Which of the following is arranged according to increasing basic strength?

Options

A. `CaO lt MgO lt lt SrO lt BaO lt BeO`
B. `BaO ltSrO lt CaO lt MgO lt BeO`
C. `BeO lt MgO lt CaO lt BaO lt SrO`
D. `BeO lt MgO lt CaO lt SrO lt BaO`

Explanation

To determine the arrangement of the alkaline earth metal oxides according to increasing basic strength, we need to consider the trend in basicity as we move down the group in the periodic table. Here's a step-by-step solution:

### Step 1: Understand the trend in basic strength
- Basic strength of alkaline earth metal oxides increases as we move down the group. This is due to the increase in atomic size, which leads to a decrease in the force of attraction between the nucleus and the valence electrons.

### Step 2: Identify the alkaline earth metal oxides
- The alkaline earth metal oxides we are considering are:
- Beryllium oxide (BeO)
- Magnesium oxide (MgO)
- Calcium oxide (CaO)
- Strontium oxide (SrO)
- Barium oxide (BaO)

### Step 3: Arrange the oxides according to their basic strength
- Based on the trend that basic strength increases down the group, we can arrange the oxides as follows:
1. BeO (least basic)
2. MgO
3. CaO
4. SrO
5. BaO (most basic)

### Step 4: Conclusion
- Therefore, the correct order of increasing basic strength is:
**BeO < MgO < CaO < SrO < BaO**

### Final Answer
- The arrangement according to increasing basic strength is: **BeO < MgO < CaO < SrO < BaO**.

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