easily form ions.
2. **Order of Cations**: The order of cations based on size (and thus ionic character) is: Be < Mg < Ca < Ba.
3. **Arranging the Compounds**: Therefore, the order of increasing ionic character for the chlorides is:
- BeCl₂ (least ionic character)
...