Which one of the following contains both ionic and covalent bonds?

Options

A. `CH_(4)`
B. `NaOH`
C. `KCl`
D. `SO_(2)`

Answer

To determine which of the given compounds contains both ionic and covalent bonds, let's analyze each option step by step.

### Step 1: Analyze CH4 (Methane)
- **Structure**: CH4 consists of one carbon atom covalently bonded to four hydrogen atoms.
- **Bond Type**: All bonds in CH4 are covalent.
- **Conclusion**: CH4 does not contain ionic bonds.

**Hint**: Look for the types of bonds present in the molecule. Covalent bonds involve sharing of electrons, while ionic bonds involve transfer of electrons.

### Step 2: Analyze NaOH (Sodium Hydroxide)
- **Structure**: NaOH consists of Na⁺ (sodium ion) and OH⁻ (hydroxide ion).
- **Bond Type**: The bond between Na⁺ and OH⁻ is ionic due to the electrostatic attraction between the positively charged sodium ion and the negatively charged hydroxide ion. The bond between O and H in OH is covalent.
- **Conclusion**: NaOH contains both ionic and covalent bonds.

**Hint**: Identify the ions present in the compound to determine if there is an ionic bond, and check for covalent bonds within polyatomic ions.

### Step 3: Analyze KCl (Potassium Chloride)
- **Structure**: KCl consists of K⁺ (potassium ion) and Cl⁻ (chloride ion).
- **Bond Type**: The bond between K⁺ and Cl⁻ is ionic.
- **Conclusion**: KCl does not contain covalent bonds.

**Hint**: Similar to NaOH, check if the compound consists of ions. If it only has ionic bonds, it does not meet the criteria.

### Step 4: Analyze SO2 (Sulfur Dioxide)
- **Structure**: SO2 consists of one sulfur atom double bonded to two oxygen atoms.
- **Bond Type**: All bonds in SO2 are covalent.
- **Conclusion**: SO2 does not contain ionic bonds.

**Hint**: Look for the presence of multiple bonds (like double bonds) and the types of atoms involved to determine if they are covalent.

### Final Conclusion
After analyzing all options:
- **CH4**: Only covalent bonds.
- **NaOH**: Contains both ionic and covalent bonds (Correct answer).
- **KCl**: Only ionic bonds.
- **SO2**: Only covalent bonds.

Thus, the correct answer is **NaOH**.