Which of the following contains both covalent and ionic bonds?

Options

A. `C Cl_4`
B. `CaCl_2`
C. `NH_4 Cl`
D. `H_2 O`

Explanation

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

### Step 1: Understand Ionic and Covalent Bonds
- **Ionic Bonds**: These are formed when one atom donates electrons to another, typically occurring between metals and nonmetals.
- **Covalent Bonds**: These are formed by the sharing of electrons between two nonmetals.

### Step 2: Analyze Each Option
1. **CCl4 (Carbon Tetrachloride)**
- Carbon (C) and Chlorine (Cl) are both nonmetals.
- Therefore, CCl4 contains only covalent bonds.

**Conclusion**: CCl4 does not contain both types of bonds.

2. **Calcium Chloride (CaCl2)**
- Calcium (Ca) is a metal, and Chlorine (Cl) is a nonmetal.
- The bond formed between Ca and Cl is ionic.

**Conclusion**: Calcium Chloride contains only ionic bonds.

3. **Ammonium Chloride (NH4Cl)**
- Ammonium ion (NH4+) consists of nitrogen (N) and hydrogen (H), which are both nonmetals, forming covalent bonds.
- The bond between the ammonium ion and the chloride ion (Cl-) is ionic.

**Conclusion**: Ammonium Chloride contains both covalent and ionic bonds.

4. **Water (H2O)**
- Both Hydrogen (H) and Oxygen (O) are nonmetals.
- Therefore, water contains only covalent bonds.

**Conclusion**: Water does not contain both types of bonds.

### Final Conclusion
After analyzing all the options, we find that **Ammonium Chloride (NH4Cl)** is the only compound that contains both covalent and ionic bonds.

### Answer
The correct answer is **Ammonium Chloride (NH4Cl)**.

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