Which of the following compound contains ionic as well as covalent bonds?

Options

A. `KCN`
B. `NaCl`
C. `H_2O_2`
D. `MgO`

Explanation

To determine which compound contains both ionic and covalent bonds, we can analyze the given options step by step.

### Step 1: Understand Ionic and Covalent Bonds
- **Ionic Bonds**: These bonds form between a metal and a non-metal, where the metal loses electrons to become a cation and the non-metal gains electrons to become an anion.
- **Covalent Bonds**: These bonds form between two non-metals where they share electrons due to a small difference in electronegativity.

### Step 2: Analyze the Given Compounds
We need to identify the compounds provided in the question (though they are not listed here, we will assume common examples).

1. **Potassium Cyanide (KCN)**:
- Potassium (K) is a metal and forms a cation (K⁺).
- Cyanide (CN⁻) is a polyatomic ion, which contains carbon and nitrogen.
- Within the cyanide ion, carbon and nitrogen share electrons, forming covalent bonds.
- Therefore, KCN contains both ionic (K⁺ and CN⁻) and covalent bonds (between C and N).

2. **Sodium Chloride (NaCl)**:
- Sodium (Na) is a metal and chlorine (Cl) is a non-metal.
- They form an ionic bond (Na⁺ and Cl⁻).
- This compound does not contain covalent bonds.

3. **Hydrogen Peroxide (H₂O₂)**:
- This compound consists of hydrogen and oxygen, both non-metals.
- They form covalent bonds by sharing electrons.
- There are no ionic bonds present.

4. **Magnesium Oxide (MgO)**:
- Magnesium (Mg) is a metal and oxygen (O) is a non-metal.
- They form an ionic bond (Mg²⁺ and O²⁻).
- This compound does not contain covalent bonds.

### Step 3: Conclusion
Among the compounds analyzed, **Potassium Cyanide (KCN)** is the only compound that contains both ionic and covalent bonds.

### Final Answer:
**The compound that contains both ionic and covalent bonds is Potassium Cyanide (KCN).**

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