Select correct order out of given options :-

Options

A. `BeCO_(3)ltBaCO_(3)to` Covalent character
B. `BeOgtSrOto` Lattice anergy
C. `Be^(2+)ltLi^(+)to` Hydration energy
D. `Be_((aq.))^(2+)gtLi_((aq.))^(+)to` Ionic Mobility

Answer

To solve the question regarding the correct order of properties among the given options, we will analyze each option step by step.

### Step 1: Analyze Option A
**Statement:** Beryllium carbonate (BeCO3) has less covalent character than barium carbonate (BaCO3).

**Analysis:**
- As we move down Group 2 in the periodic table, the ionic character of the compounds generally increases due to the increase in atomic size.
- Beryllium (Be) is smaller and has a higher charge density compared to barium (Ba), which leads to more covalent character in BeCO3 than in BaCO3.
- Therefore, this statement is **false**.

### Step 2: Analyze Option B
**Statement:** Beryllium oxide (BeO) has a higher lattice energy than strontium oxide (SrO).

**Analysis:**
- Lattice energy is influenced by the size of the ions; smaller ions lead to higher lattice energy due to stronger electrostatic forces.
- Beryllium is smaller than strontium, and thus BeO will have a higher lattice energy compared to SrO.
- Therefore, this statement is **true**.

### Step 3: Analyze Option C
**Statement:** Hydration energy of Be2+ is less than that of Li+.

**Analysis:**
- Hydration energy is influenced by the charge and size of the ion. Beryllium (Be2+) has a higher effective nuclear charge than lithium (Li+), leading to a stronger attraction of water molecules.
- Therefore, Be2+ has a higher hydration energy than Li+, making this statement **false**.

### Step 4: Analyze Option D
**Statement:** Ionic mobility of Be2+ is more than that of Li+.

**Analysis:**
- Ionic mobility is inversely related to the size of the ion and its hydration energy. Since Be2+ is smaller and has a higher hydration energy, it will be more surrounded by water molecules and thus less mobile compared to Li+.
- Therefore, this statement is **false**.

### Conclusion
From the analysis:
- Option A: False
- Option B: True
- Option C: False
- Option D: False

Thus, the correct order is given by **Option B**.