Which given order is wrong according to given property :-

Options

A. `K_(2)OgtCaO` basic nature
B. `NH_(3)gtH_(2)O` basic nature
C. `BH_(3)gtNH_(3)` Acidic nature
D. `KHgtNaH` acidic nature

Answer

To determine which order is wrong according to the given property, we need to analyze each option based on the basicity and acidity of the compounds mentioned.

### Step-by-Step Solution:

1. **Understanding Basicity and Acidity**:
- Basicity refers to the ability of a substance to donate electrons or accept protons.
- Acidity refers to the ability of a substance to accept electrons or donate protons.

2. **Analyzing Option A: Potassium Oxide vs. Calcium Oxide**:
- Potassium (K) is in Group 1 and Calcium (Ca) is in Group 2 of the periodic table.
- Basicity increases down the group. Therefore, K2O (Potassium Oxide) should be more basic than CaO (Calcium Oxide).
- **Conclusion**: Option A is correct.

3. **Analyzing Option B: Ammonia vs. Water**:
- Ammonia (NH3) contains nitrogen from Group 15, while water (H2O) contains oxygen from Group 16.
- Ammonia is more basic than water because nitrogen has a lower electronegativity than oxygen, allowing it to donate its lone pair more readily.
- **Conclusion**: Option B is correct.

4. **Analyzing Option C: BH3 vs. NH3**:
- Boron (B) is in Group 13 and nitrogen (N) is in Group 15.
- As we move across the period, the acidic character decreases. Therefore, NH3 (Ammonia) is less acidic than BH3 (Boron Hydride).
- **Conclusion**: Option C is correct.

5. **Analyzing Option D: KH vs. NaH**:
- Potassium (K) and Sodium (Na) are both in Group 1.
- As we move down the group, the acidic character decreases. Therefore, KH (Potassium Hydride) should be less acidic than NaH (Sodium Hydride).
- **Conclusion**: Option D is incorrect because it states that KH is more acidic than NaH, which contradicts the trend.

### Final Answer:
The wrong order according to the given property is **Option D: KH is more acidic than NaH**.

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