Which of the properties are INCORRECT regarding `NaHCO_(3)` and `KHCO_(3)`

Options

A. Both are fairly soluble in water
B. Both have similar structure of `HCO_(3)^(-)` ion in their solid
C. Both solid consists of ion-dipole type of interaction
D. Both on heating produces respective carbonate as residue

Answer

To determine which properties are incorrect regarding NaHCO₃ (sodium bicarbonate) and KHCO₃ (potassium bicarbonate), we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Analyze the Solubility of NaHCO₃ and KHCO₃:**
- **Statement:** "Both are fairly soluble in water."
- **Analysis:** NaHCO₃ is less soluble in water compared to KHCO₃, which is completely soluble. Therefore, this statement is incorrect.

2. **Examine the Structure of HCO₃⁻ Ion in Solid State:**
- **Statement:** "Both have similar structure of HCO₃⁻ ion in their solid."
- **Analysis:** The crystal structure of NaHCO₃ is monoclinic, while KHCO₃ has a slightly different structure. Thus, this statement is also incorrect.

3. **Evaluate Ion-Dipole Interactions:**
- **Statement:** "Both solids consist of ion-dipole type of interaction."
- **Analysis:** Both NaHCO₃ and KHCO₃ exhibit ion-dipole interactions due to the presence of cations (Na⁺ and K⁺) and the bicarbonate ion (HCO₃⁻). This statement is correct.

4. **Consider the Products of Heating:**
- **Statement:** "Both on heating produce respective carbonate as residue."
- **Analysis:** Upon heating, NaHCO₃ decomposes to form Na₂CO₃, CO₂, and H₂O, while KHCO₃ decomposes to form K₂CO₃, CO₂, and H₂O. This statement is also correct.

### Conclusion:
The incorrect statements regarding NaHCO₃ and KHCO₃ are:
- Both are fairly soluble in water.
- Both have similar structure of HCO₃⁻ ion in their solid.

### Final Answer:
The incorrect properties are:
1. Both are fairly soluble in water.
2. Both have similar structure of HCO₃⁻ ion in their solid.

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